The configuration examples in this document were created and verified in a lab environment, and all the devices were started with the factory default configuration. When you are working on a live network, make sure you understand the potential impact of every command on your network.

This document assumes that you have basic knowledge of NTP.

Example: Configuring the NTP client/server mode

Network configuration

As shown in Figure 1, configure the NTP client/server mode so all devices can be synchronized to Device A, the NTP server.

Figure 1 Network diagram

Applicable hardware and software versions

The following matrix shows the hardware and software versions to which this configuration example is applicable:

Hardware	Software version
S6812 switch series S6813 switch series	Release 6615Pxx, Release 6628Pxx
S6550XE-HI switch series	Release 6008 and later, Release 8106Pxx
S6525XE-HI switch series	Release 6008 and later, Release 8106Pxx
S5850 switch series	Release 8005 and later
S5570S-EI switch series	Release 11xx
S5560X-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5560X-HI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5500V2-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-30F	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-30C MS4520V2-54C	Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-28S MS4520V2-24TP	Release 63xx
ES5500 switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S6520X-HI switch series S6520X-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S6520X-SI switch series S6520-SI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5000-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4600 switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5560S-EI switch series S5560S-SI switch series	Release 63xx
S5500V3-24P-SI S5500V3-48P-SI	Release 63xx
S5500V3-SI switch series (except the S5500V3-24P-SI and S5500V3-48P-SI)	Release 11xx
S5170-EI switch series	Release 11xx
S5130S-HI switch series S5130S-EI switch series S5130S-SI switch series S5130S-LI switch series	Release 63xx
S5120V2-SI switch series S5120V2-LI switch series	Release 63xx
S5120V3-EI switch series	Release 11xx
S5120V3-36F-SI S5120V3-28P-HPWR-SI S5120V3-54P-PWR-SI	Release 11xx
S5120V3-SI switch serie (except the S5120V3-36F-SI, S5120V3-28P-HPWR-SI, and S5120V3-54P-PWR-SI)	Release 63xx
S5120V3-LI switch series	Release 63xx
S3600V3-EI switch series	Release 11xx
S3600V3-SI switch series	Release 11xx
S3100V3-EI switch series S3100V3-SI switch series	Release 63xx
S5110V2 switch series	Release 63xx
S5110V2-SI switch series	Release 63xx
S5000V3-EI switch series S5000V5-EI switch series	Release 63xx
S5000E-X switch series S5000X-EI switch series	Release 63xx
E128C E152C E500C switch series E500D switch series	Release 63xx
MS4320V2 switch series MS4320V3 switch series MS4300V2 switch series MS4320 switch series MS4200 switch series	Release 63xx
WS5850-WiNet switch series	Release 63xx
WS5820-WiNet switch series WS5810-WiNet switch series	Release 63xx
WAS6000 switch series	Release 63xx
IE4300-12P-AC & IE4300-12P-PWR IE4300-M switch series IE4320 switch series	Release 63xx

Procedures

Configuring Device A

# Assign an IP address to VLAN-interface 2.

<DeviceA> system-view

[DeviceA] interface Vlan-interface 2

[DeviceA-Vlan-interface2] ip address 1.0.1.11 24

[DeviceA-Vlan-interface2] quit

# Enable the NTP service.

[DeviceA] ntp-service enable

# Specify the local clock as the reference source, with the stratum level 2.

[DeviceA] ntp-service refclock-master 2

Configuring Device B

# Assign an IP address to VLAN-interface 2. (Details not shown.)

# Enable the NTP service.

<DeviceB> system-view

[DeviceB] ntp-service enable

# Specify Device A as the NTP server of Device B so that Device B is synchronized to Device A.

[DeviceB] ntp-service unicast-server 1.0.1.11

Configuring Device C

# Assign an IP address to VLAN-interface 2. (Details not shown.)

# Enable the NTP service.

<DeviceC> system-view

[DeviceC] ntp-service enable

# Specify Device A as the NTP server of Device C so that Device C is synchronized to Device A.

[DeviceC] ntp-service unicast-server 1.0.1.11

Verifying the configuration

# Verify that Device B has synchronized to Device A, and the clock stratum level is 3 on Device B and 2 on Device A.

[DeviceB] display ntp-service status

Clock status: synchronized

Clock stratum: 3

System peer: 1.0.1.11

Local mode: client

Reference clock ID: 1.0.1.11

Leap indicator: 00

Clock jitter: 0.003479 s

Stability: 0.000 pps

Clock precision: 2^-19

Root delay: 1.95313 ms

Root dispersion: 28.38135 ms

Reference time: d5ed8cd5.577006ea Wed, Sep 25 2019 16:24:53.341

System poll interval: 64 s

# Verify that an IPv4 NTP association has been established between Device B and Device A.

[DeviceB] display ntp-service sessions

source reference stra reach poll now offset delay disper

********************************************************************************

[12345]1.0.1.11 127.127.1.0 2 255 64 38 -10.22 1.9531 3.3416

Notes: 1 source(master), 2 source(peer), 3 selected, 4 candidate, 5 configured.

Total sessions: 1

NOTE:

· For the S6550XE-HI switch series and the S6525XE-HI switch series, the value is 2^-21 for the Clock precision field in the output from the display ntp-service status command.

· For the S6812 switch series, S6813 switch series, and S5850 switch series, the value is 2^-23 for the Clock precision field in the output from the display ntp-service status command.

· For the S5170-EI switch series and S5570S-EI switch series, the value is 2^-18 for the Clock precision field in the output from the display ntp-service status command.

Configuration files

· Device A:

interface Vlan-interface2

ip address 1.0.1.11 255.255.255.0

ntp-service enable

ntp-service refclock-master 2

· Device B:

interface Vlan-interface2

ip address 1.0.1.12 255.255.255.0

ntp-service enable

ntp-service unicast-server 1.0.1.11

· Device C:

interface Vlan-interface2

ip address 1.0.1.13 255.255.255.0

ntp-service enable

ntp-service unicast-server 1.0.1.11

Example: Configuring the NTP broadcast mode

Network configuration

As shown in Figure 2, configure the NTP broadcast mode so all devices on the same network segment can be synchronized to Device C, the NTP server.

