11-Network Management and Monitoring Configuration Examples

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02-H3C_NTP_Configuration_Examples
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H3C NTP Configuration Examples

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Software version: Release 7595

Document version: 6W100-20201031

 

Copyright © 2020 New H3C Technologies Co., Ltd. All rights reserved.

No part of this manual may be reproduced or transmitted in any form or by any means without prior written consent of New H3C Technologies Co., Ltd.

Except for the trademarks of New H3C Technologies Co., Ltd., any trademarks that may be mentioned in this document are the property of their respective owners.

The information in this document is subject to change without notice.


Contents

Introduction· 1

Prerequisites· 1

Example: Configuring the NTP client/server mode· 1

Network configuration· 1

Procedures· 1

Configuring Switch A· 1

Configuring Switch B· 2

Configuring Switch C· 2

Verifying the configuration· 2

Configuration files· 3

Example: Configuring the NTP broadcast mode· 3

Network configuration· 3

Procedures· 4

Configuring Switch C· 4

Configuring Switch A· 4

Configuring Switch B, Switch D, and Switch E· 4

Verifying the configuration· 5

Configuration files· 5

Example: Configuring the NTP multicast mode· 6

Network configuration· 6

Procedures· 7

Configuring Switch C· 7

Configuring Switch D·· 7

Configuring Switch B· 7

Configuring Switch A· 8

Verifying the configuration· 8

Configuration files· 8

Example: Configuring NTP authentication in client/server mode· 10

Network configuration· 10

Procedures· 10

Configuring Switch A· 10

Configuring Switch B· 11

Configuring Switch C· 11

Verifying the configuration· 11

Configuration files· 12

Example: Configuring SNTP·· 13

Network configuration· 13

Procedures· 13

Configuring Switch A· 13

Configuring Switch B· 13

Configuring Switch C· 14

Verifying the configuration· 14

Configuration files· 14

Example: Configuring the IPv6 NTP client/server mode· 15

Network configuration· 15

Procedures· 15

Configuring Switch A· 15

Configuring Switch B· 15

Configuring Switch C· 16

Verifying the configuration· 16

Configuration files· 16

Example: Configuring the IPv6 NTP multicast mode· 17

Network configuration· 17

Procedures· 18

Configuring Switch C· 18

Configuring Switch D·· 18

Configuring Switch B· 18

Configuring Switch A· 19

Verifying the configuration· 19

Configuration files· 20

Example: Configuring NTP authentication in broadcast mode· 21

Network configuration· 21

Procedures· 21

Configure Switch C· 21

Configure Switch A· 22

Configuring Switch B, Switch D, and Switch E· 22

Verifying the configuration· 22

Configuration files· 22

Related documentation· 23

 


Introduction

This document provides NTP configuration examples.

Prerequisites

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, Switch A is an NTP server. For time synchronization on the network, configure the NTP client/server mode so that Switch B and Switch C synchronize with Switch A.

Figure 1 Network diagram

 

Procedures

Configuring Switch A

# Assign an IP address to VLAN-interface 2.

<SwitchA> system-view

[SwitchA] interface Vlan-interface 2

[SwitchA-Vlan-interface2] ip address 1.0.1.11 24

[SwitchA-Vlan-interface2] quit

# Enable the NTP service.

[SwitchA] ntp-service enable

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

[SwitchA] ntp-service refclock-master 2

Configuring Switch B

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

# Enable the NTP service.

<SwitchB> system-view

[SwitchB] ntp-service enable

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

[SwitchB] ntp-service unicast-server 1.0.1.11

Configuring Switch C

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

# Enable the NTP service.

<SwitchC> system-view

[SwitchC] ntp-service enable

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

[SwitchC] ntp-service unicast-server 1.0.1.11

Verifying the configuration

If the configuration is correct, Switch B and Switch C synchronize the time with Switch A. The following uses Switch B as an example to verify the configuration.