Figure 2 Network diagram

Applicable hardware and software versions

The following matrix shows the hardware and software versions to which this configuration example is applicable:

Hardware	Software version
S6812 switch series S6813 switch series	Release 6615Pxx, Release 6628Pxx
S6550XE-HI switch series	Release 6008 and later, Release 8106Pxx
S6525XE-HI switch series	Release 6008 and later, Release 8106Pxx
S5850 switch series	Release 8005 and later
S5570S-EI switch series	Release 11xx
S5560X-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5560X-HI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5500V2-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-30F	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-30C MS4520V2-54C	Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-28S MS4520V2-24TP	Release 63xx
ES5500 switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S6520X-HI switch series S6520X-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S6520X-SI switch series S6520-SI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5000-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4600 switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5560S-EI switch series S5560S-SI switch series	Release 63xx
S5500V3-24P-SI S5500V3-48P-SI	Release 63xx
S5500V3-SI switch series (except the S5500V3-24P-SI and S5500V3-48P-SI)	Release 11xx
S5170-EI switch series	Release 11xx
S5130S-HI switch series S5130S-EI switch series S5130S-SI switch series S5130S-LI switch series	Release 63xx
S5120V2-SI switch series S5120V2-LI switch series	Release 63xx
S5120V3-EI switch series	Release 11xx
S5120V3-36F-SI S5120V3-28P-HPWR-SI S5120V3-54P-PWR-SI	Release 11xx
S5120V3-SI switch series (except the S5120V3-36F-SI, S5120V3-28P-HPWR-SI, and S5120V3-54P-PWR-SI)	Release 63xx
S5120V3-LI switch series	Release 63xx
S3600V3-EI switch series	Release 11xx
S3600V3-SI switch series	Release 11xx
S3100V3-EI switch series S3100V3-SI switch series	Release 63xx
S5110V2 switch series	Release 63xx
S5110V2-SI switch series	Release 63xx
S5000V3-EI switch series S5000V5-EI switch series	Release 63xx
S5000E-X switch series S5000X-EI switch series	Release 63xx
E128C E152C E500C switch series E500D switch series	Release 63xx
MS4320V2 switch series MS4320V3 switch series MS4300V2 switch series MS4320 switch series MS4200 switch series	Release 63xx
WS5850-WiNet switch series	Release 63xx
WS5820-WiNet switch series WS5810-WiNet switch series	Release 63xx
WAS6000 switch series	Release 63xx
IE4300-12P-AC & IE4300-12P-PWR IE4300-M switch series IE4320 switch series	Release 63xx

Procedures

Configuring Device C

# Enable the NTP service.

<DeviceC> system-view

[DeviceC] ntp-service enable

# Specify the local clock as the reference source, with the stratum level 2.

[DeviceC] ntp-service refclock-master 2

# Assign an IP address to VLAN-interface 2.

[DeviceC] interface Vlan-interface 2

[DeviceC-Vlan-interface2] ip address 3.0.1.31 24

# Configure Device C to operate in broadcast server mode and send broadcast messages from VLAN-interface 2.

[DeviceC-Vlan-interface2] ntp-service broadcast-server

Configuring Device A, Device B, Device D, and Device E

# Assign an IP address to VLAN-interface 2. (Details not shown.)

# Enable the NTP service.

<DeviceA> system-view

[DeviceA] ntp-service enable

# Configure Device A to operate in broadcast client mode and receive broadcast messages on VLAN-interface 2.

[DeviceA-Vlan-interface2] ntp-service broadcast-client

# Configure Device B, Device D, and Device E in the same way Device A is configured. (Details not shown.)

Verifying the configuration

# Verify that Device A has synchronized to Device C, and the clock stratum level is 3 on Device A and 2 on Device C.

[DeviceA-Vlan-interface2] display ntp-service status

Clock status: synchronized

Clock stratum: 3

System peer: 3.0.1.31

Local mode: bclient

Reference clock ID: 3.0.1.31

Leap indicator: 00

Clock jitter: 0.000061 s

Stability: 0.000 pps

Clock precision: 2^-19

Root delay: 0.00000 ms

Root dispersion: 7951.43127 ms

Reference time: d5ee8d88.2faabed0 Thu, Sep 26 2019 10:40:08.186

System poll interval: 64 s

# Verify that an IPv4 NTP association has been established between Device A and Device C.

[DeviceA-Vlan-interface2] display ntp-service sessions

source reference stra reach poll now offset delay disper

********************************************************************************

[1234]3.0.1.31 127.127.1.0 2 254 64 82 -2.190 0.0000 7937.5

Notes: 1 source(master), 2 source(peer), 3 selected, 4 candidate, 5 configured.

Total sessions: 1

NOTE:

· For the S6550XE-HI switch series and the S6525XE-HI switch series, the value is 2^-21 for the Clock precision field in the output from the display ntp-service status command.

· For the S6812 switch series, S6813 switch series, and S5850 switch series, the value is 2^-23 for the Clock precision field in the output from the display ntp-service status command.

· For the S5170-EI switch series and S5570S-EI switch series, the value is 2^-18 for the Clock precision field in the output from the display ntp-service status command.

Configuration files

· Device C:

interface Vlan-interface2

ip address 3.0.1.31 255.255.255.0

ntp-service broadcast-server

ntp-service enable

ntp-service refclock-master 2

· Device A:

interface Vlan-interface2

ip address 3.0.1.33 255.255.255.0

ntp-service broadcast-client

ntp-service enable

· Device B:

interface Vlan-interface2

ip address 3.0.1.30 255.255.255.0

ntp-service broadcast-client

ntp-service enable

· Device D:

interface Vlan-interface2

ip address 3.0.1.32 255.255.255.0

ntp-service broadcast-client

ntp-service enable

· Device E:

interface Vlan-interface2

ip address 3.0.1.34 255.255.255.0

ntp-service broadcast-client

ntp-service enable

Example: Configuring the NTP multicast mode

Network configuration

As shown in Figure 3, configure the NTP multicast mode so all devices on different network segments can be synchronized to Device C, the NTP server.