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

[SwitchB] 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^-18

 Root delay: 1.95313 ms

 Root dispersion: 28.38135 ms

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

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

[SwitchB] 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

Configuration files

·     Switch A:

#

interface Vlan-interface2

 ip address 1.0.1.11 255.255.255.0

#

 ntp-service enable

 ntp-service refclock-master 2

#

·     Switch 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

#

·     Switch 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, the devices are on the same network segment (3.0.1.0/24). For time synchronization on the network, configure the NTP broadcast mode so that the devices synchronize with Switch C.

Figure 2 Network diagram

 

Procedures

Configuring Switch C

# Enable the NTP service.

<SwitchC> system-view

[SwitchC] ntp-service enable

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

[SwitchC] ntp-service refclock-master 2

# Assign an IP address to VLAN-interface 2.

[SwitchC] interface Vlan-interface 2

[SwitchC-Vlan-interface2] ip address 3.0.1.31 24

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

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

Configuring Switch A

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

# Enable the NTP service on Switch A.

<SwitchA> system-view

[SwitchA] ntp-service enable

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

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

Configuring Switch B, Switch D, and Switch E

The configuration procedure is the same for Switch A, Switch B, Switch D, and Switch E. See "Configuring Switch A" for the configuration procedure.

Verifying the configuration

If the configuration is correct, Switch A, Switch B, Switch D, and Switch E synchronize the time with Switch C. The following uses Switch A as an example to verify the configuration.

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

[SwitchA-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^-18

 Root delay: 0.00000 ms

 Root dispersion: 7951.43127 ms

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

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

[SwitchA-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

Configuration files

·     Switch 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

#

·     Switch A:

#

interface Vlan-interface2

 ip address 3.0.1.33 255.255.255.0

 ntp-service broadcast-client

#

 ntp-service enable

#

·     Switch B:

#

interface Vlan-interface2

 ip address 3.0.1.30 255.255.255.0

 ntp-service broadcast-client

#

 ntp-service enable

#

·     Switch D:

#

interface Vlan-interface2

 ip address 3.0.1.32 255.255.255.0

 ntp-service broadcast-client

#

 ntp-service enable

#

·     Switch 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, the devices are on different network segments. For time synchronization on the network, configure the NTP multicast mode so that the devices synchronize with Switch C.

Figure 3 Network diagram

 

Procedures

Configuring Switch C

# Enable the NTP service.

<SwitchC> system-view

[SwitchC] ntp-service enable

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

[SwitchC] ntp-service refclock-master 2

# Assign an IP address to VLAN-interface 2.

[SwitchC] interface Vlan-interface 2

[SwitchC-Vlan-interface2] ip address 3.0.1.31 24

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

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

Configuring Switch D

# Enable the NTP service.

<SwitchD> system-view

[SwitchD] ntp-service enable

# Assign an IP address to VLAN-interface 2.

[SwitchD] interface Vlan-interface 2

[SwitchD-Vlan-interface2] ip address 3.0.1.32 24

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

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

Configuring Switch B

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

# Enable the NTP service.

<SwitchB> system-view

[SwitchB] ntp-service enable

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

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

[SwitchB-Vlan-interface2] quit

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

# Enable IP multicast routing and IGMP.

[SwitchB] multicast routing

[SwitchB] interface vlan-interface 2

[SwitchB-Vlan-interface2] pim dm

[SwitchB-Vlan-interface2] quit

[SwitchB] vlan 3

[SwitchB-vlan3] port Ten-GigabitEthernet 1/0/1

[SwitchB-vlan3] quit

[SwitchB] interface vlan-interface 3

[SwitchB-Vlan-interface3] ip address 1.0.1.10 24

[SwitchB-Vlan-interface3] igmp enable

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

[SwitchB-Vlan-interface3] quit

[SwitchB] igmp-snooping

[SwitchB-igmp-snooping] quit

[SwitchB] interface Ten-GigabitEthernet 1/0/1

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

Configuring Switch A

# Enable the NTP service.

<SwitchA> system-view

[SwitchA] ntp-service enable

# Assign an IP address to VLAN-interface 3.

[SwitchA] interface Vlan-interface 3

[SwitchA-Vlan-interface3] ip address 1.0.1.11 24

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

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

Verifying the configuration

If the configuration is correct, Switch A, Switch B, and Switch D synchronize the time with Switch C. The following uses Switch A as an example to verify the configuration.

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

[SwitchA-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^-18

 Root delay: 1.69373 ms

 Root dispersion: 1950.18005 ms

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

Configuration files

·     Switch A:

#

 ntp-service enable

#

interface Vlan-interface3

 ip address 1.0.1.11 255.255.255.0

 ntp-service multicast-client

#

·     Switch 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 Ten-GigabitEthernet1/0/1

 port access vlan 3

 igmp-snooping static-group 224.0.1.1 vlan 3

#

·     Switch 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

#

·     Switch D:

#

 ntp-service enable

#

interface Vlan-interface2

 ip address 3.0.1.32 255.255.255.0

 ntp-service multicast-client

#

Example: Configuring NTP authentication in client/server mode

Network configuration

As shown in Figure 4, Switch A is an NTP server. For time synchronization on the network, configure the NTP client/server mode so that the devices synchronize with Switch A. Configure NTP authentication so that Switch A is authenticated before synchronizing the devices.

Figure 4 Network diagram

 

Procedures

Configuring Switch A

# Assign an IP address to VLAN-interface 2.

<SwitchA> system-view

[SwitchA] interface Vlan-interface 2

[SwitchA-Vlan-interface2] ip address 1.0.1.11 24

# Enable the NTP service.

[SwitchA] ntp-service enable

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

[SwitchA] ntp-service refclock-master 2

# Enable NTP authentication on Switch A.

[SwitchA] ntp-service authentication enable

# Configure a plaintext authentication key, specifying the key ID as 42 and key string as aNiceKey.

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

# Configure the key as a trusted key.

[SwitchA] ntp-service reliable authentication-keyid 42

Configuring Switch B

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

# Enable the NTP service.

<SwitchB> system-view

[SwitchB] ntp-service enable

# Enable NTP authentication on Switch B.

[SwitchB] ntp-service authentication enable

# Configure a plaintext authentication key, specifying the key ID as 42 and key string as aNiceKey.

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

# Configure the key as a trusted key.

[SwitchB] ntp-service reliable authentication-keyid 42

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

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

Configuring Switch C

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

# Enable the NTP service.

<SwitchC> system-view

[SwitchC] ntp-service enable

# Enable NTP authentication on Switch C.

[SwitchC] ntp-service authentication enable

# Configure a plaintext authentication key, specifying the key ID as 42 and key string as aNiceKey.

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

# Configure the key as a trusted key.

[SwitchC] ntp-service reliable authentication-keyid 42

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

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

Verifying the configuration

If the configuration is correct, Switch B and Switch C synchronize the time with Switch A. The following uses Switch B as an example to verify the configuration.

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

[SwitchB] 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^-18

 Root delay: 0.00655 ms

 Root dispersion: 1.15869 ms

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

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

[SwitchB] 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

Configuration files

·     Switch 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

#

·     Switch 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

#

·     Switch 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, Switch A is an NTP server. For time synchronization on the network, configure Switch B and Switch C as SNTP clients to synchronize with Switch A.

Figure 5 Network diagram

 

Procedures

Configuring Switch A

# Assign an IP address to VLAN-interface 2.

<SwitchA> system-view

[SwitchA] interface Vlan-interface 2

[SwitchA-Vlan-interface2] ip address 1.0.1.11 24

# Enable the NTP service.

[SwitchA] ntp-service enable

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

[SwitchA] ntp-service refclock-master 2

Configuring Switch B

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

# Enable the SNTP service.

<SwitchB> system-view

[SwitchB] sntp enable

# Specify Switch A as the NTP server of Switch B.

[SwitchB] sntp unicast-server 1.0.1.11

Configuring Switch C

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

# Enable the SNTP service.

<SwitchC> system-view

[SwitchC] sntp enable

# Specify Switch A as the NTP server of Switch C.

[SwitchC] sntp unicast-server 1.0.1.11

Verifying the configuration

If the configuration is correct, Switch B and Switch C synchronize the time with Switch A. The following uses Switch B as an example to verify the configuration.