Figure 3 Network diagram

Applicable hardware and software versions

The following matrix shows the hardware and software versions to which this configuration example is applicable:

Hardware	Software version
S6812 switch series S6813 switch series	Release 6615Pxx, Release 6628Pxx
S6550XE-HI switch series	Release 6008 and later, Release 8106Pxx
S6525XE-HI switch series	Release 6008 and later, Release 8106Pxx
S5850 switch series	Release 8005 and later
S5570S-EI switch series	Release 11xx
S5560X-EI switch series	Release 63xx, Release 65xx, and Release 6615Pxx, Release 6628Pxx
S5560X-HI switch series	Release 63xx, Release 65xx, and Release 6615Pxx, Release 6628Pxx
S5500V2-EI switch series	Release 63xx, Release 65xx, and Release 6615Pxx, Release 6628Pxx
MS4520V2-30F	Release 63xx, Release 65xx, and Release 6615Pxx, Release 6628Pxx
MS4520V2-30C MS4520V2-54C	Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-28S MS4520V2-24TP	Release 63xx
ES5500 switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S6520X-HI switch series S6520X-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S6520X-SI switch series S6520-SI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5000-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4600 switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5560S-EI switch series S5560S-SI switch series	Release 63xx
S5500V3-24P-SI S5500V3-48P-SI	Release 63xx
S5500V3-SI switch series (except the S5500V3-24P-SI and S5500V3-48P-SI)	Release 11xx
S5170-EI switch series	Release 11xx
S5130S-HI switch series S5130S-EI switch series S5130S-SI switch series S5130S-LI switch series	Release 63xx
S5120V2-SI switch series S5120V2-LI switch series	Release 63xx
S5120V3-EI switch series	Release 11xx
S5120V3-36F-SI S5120V3-28P-HPWR-SI S5120V3-54P-PWR-SI	Release 11xx
S5120V3-SI switch series (except the S5120V3-36F-SI, S5120V3-28P-HPWR-SI, and S5120V3-54P-PWR-SI)	Release 63xx
S5120V3-LI switch series	Release 63xx
S3600V3-EI switch series	Release 11xx
S3600V3-SI switch series	Release 11xx
S3100V3-EI switch series S3100V3-SI switch series	Release 63xx
S5110V2 switch series	Release 63xx
S5110V2-SI switch series	Release 63xx
S5000V3-EI switch series S5000V5-EI switch series	Release 63xx
S5000E-X switch series S5000X-EI switch series	Release 63xx
E128C E152C E500C switch series E500D switch series	Release 63xx
MS4320V2 switch series MS4320V3 switch series MS4300V2 switch series MS4320 switch series MS4200 switch series	Release 63xx
WS5850-WiNet switch series	Release 63xx
WS5820-WiNet switch series WS5810-WiNet switch series	Release 63xx
WAS6000 switch series	Release 63xx
IE4300-12P-AC & IE4300-12P-PWR IE4300-M switch series IE4320 switch series	Release 63xx

Procedures

Configuring Device C

# Enable the NTP service.

<DeviceC> system-view

[DeviceC] ntp-service enable

# Specify the local clock as the reference source, with the stratum level 2.

[DeviceC] ntp-service refclock-master 2

# Assign an IP address to VLAN-interface 2.

[DeviceC] interface Vlan-interface 2

[DeviceC-Vlan-interface2] ip address 3.0.1.31 24

# Configure Device C to operate in multicast server mode and send multicast messages from VLAN-interface 2.

[DeviceC-Vlan-interface2] ntp-service multicast-server

Configuring Device D

# Enable the NTP service.

<DeviceD> system-view

[DeviceD] ntp-service enable

# Assign an IP address to VLAN-interface 2.

[DeviceD] interface Vlan-interface 2

[DeviceD-Vlan-interface2] ip address 3.0.1.32 24

# Configure Device D to operate in multicast client mode and receive multicast messages on VLAN-interface 2.

[DeviceD-Vlan-interface2] ntp-service multicast-client

Configuring Device B

# Assign an IP address to VLAN-interface 2. (Details not shown.)

# Enable the NTP service.

<DeviceB> system-view

[DeviceB] ntp-service enable

# Configure Device B to operate in multicast client mode and receive multicast messages on VLAN-interface 2.

[DeviceB-Vlan-interface2] ntp-service multicast-client

[DeviceB-Vlan-interface2] quit

Because Device A and Device C are on different subnets, you must enable the multicast functions on Device B before Device A can receive multicast messages from Device C.

# Enable IP multicast routing and IGMP.

[DeviceB] multicast routing

[DeviceB] interface vlan-interface 2

[DeviceB-Vlan-interface2] pim dm

[DeviceB-Vlan-interface2] quit

[DeviceB] vlan 3

[DeviceB-vlan3] port GigabitEthernet 1/0/1

[DeviceB-vlan3] quit

[DeviceB] interface vlan-interface 3

[DeviceB-Vlan-interface3] ip address 1.0.1.10 24

[DeviceB-Vlan-interface3] igmp enable

[DeviceB-Vlan-interface3] igmp static-group 224.0.1.1

[DeviceB-Vlan-interface3] quit

[DeviceB] igmp-snooping

[DeviceB-igmp-snooping] quit

[DeviceB] interface GigabitEthernet 1/0/1

[DeviceB-GigabitEthernet1/0/1] igmp-snooping static-group 224.0.1.1 vlan 3

Configuring Device A

# Enable the NTP service.

<DeviceA> system-view

[DeviceA] ntp-service enable

# Assign an IP address to VLAN-interface 3.

[DeviceA] interface Vlan-interface 3

[DeviceA-Vlan-interface3] ip address 1.0.1.11 24

# Configure Device A to operate in multicast client mode and receive multicast messages on VLAN-interface 3.

[DeviceA-Vlan-interface3] ntp-service multicast-client

Verifying the configuration

# Verify that Device A has synchronized to Device C, and the clock stratum level is 3 on Device A and 2 on Device C.

[DeviceA-Vlan-interface3] display ntp-service status

Clock status: synchronized

Clock stratum: 3

System peer: 3.0.1.31

Local mode: bclient

Reference clock ID: 3.0.1.31

Leap indicator: 00

Clock jitter: 0.000061 s

Stability: 0.000 pps

Clock precision: 2^-19

Root delay: 1.69373 ms

Root dispersion: 1950.18005 ms

Reference time: d5ee9b15.2f3a684d Thu, Sep 26 2019 11:37:57.184

System poll interval: 64 s

NOTE:

· For the S6550XE-HI switch series and the S6525XE-HI switch series, the value is 2^-21 for the Clock precision field in the output from the display ntp-service status command.

· For the S6812 switch series, S6813 switch series, and S5850 switch series, the value is 2^-23 for the Clock precision field in the output from the display ntp-service status command.

· For the S5170-EI switch series and S5570S-EI switch series, the value is 2^-18 for the Clock precision field in the output from the display ntp-service status command.

Configuration files

· Device A:

ntp-service enable

interface Vlan-interface3

ip address 1.0.1.11 255.255.255.0

ntp-service multicast-client

· Device B:

ntp-service enable

multicast routing

igmp-snooping

interface Vlan-interface2

ip address 3.0.1.30 255.255.255.0

pim dm

ntp-service multicast-client

interface Vlan-interface3

ip address 1.0.1.10 255.255.255.0

igmp enable

igmp static-group 224.0.1.1

interface GigabitEthernet1/0/1

port access vlan 3

igmp-snooping static-group 224.0.1.1 vlan 3

· Device C:

ntp-service enable

ntp-service refclock-master 2

interface Vlan-interface2

ip address 3.0.1.31 255.255.255.0

ntp-service multicast-server

· Device D:

ntp-service enable

interface Vlan-interface2

ip address 3.0.1.32 255.255.255.0

ntp-service multicast-client

Example: Configuring NTP client/server mode with authentication

Network configuration

As shown in Figure 4, configure the NTP client/server mode so all devices can be synchronized to Device A, the NTP server. Configure NTP authentication on Device A, Device B, and Device C.