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

[SwitchB] 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

·     Switch A:

#

interface Vlan-interface2

 ip address 1.0.1.11 255.255.255.0

#

 ntp-service enable

 ntp-service refclock-master 2

#

·     Switch B:

#

interface Vlan-interface2

 ip address 1.0.1.12 255.255.255.0

#

 sntp enable

 sntp unicast-server 1.0.1.11

#

·     Switch 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, Switch A is an NTP server on the IPv6 network. For time synchronization on the network, configure the IPv6 NTP client/server mode so that Switch B and Switch C synchronize with Switch A.

Figure 6 Network diagram

 

Procedures

Configuring Switch A

# Assign an IPv6 address to VLAN-interface 2.

<SwitchA> system-view

[SwitchA] interface vlan-interface 2

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

[SwitchA-Vlan-interface2] quit

# Enable the NTP service.

[SwitchA] ntp-service enable

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

[SwitchA] ntp-service refclock-master 2

Configuring Switch B

# Assign an IPv6 address to VLAN-interface 2. (Details not shown.)

# Enable the NTP service.

<SwitchB> system-view

[SwitchB] ntp-service enable

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

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

Configuring Switch C

# Assign an IPv6 address to VLAN-interface 2. (Details not shown.)

# Enable the NTP service.

<SwitchC> system-view

[SwitchC] ntp-service enable

# Specify Switch A as the NTP server of Switch C so that Switch C is synchronized with Switch A.

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

Verifying the configuration

If the configuration is correct, Switch B and Switch C synchronize the time with Switch A. The following uses Switch B as an example to verify the configuration.

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

[SwitchB] 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^-18

 Root delay: 1.95313 ms

 Root dispersion: 28.38135 ms

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

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

[SwitchB] 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

Configuration files

·     Switch A:

#

interface Vlan-interface2

 ipv6 address 3000::34/64

#

 ntp-service enable

 ntp-service refclock-master 2

#

·     Switch B:

#

interface Vlan-interface2

 ipv6 address 3000::35/64

#

 ntp-service enable

 ntp-service ipv6 unicast-server 3000::34

#

·     Switch 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, Switch C is an NTP server on the IPv6 network, and the devices are on different network segments. For time synchronization on the network, configure the IPv6 NTP multicast mode so that the devices synchronize with Switch C.

Figure 7 Network diagram

 