Figure 4 Network diagram

Applicable hardware and software versions

The following matrix shows the hardware and software versions to which this configuration example is applicable:

Hardware	Software version
S6812 switch series S6813 switch series	Release 6615Pxx, Release 6628Pxx
S6550XE-HI switch series	Release 6008 and later, Release 8106Pxx
S6525XE-HI switch series	Release 6008 and later, Release 8106Pxx
S5850 switch series	Release 8005 and later
S5570S-EI switch series	Release 11xx
S5560X-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5560X-HI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5500V2-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-30F	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-30C MS4520V2-54C	Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-28S MS4520V2-24TP	Release 63xx
ES5500 switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S6520X-HI switch series S6520X-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S6520X-SI switch series S6520-SI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5000-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4600 switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5560S-EI switch series S5560S-SI switch series	Release 63xx
S5500V3-24P-SI S5500V3-48P-SI	Release 63xx
S5500V3-SI switch series (except the S5500V3-24P-SI and S5500V3-48P-SI)	Release 11xx
S5170-EI switch series	Release 11xx
S5130S-HI switch series S5130S-EI switch series S5130S-SI switch series S5130S-LI switch series	Release 63xx
S5120V2-SI switch series S5120V2-LI switch series	Release 63xx
S5120V3-EI switch series	Release 11xx
S5120V3-36F-SI S5120V3-28P-HPWR-SI S5120V3-54P-PWR-SI	Release 11xx
S5120V3-SI switch series (except the S5120V3-36F-SI, S5120V3-28P-HPWR-SI, and S5120V3-54P-PWR-SI)	Release 63xx
S5120V3-LI switch series	Release 63xx
S3600V3-EI switch series	Release 11xx
S3600V3-SI switch series	Release 11xx
S3100V3-EI switch series S3100V3-SI switch series	Release 63xx
S5110V2 switch series	Release 63xx
S5110V2-SI switch series	Release 63xx
S5000V3-EI switch series S5000V5-EI switch series	Release 63xx
S5000E-X switch series S5000X-EI switch series	Release 63xx
E128C E152C E500C switch series E500D switch series	Release 63xx
MS4320V2 switch series MS4320V3 switch series MS4300V2 switch series MS4320 switch series MS4200 switch series	Release 63xx
WS5850-WiNet switch series	Release 63xx
WS5820-WiNet switch series WS5810-WiNet switch series	Release 63xx
WAS6000 switch series	Release 63xx
IE4300-12P-AC & IE4300-12P-PWR IE4300-M switch series IE4320 switch series	Release 63xx

Procedures

Configuring Device A

# Assign an IP address to VLAN-interface 2.

<DeviceA> system-view

[DeviceA] interface Vlan-interface 2

[DeviceA-Vlan-interface2] ip address 1.0.1.11 24

# Enable the NTP service.

[DeviceA] ntp-service enable

# Specify the local clock as the reference source, with the stratum level 2.

[DeviceA] ntp-service refclock-master 2

# Enable NTP authentication on Device A.

[DeviceA] ntp-service authentication enable

# Set an authentication key, and input the key in plain text.

[DeviceA] ntp-service authentication-keyid 42 authentication-mode md5 simple aNiceKey

# Specify the key as a trusted key.

[DeviceA] ntp-service reliable authentication-keyid 42

Configuring Device B

# Assign an IP address to VLAN-interface 2. (Details not shown.)

# Enable the NTP service.

<DeviceB> system-view

[DeviceB] ntp-service enable

# Enable NTP authentication on Device B.

[DeviceB] ntp-service authentication enable

# Set an authentication key, and input the key in plain text.

[DeviceB] ntp-service authentication-keyid 42 authentication-mode md5 simple aNiceKey

# Specify the key as a trusted key.

[DeviceB] ntp-service reliable authentication-keyid 42

# Specify Device A as the NTP server of Device B, and associate the server with key 42.

[DeviceB] ntp-service unicast-server 1.0.1.11 authentication-keyid 42

Configuring Device C

# Assign an IP address to VLAN-interface 2. (Details not shown.)

# Enable the NTP service.

<DeviceC> system-view

[DeviceC] ntp-service enable

# Enable NTP authentication on Device C.

[DeviceC] ntp-service authentication enable

# Set an authentication key, and input the key in plain text.

[DeviceC] ntp-service authentication-keyid 42 authentication-mode md5 simple aNiceKey

# Specify the key as a trusted key.

[DeviceC] ntp-service reliable authentication-keyid 42

# Specify Device A as the NTP server of Device C, and associate the server with key 42.

[DeviceC] ntp-service unicast-server 1.0.1.11 authentication-keyid 42

Verifying the configuration

# Verify that Device B has synchronized to Device A, and the clock stratum level is 3 on Device B and 2 on Device A.

[DeviceB] display ntp-service status

Clock status: synchronized

Clock stratum: 3

System peer: 1.0.1.11

Local mode: client

Reference clock ID: 1.0.1.11

Leap indicator: 00

Clock jitter: 0.005096 s

Stability: 0.000 pps

Clock precision: 2^-19

Root delay: 0.00655 ms

Root dispersion: 1.15869 ms

Reference time: d0c62687.ab1bba7d Mon, Sep 30 2019 16:06:26.764

System poll interval: 64 s

# Verify that an IPv4 NTP association has been established between Device B and Device A.

[DeviceB] display ntp-service sessions

source reference stra reach poll now offset delay disper

********************************************************************************

[1245]1.0.1.11 127.127.1.0 2 1 64 519 -0.0 0.0065 0.0

Notes: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured.

Total sessions : 1

NOTE:

· For the S6550XE-HI switch series and the S6525XE-HI switch series, the value is 2^-21 for the Clock precision field in the output from the display ntp-service status command.

· For the S6812 switch series, S6813 switch series, and S5850 switch series, the value is 2^-23 for the Clock precision field in the output from the display ntp-service status command.

· For the S5170-EI switch series and S5570S-EI switch series, the value is 2^-18 for the Clock precision field in the output from the display ntp-service status command.

Configuration files

· Device A:

interface Vlan-interface2

ip address 1.0.1.11 255.255.255.0

ntp-service enable

ntp-service authentication enable

ntp-service authentication-keyid 42 authentication-mode md5 cipher $c$3$4j3SKCgQWBK3Un41B9U0JXzJX9i7IuNoSqi

ntp-service reliable authentication-keyid 42

ntp-service refclock-master 2

· Device B:

interface Vlan-interface2

ip address 1.0.1.12 255.255.255.0

ntp-service enable

ntp-service authentication enable

ntp-service authentication-keyid 42 authentication-mode md5 cipher $c$3$22eIc8l796cpudZqiaAZ2SLzIfrgzFTVYn8X

ntp-service reliable authentication-keyid 42

ntp-service unicast-server 1.0.1.11 authentication-keyid 42

· Device C:

interface Vlan-interface2

ip address 1.0.1.13 255.255.255.0

ntp-service enable

ntp-service authentication enable

ntp-service authentication-keyid 42 authentication-mode md5 cipher $c$3$XJzVmJ1TJbWyYAXpPXxF7JiEOZag8CehibM8

ntp-service reliable authentication-keyid 42

ntp-service unicast-server 1.0.1.11 authentication-keyid 42

Example: Configuring SNTP

Network configuration

As shown in Figure 5, configure SNTP so all devices can be synchronized to Device A, the NTP server.

Figure 5 Network diagram

Applicable hardware and software versions

The following matrix shows the hardware and software versions to which this configuration example is applicable:

Hardware	Software version
S6812 switch series S6813 switch series	Release 6615Pxx, Release 6628Pxx
S6550XE-HI switch series	Release 6008 and later, Release 8106Pxx
S6525XE-HI switch series	Release 6008 and later, Release 8106Pxx
S5850 switch series	Release 8005 and later
S5570S-EI switch series	Release 11xx
S5560X-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5560X-HI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5500V2-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-30F	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-30C MS4520V2-54C	Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-28S MS4520V2-24TP	Release 63xx
ES5500 switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S6520X-HI switch series S6520X-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S6520X-SI switch series S6520-SI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5000-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4600 switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5560S-EI switch series S5560S-SI switch series	Release 63xx
S5500V3-24P-SI S5500V3-48P-SI	Release 63xx
S5500V3-SI switch series (except the S5500V3-24P-SI and S5500V3-48P-SI)	Release 11xx
S5170-EI switch series	Release 11xx
S5130S-HI switch series S5130S-EI switch series S5130S-SI switch series S5130S-LI switch series	Release 63xx
S5120V2-SI switch series S5120V2-LI switch series	Release 63xx
S5120V3-EI switch series	Release 11xx
S5120V3-36F-SI S5120V3-28P-HPWR-SI S5120V3-54P-PWR-SI	Release 11xx
S5120V3-SI switch series (except the S5120V3-36F-SI, S5120V3-28P-HPWR-SI, and S5120V3-54P-PWR-SI)	Release 63xx
S5120V3-LI switch series	Release 63xx
S3600V3-EI switch series	Release 11xx
S3600V3-SI switch series	Release 11xx
S3100V3-EI switch series S3100V3-SI switch series	Release 63xx
S5110V2 switch series	Release 63xx
S5110V2-SI switch series	Release 63xx
S5000V3-EI switch series S5000V5-EI switch series	Release 63xx
S5000E-X switch series S5000X-EI switch series	Release 63xx
E128C E152C E500C switch series E500D switch series	Release 63xx
MS4320V2 switch series MS4320V3 switch series MS4300V2 switch series MS4320 switch series MS4200 switch series	Release 63xx
WS5850-WiNet switch series	Release 63xx
WS5820-WiNet switch series WS5810-WiNet switch series	Release 63xx
WAS6000 switch series	Release 63xx
IE4300-12P-AC & IE4300-12P-PWR IE4300-M switch series IE4320 switch series	Release 63xx

Procedures

Configuring Device A

# Assign an IP address to VLAN-interface 2.

<DeviceA> system-view

[DeviceA] interface Vlan-interface 2

[DeviceA-Vlan-interface2] ip address 1.0.1.11 24

# Enable the NTP service.

[DeviceA] ntp-service enable

# Specify the local clock as the reference source, with the stratum level 2.

[DeviceA] ntp-service refclock-master 2

Configuring Device B

# Assign an IP address to VLAN-interface 2. (Details not shown.)

# Enable the SNTP service.

<DeviceB> system-view

[DeviceB] sntp enable

# Specify Device A as the NTP server for Device B.

[DeviceB] sntp unicast-server 1.0.1.11

Configuring Device C

# Assign an IP address to VLAN-interface 2. (Details not shown.)

# Enable the SNTP service.

<DeviceC> system-view

[DeviceC] sntp enable

# Specify Device A as the NTP server for Device C.

[DeviceC] sntp unicast-server 1.0.1.11

Verifying the configuration

# Verify that an SNTP association has been established between Device B and Device A, and Device B has synchronized to Device A.

[DeviceB] display sntp sessions

SNTP server Stratum Version Last receive time

1.0.1.11 2 4 Thu, Sep 26 2019 17:25:09.121 (Synced)

Configuration files

· Device A:

interface Vlan-interface2

ip address 1.0.1.11 255.255.255.0

ntp-service enable

ntp-service refclock-master 2

· Device B:

interface Vlan-interface2

ip address 1.0.1.12 255.255.255.0

sntp enable

sntp unicast-server 1.0.1.11

· Device C:

interface Vlan-interface2

ip address 1.0.1.13 255.255.255.0

sntp enable

sntp unicast-server 1.0.1.11

Example: Configuring the IPv6 NTP client/server mode

Network configuration

As shown in Figure 1, configure the IPv6 NTP client/server mode so all devices can synchronize to Device A, the NTP server.