Procedures

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

Configuring Switch C

# Enable the NTP service.

<SwitchC> system-view

[SwitchC] ntp-service enable

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

[SwitchC] ntp-service refclock-master 2

# Assign an IPv6 address to VLAN-interface 2.

[SwitchC] interface Vlan-interface 2

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

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

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

[SwitchC-Vlan-interface2] quit

Configuring Switch D

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

# Enable the NTP service.

<SwitchD> system-view

[SwitchD] ntp-service enable

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

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

[SwitchD-Vlan-interface2] quit

Configuring Switch B

# Assign an IP address to VLAN-interface 2 and VLAN-interface 3. (Details not shown.)

# Enable the NTP service.

<SwitchB> system-view

[SwitchB] ntp-service enable

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

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

[SwitchB-Vlan-interface2] quit

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

# Enable IPv6 multicast functions.

[SwitchB] ipv6 multicast routing

[SwitchB-mrib6] quit

[SwitchB] interface vlan-interface 2

[SwitchB-Vlan-interface2] ipv6 pim dm

[SwitchB-Vlan-interface2] quit

[SwitchB] vlan 3

[SwitchB-vlan3] port Ten-GigabitEthernet 1/0/1

[SwitchB-vlan3] quit

[SwitchB] interface vlan-interface 3

[SwitchB-Vlan-interface3] mld enable

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

[SwitchB-Vlan-interface3] quit

[SwitchB] mld-snooping

[SwitchB-mld-snooping] quit

[SwitchB] interface Ten-GigabitEthernet 1/0/1

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

[SwitchB-mld-snooping] quit

Configuring Switch A

# Assign an IP address to VLAN-interface 3. (Details not shown.)

# Enable the NTP service.

<SwitchA> system-view

[SwitchA] ntp-service enable

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

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

[SwitchA-Vlan-interface3] quit

Verifying the configuration

If the configuration is correct, Switch A, Switch B, and Switch D synchronize the time with Switch C. The following uses Switch A as an example to verify the configuration.

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

[SwitchA] 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^-14

 Root delay: 1.69373 ms

 Root dispersion: 1950.18005 ms

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

Configuration files

·     Switch A:

#

 ntp-service enable

#

interface Vlan-interface3

 ipv6 address 2000::1/64

 ntp-service ipv6 multicast-client ff24::1

#

·     Switch 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 Ten-GigabitEthernet1/0/1

 port access vlan 3

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

#

·     Switch C:

#

 ntp-service enable

ntp-service refclock-master 2

#

interface Vlan-interface2

 ipv6 address 3000::2/64

 ntp-service ipv6 multicast-server ff24::1

#

·     Switch D:

#

 ntp-service enable

#

interface Vlan-interface2

 ipv6 address 3000::3/64

 ntp-service ipv6 multicast-client ff24::1

#

Example: Configuring NTP authentication in broadcast mode

Network configuration

As shown in Figure 4, the devices are on the same network segment (3.0.1.0/24). Configure the NTP broadcast mode so that the devices synchronize with Switch C. Configure NTP authentication so that Switch C is authenticated before synchronizing the devices.

Figure 8 Network diagram

 

Procedures

Configure Switch C

# Enable the NTP service.

<SwitchC> system-view

[SwitchC] ntp-service enable

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

[SwitchC] ntp-service refclock-master 2

# Enable NTP authentication on Switch C. Configure a plaintext authentication key, specifying the key ID as 88 and key string as 123456. Configure the key as a trusted key.

[SwitchC] ntp-service authentication enable

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

[SwitchC] ntp-service reliable authentication-keyid 88

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

[SwitchC] interface vlan-interface 2

[SwitchC-Vlan-interface2] ip address 3.0.1.31 24

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

[SwitchC-Vlan-interface2] quit

Configure Switch A

# Enable the NTP service on Switch A.

<SwitchA> system-view

[SwitchA] ntp-service enable

# Enable NTP authentication on Switch A. Configure a plaintext authentication key, specifying the key ID as 88 and key string as 123456. Configure the key as a trusted key.

[SwitchA] ntp-service authentication enable

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

[SwitchA] ntp-service reliable authentication-keyid 88

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

[SwitchA] interface vlan-interface 2

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

[SwitchA-Vlan-interface2] ip address 3.0.1.33 24

[SwitchA-Vlan-interface2] quit

Configuring Switch B, Switch D, and Switch E

The configuration procedure is the same for Switch A, Switch B, Switch D, and Switch E. See "Configure Switch A" for the configuration procedure.

Verifying the configuration

If the configuration is correct, Switch A, Switch B, Switch D, and Switch E synchronize the time with Switch C. The following example uses Switch A to verify the configuration.

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

[SwitchA] 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^-18

 Root delay: 2.42615 ms

 Root dispersion: 1950.98877 ms

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

Configuration files

·     Switch A, Switch B, Switch D, and Switch 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

#

·     Switch 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

#

Related documentation

·     H3C S10500X Switch Series Network Management and Monitoring Configuration Guide-R759X

·     H3C S10500X Switch Series Network Management and Monitoring Command Reference-R759X