Figure 6 Network diagram

Applicable hardware and software versions

The following matrix shows the hardware and software versions to which this configuration example is applicable:

Hardware	Software version
S6812 switch series S6813 switch series	Release 6615Pxx, Release 6628Pxx
S6550XE-HI switch series	Release 6008 and later, Release 8106Pxx
S6525XE-HI switch series	Release 6008 and later, Release 8106Pxx
S5850 switch series	Release 8005 and later
S5570S-EI switch series	Release 11xx
S5560X-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5560X-HI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5500V2-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-30F	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-30C MS4520V2-54C	Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-28S MS4520V2-24TP	Release 63xx
ES5500 switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S6520X-HI switch series S6520X-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S6520X-SI switch series S6520-SI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5000-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4600 switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5560S-EI switch series S5560S-SI switch series	Release 63xx
S5500V3-24P-SI S5500V3-48P-SI	Release 63xx
S5500V3-SI switch series (except the S5500V3-24P-SI and S5500V3-48P-SI)	Release 11xx
S5170-EI switch series	Release 11xx
S5130S-HI switch series S5130S-EI switch series S5130S-SI switch series S5130S-LI switch series	Release 63xx
S5120V2-SI switch series S5120V2-LI switch series	Release 63xx
S5120V3-EI switch series	Release 11xx
S5120V3-36F-SI S5120V3-28P-HPWR-SI S5120V3-54P-PWR-SI	Release 11xx
S5120V3-SI switch series (except the S5120V3-36F-SI, S5120V3-28P-HPWR-SI, and S5120V3-54P-PWR-SI)	Release 63xx
S5120V3-LI switch series	Release 63xx
S3600V3-EI switch series	Release 11xx
S3600V3-SI switch series	Release 11xx
S3100V3-EI switch series S3100V3-SI switch series	Release 63xx
S5110V2 switch series	Release 63xx
S5110V2-SI switch series	Release 63xx
S5000V3-EI switch series S5000V5-EI switch series	Release 63xx
S5000E-X switch series S5000X-EI switch series	Release 63xx
E128C E152C E500C switch series E500D switch series	Release 63xx
MS4320V2 switch series MS4320V3 switch series MS4300V2 switch series MS4320 switch series MS4200 switch series	Release 63xx
WS5850-WiNet switch series	Release 63xx
WS5820-WiNet switch series WS5810-WiNet switch series	Release 63xx
WAS6000 switch series	Release 63xx
IE4300-12P-AC & IE4300-12P-PWR IE4300-M switch series IE4320 switch series	Release 63xx

Procedures

Configuring Device A

# Assign an IPv6 address to VLAN-interface 2.

<DeviceA> system-view

[DeviceA] interface vlan-interface 2

[DeviceA-Vlan-interface2] ipv6 address 3000::34 64

[DeviceA-Vlan-interface2] quit

# Enable the NTP service.

[DeviceA] ntp-service enable

# Specify the local clock as the reference source, with the stratum level 2.

[DeviceA] ntp-service refclock-master 2

Configuring Device B

# Assign an IPv6 address to each interface. (Details not shown.)

# Enable the NTP service.

<DeviceB> system-view

[DeviceB] ntp-service enable

# Specify Device A as the NTP server of Device B so that Device B is synchronized to Device A.

[DeviceB] ntp-service unicast-server 3000::34

Configuring Device C

# Assign an IPv6 address to each interface. (Details not shown.)

# Enable the NTP service.

<DeviceC> system-view

[DeviceC] ntp-service enable

# Specify Device A as the NTP server of Device C so that Device C is synchronized to Device A.

[DeviceC] ntp-service unicast-server 3000::34

Verifying the configuration

# Verify that Device B has synchronized to Device A, and the clock stratum level is 3 on Device B and 2 on Device A.

[DeviceB] display ntp-service status

Clock status: synchronized

Clock stratum: 3

System peer: 3000::34

Local mode: client

Reference clock ID: 95.197.17.40

Leap indicator: 00

Clock jitter: 0.003479 s

Stability: 0.000 pps

Clock precision: 2^-19

Root delay: 1.95313 ms

Root dispersion: 28.38135 ms

Reference time: d5ed8cd5.577006ea Wed, Sep 25 2019 16:24:53.341

System poll interval: 64 s

# Verify that an IPv6 NTP association has been established between Device B and Device A.

[DeviceB] display ntp-service ipv6 sessions

Notes: 1 source(master), 2 source(peer), 3 selected, 4 candidate, 5 configured.

Source: [12345] 3000::34

Reference: 127.127.1.0 Clock stratum: 2

Reachabilities: 3 Poll interval: 64

Last receive time: 62 Offset: 0.1272

Roundtrip delay: 1.8158 Dispersion: 188.47

Total sessions: 1

NOTE:

· For the S6550XE-HI switch series and the S6525XE-HI switch series, the value is 2^-21 for the Clock precision field in the output from the display ntp-service status command.

· For the S6812 switch series, S6813 switch series, and S5850 switch series, the value is 2^-23 for the Clock precision field in the output from the display ntp-service status command.

· For the S5170-EI switch series and S5570S-EI switch series, the value is 2^-18 for the Clock precision field in the output from the display ntp-service status command.

Configuration files

· Device A:

interface Vlan-interface2

ipv6 address 3000::34/64

ntp-service enable

ntp-service refclock-master 2

· Device B:

interface Vlan-interface2

ipv6 address 3000::35/64

ntp-service enable

ntp-service ipv6 unicast-server 3000::34

· Device C:

interface Vlan-interface2

ipv6 address 3000::36/64

ntp-service enable

ntp-service ipv6 unicast-server 3000::34

Example: Configuring the IPv6 NTP multicast mode

Network configuration

As shown in Figure 3, configure the IPv6 NTP multicast mode so all devices on different network segments can synchronize to Device C, the NTP server.

Figure 7 Network diagram

Applicable hardware and software versions

The following matrix shows the hardware and software versions to which this configuration example is applicable:

Hardware	Software version
S6812 switch series S6813 switch series	Release 6615Pxx, Release 6628Pxx
S6550XE-HI switch series	Release 6008 and later, Release 8106Pxx
S6525XE-HI switch series	Release 6008 and later, Release 8106Pxx
S5850 switch series	Release 8005 and later
S5570S-EI switch series	Release 11xx
S5560X-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5560X-HI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5500V2-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-30F	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-30C MS4520V2-54C	Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-28S MS4520V2-24TP	Release 63xx
ES5500 switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S6520X-HI switch series S6520X-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S6520X-SI switch series S6520-SI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5000-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4600 switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5560S-EI switch series S5560S-SI switch series	Release 63xx
S5500V3-24P-SI S5500V3-48P-SI	Release 63xx
S5500V3-SI switch series (except the S5500V3-24P-SI and S5500V3-48P-SI)	Release 11xx
S5170-EI switch series	Release 11xx
S5130S-HI switch series S5130S-EI switch series S5130S-SI switch series S5130S-LI switch series	Release 63xx
S5120V2-SI switch series S5120V2-LI switch series	Release 63xx
S5120V3-EI switch series	Release 11xx
S5120V3-36F-SI S5120V3-28P-HPWR-SI S5120V3-54P-PWR-SI	Release 11xx
S5120V3-SI switch series (except the S5120V3-36F-SI, S5120V3-28P-HPWR-SI, and S5120V3-54P-PWR-SI)	Release 63xx
S5120V3-LI switch series	Release 63xx
S3600V3-EI switch series	Release 11xx
S3600V3-SI switch series	Release 11xx
S3100V3-EI switch series S3100V3-SI switch series	Release 63xx
S5110V2 switch series	Release 63xx
S5110V2-SI switch series	Release 63xx
S5000V3-EI switch series S5000V5-EI switch series	Release 63xx
S5000E-X switch series S5000X-EI switch series	Release 63xx
E128C E152C E500C switch series E500D switch series	Release 63xx
MS4320V2 switch series MS4320V3 switch series MS4300V2 switch series MS4320 switch series MS4200 switch series	Release 63xx
WS5850-WiNet switch series	Release 63xx
WS5820-WiNet switch series WS5810-WiNet switch series	Release 63xx
WAS6000 switch series	Release 63xx
IE4300-12P-AC & IE4300-12P-PWR IE4300-M switch series IE4320 switch series	Release 63xx

Procedures

Configuring Device C

# Configure routing protocols so that all devices can reach each other. (Details not shown.)

# Enable the NTP service.

<DeviceC> system-view

[DeviceC] ntp-service enable

# Specify the local clock as the reference source, with the stratum level 2.

[DeviceC] ntp-service refclock-master 2

# Assign an IPv6 address to VLAN-interface 2.

[DeviceC] interface Vlan-interface 2

[DeviceC-Vlan-interface2] ipv6 address 3000::2 64

# Configure Device C to operate in IPv6 multicast server mode and send multicast messages from VLAN-interface 2.

[DeviceC-Vlan-interface2] ntp-service ipv6 multicast-server ff24::1

[DeviceC-Vlan-interface2] quit

Configuring Device D

# Configure routing protocols and assign an IP address to each interface so that all devices can reach each other. (Details not shown.)

# Enable the NTP service.

<DeviceD> system-view

[DeviceD] ntp-service enable

# Configure Device D to operate in IPv6 multicast client mode and receive multicast messages on VLAN-interface 2.

[DeviceD-Vlan-interface2] ntp-service ipv6 multicast-client ff24::1

[DeviceD-Vlan-interface2] quit

Configuring Device B

# Configure routing protocols and assign an IP address to each interface so that all devices can reach each other. (Details not shown.)

# Enable the NTP service.

<DeviceB> system-view

[DeviceB] ntp-service enable

# Configure Device B to operate in IPv6 multicast client mode and receive multicast messages on VLAN-interface 2.

[DeviceB-Vlan-interface2] ntp-service ipv6 multicast-client ff24::1

[DeviceB-Vlan-interface2] quit

Because Device A and Device C are on different subnets, you must enable IPv6 multicast functions on Device B before Device A can receive multicast messages from Device C.

# Enable IPv6 multicast functions.

[DeviceB] ipv6 multicast routing

[DeviceB-mrib6] quit

[DeviceB] interface vlan-interface 2

[DeviceB-Vlan-interface2] ipv6 pim dm

[DeviceB-Vlan-interface2] quit

[DeviceB] vlan 3

[DeviceB-vlan3] port GigabitEthernet 1/0/1

[DeviceB-vlan3] quit

[DeviceB] interface vlan-interface 3

[DeviceB-Vlan-interface3] mld enable

[DeviceB-Vlan-interface3] mld static-group ff24::1

[DeviceB-Vlan-interface3] quit

[DeviceB] mld-snooping

[DeviceB-mld-snooping] quit

[DeviceB] interface GigabitEthernet 1/0/1

[DeviceB-GigabitEthernet1/0/1] mld-snooping static-group ff24::1 vlan 3

[DeviceB-mld-snooping] quit

Configuring Device A

# Configure routing protocols and assign an IP address to each interface so that all devices can reach each other. (Details not shown.)

# Enable the NTP service.

<DeviceA> system-view

[DeviceA] ntp-service enable

# Configure Device A to operate in IPv6 multicast client mode and receive multicast messages on VLAN-interface 3.

[DeviceA-Vlan-interface3] ntp-service ipv6 multicast-client ff24::1

[DeviceA-Vlan-interface3] quit

Verifying the configuration

# Verify that Device A has synchronized to Device C, and the clock stratum level is 3 on Device A and 2 on Device C.

[DeviceA] display ntp-service status

Clock status: synchronized

Clock stratum: 3

System peer: 3000::2

Local mode: bclient

Reference clock ID: 165.84.121.65

Leap indicator: 00

Clock jitter: 0.000061 s

Stability: 0.000 pps

Clock precision: 2^-19

Root delay: 1.69373 ms

Root dispersion: 1950.18005 ms

Reference time: d5ee9b15.2f3a684d Thu, Sep 26 2019 11:37:57.184

System poll interval: 64 s

NOTE:

· For the S6550XE-HI switch series and the S6525XE-HI switch series, the value is 2^-21 for the Clock precision field in the output from the display ntp-service status command.

· For the S6812 switch series, S6813 switch series, and S5850 switch series, the value is 2^-23 for the Clock precision field in the output from the display ntp-service status command.

· For the S5170-EI switch series and S5570S-EI switch series, the value is 2^-18 for the Clock precision field in the output from the display ntp-service status command.

Configuration files

· Device A:

ntp-service enable

interface Vlan-interface3

ipv6 address 2000::1/64

ntp-service ipv6 multicast-client ff24::1

· Device B:

ntp-service enable

ipv6 multicast routing

mld-snooping

interface Vlan-interface2

ipv6 address 3000::1/64

ipv6 pim dm

ntp-service ipv6 multicast-client ff24::1

interface Vlan-interface3

ipv6 address 2000::2/64

mld enable

mld static-group ff24::1

interface GigabitEthernet1/0/1

port access vlan 3

mld-snooping static-group ff24::1 vlan 3

· Device C:

ntp-service enable

ntp-service refclock-master 2

interface Vlan-interface2

ipv6 address 3000::2/64

ntp-service ipv6 multicast-server ff24::1

· Device D:

ntp-service enable

interface Vlan-interface2

ipv6 address 3000::3/64

ntp-service ipv6 multicast-client ff24::1

Example: Configuring NTP broadcast mode with authentication

Network configuration

As shown in Figure 4, configure NTP broadcast mode so all devices can synchronize to Device A, the NTP server. Configure NTP authentication on Device A, Device B, and Device C.

Figure 8 Network diagram

Applicable hardware and software versions

The following matrix shows the hardware and software versions to which this configuration example is applicable:

Hardware	Software version
S6812 switch series S6813 switch series	Release 6615Pxx, Release 6628Pxx
S6550XE-HI switch series	Release 6008 and later, Release 8106Pxx
S6525XE-HI switch series	Release 6008 and later, Release 8106Pxx
S5850 switch series	Release 8005 and later
S5570S-EI switch series	Release 11xx
S5560X-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5560X-HI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5500V2-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-30F	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-30C MS4520V2-54C	Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4520V2-28S MS4520V2-24TP	Release 63xx
ES5500 switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S6520X-HI switch series S6520X-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S6520X-SI switch series S6520-SI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5000-EI switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
MS4600 switch series	Release 63xx, Release 65xx, Release 6615Pxx, Release 6628Pxx
S5560S-EI switch series S5560S-SI switch series	Release 63xx
S5500V3-24P-SI S5500V3-48P-SI	Release 63xx
S5500V3-SI switch series (except the S5500V3-24P-SI and S5500V3-48P-SI)	Release 11xx
S5170-EI switch series	Release 11xx
S5130S-HI switch series S5130S-EI switch series S5130S-SI switch series S5130S-LI switch series	Release 63xx
S5120V2-SI switch series S5120V2-LI switch series	Release 63xx
S5120V3-EI switch series	Release 11xx
S5120V3-36F-SI S5120V3-28P-HPWR-SI S5120V3-54P-PWR-SI	Release 11xx
S5120V3-SI switch series (except the S5120V3-36F-SI, S5120V3-28P-HPWR-SI, and S5120V3-54P-PWR-SI)	Release 63xx
S5120V3-LI switch series	Release 63xx
S3600V3-EI switch series	Release 11xx
S3600V3-SI switch series	Release 11xx
S3100V3-EI switch series S3100V3-SI switch series	Release 63xx
S5110V2 switch series	Release 63xx
S5110V2-SI switch series	Release 63xx
S5000V3-EI switch series S5000V5-EI switch series	Release 63xx
S5000E-X switch series S5000X-EI switch series	Release 63xx
E128C E152C E500C switch series E500D switch series	Release 63xx
MS4320V2 switch series MS4320V3 switch series MS4300V2 switch series MS4320 switch series MS4200 switch series	Release 63xx
WS5850-WiNet switch series	Release 63xx
WS5820-WiNet switch series WS5810-WiNet switch series	Release 63xx
WAS6000 switch series	Release 63xx
IE4300-12P-AC & IE4300-12P-PWR IE4300-M switch series IE4320 switch series	Release 63xx

Procedures

Configure Device C

# Enable the NTP service.

<DeviceC> system-view

[DeviceC] ntp-service enable

# Specify the local clock as the reference source, with the stratum level 2 on Device C.

[DeviceC] ntp-service refclock-master 2

# Enable NTP authentication on Device C. Configure an NTP authentication key, with the key ID of 88 and key value of 123456. Input the key in plain text, and specify it as a trusted key.

[DeviceC] ntp-service authentication enable

[DeviceC] ntp-service authentication-keyid 88 authentication-mode md5 simple 123456

[DeviceC] ntp-service reliable authentication-keyid 88

# Specify Device C as an NTP broadcast server, and associate key 88 with Device C.

[DeviceC] interface vlan-interface 2

[DeviceC-Vlan-interface2] ip address 3.0.1.31 24

[DeviceC-Vlan-interface2] ntp-service broadcast-server authentication-keyid 88

[DeviceC-Vlan-interface2] quit

Configure Device A

# Enable the NTP service.

<DeviceA> system-view

[DeviceA] ntp-service enable

# Enable NTP authentication on Device A. Configure an NTP authentication key, with the key ID of 88 and key value of 123456. Input the key in plain text, and specify it as a trusted key.

[DeviceA] ntp-service authentication enable

[DeviceA] ntp-service authentication-keyid 88 authentication-mode md5 simple 123456

[DeviceA] ntp-service reliable authentication-keyid 88

# Configure Device A to operate in NTP broadcast client mode and receive NTP broadcast messages on VLAN-interface 2.

[DeviceA] interface vlan-interface 2

[DeviceA-Vlan-interface2] ntp-service broadcast-client

[DeviceA-Vlan-interface2] ip address 3.0.1.33 24

[DeviceA-Vlan-interface2] quit

# Configure Device B, Device D, and Device E in the same way Device A is configured. (Details not shown.)

Verifying the configuration

# Verify that Device A has synchronized to Device C, and the clock stratum level is 3 on Device A and 2 on Device C.

[DeviceA] display ntp-service status

Clock status: synchronized

Clock stratum: 3

System peer: 3.0.1.31

Local mode: bclient

Reference clock ID: 3.0.1.31

Leap indicator: 00

Clock jitter: 0.000092 s

Stability: 0.000 pps

Clock precision: 2^-19

Root delay: 2.42615 ms

Root dispersion: 1950.98877 ms

Reference time: d5eed631.2f498d71 Thu, Sep 26 2019 15:50:09.184

System poll interval: 64 s

NOTE:

· For the S6550XE-HI switch series and the S6525XE-HI switch series, the value is 2^-21 for the Clock precision field in the output from the display ntp-service status command.

· For the S6812 switch series, S6813 switch series, and S5850 switch series, the value is 2^-23 for the Clock precision field in the output from the display ntp-service status command.

· For the S5170-EI switch series and S5570S-EI switch series, the value is 2^-18 for the Clock precision field in the output from the display ntp-service status command.

Configuration files

· Device A, Device B, Device D, and Device E:

interface Vlan-interface2

ip address 3.0.1.33 255.255.255.0

ntp-service broadcast-client

ntp-service enable

ntp-service authentication enable

ntp-service authentication-keyid 88 authentication-mode md5 cipher $c$3$pU6KvpS80MadhM2zM

CCSR07HX4qEbJhHvQ==

ntp-service reliable authentication-keyid 88

· Device C:

interface Vlan-interface2

ip address 3.0.1.31 255.255.255.0

ntp-service broadcast-server authentication-keyid 88

ntp-service enable

ntp-service authentication enable

ntp-service authentication-keyid 88 authentication-mode md5 cipher $c$3$iJudDKiqCVO+gOaG53

63/fz4M3dQvHo2Fw==

ntp-service reliable authentication-keyid 88

ntp-service refclock-master 3

H3C Fixed Port Campus Switches Configuration Examples-6W104

Introduction

Network configuration

Applicable hardware and software versions

Example: Configuring the NTP broadcast mode

Network configuration

Applicable hardware and software versions

Example: Configuring the NTP multicast mode

Network configuration

Applicable hardware and software versions

Example: Configuring NTP client/server mode with authentication

Network configuration

Network configuration

Example: Configuring NTP broadcast mode with authentication

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