Configuring NTP for IPv6 on Cisco Networks

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Configuring NTP for IPv6 on Cisco Networks

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Added by January 27, 2016

In my last blog I discussed Configuring HSRP for IPv6 on Cisco Networks.  Since it was already on my mind, I decided to continue the IPv6-oriented blogging and show how to configure and verify NTP for IPv6.  Let’s see how it works.

First, let’s see the topology I am using, shown in figure 1:

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001-topolory-Configuring-NTP-for-IPv6-on-Cisco-networks

Figure 1-NTP for IPv6 topology

I will not show the configuration of the IPv6 addresses on the interfaces or the routing (it is all static for this scenario), I will just show the IPv6 – NTP – related configs.

On R1, figure 2 shows the relevant config:

002-relevant-Configuring-NTP-for-IPv6-on-Cisco-networks

Figure 2-R1 NTP config

Figure 3 shows what is happening on R2:

003-R2-Configuring-NTP-for-IPv6-on-Cisco-networks

Figure 3-R2 NTP config

It turns out that the IPv6 address shown in figure 3 is the IPv6 address that is on loopback 100 of R1.  The last piece is R3.  Figure 4 shows that:

004-R3-Configuring-NTP-for-IPv6-on-Cisco-networks

Figure 4-R3 NTP config

In like manner, the IPv6 address shown in figure 4 is the IPv6 address that is configured on R2’s loopback 100 interface.

Now let’s verify NTP messages are occurring.  I issued a couple of debug commands on R2, shown in figure 5:

005-verify-NTP-messages-NTP-for-IPv6-on-Cisco-networks

Figure 5-R3 R2 debug output

Clearly I can verify that the NTP messages are appearing, and most assuredly they in IPv6 format!  I’m thinking this IPv6 thing is eventually going to take off!  J

Since we are here, let’s check the clock on R3:

006-Check-Clock-Configuring-NTP-for-IPv6-on-Cisco-networks

Figure 6-R3 R3 show clock detail

And that’s the way it is, Friday, September 11th, 2015.

If you have any comments or questions, please feel free to post them….
Until next time.

Mark Jacob
Cisco and CompTIA Network + Instructor – Interface Technical Training
Phoenix, AZ

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  1. Avatar zahidbilal

    kindly share your ntp ipv6 configurarion.

  2. Avatar zahidbilal

    kindly share your ntp ipv6 configurartion.

  3. Avatar Interface

    Can you send me the exact syntax of the command you used? Also send me the output of show ipv6 route and show ipv6 interface brief. What happens when you attempt to ping the IPv6 address you are trying to use in the ntp server command? Please identify the platform on which you are typing the commands: 2901 router, 3560 switch, ….

  4. Avatar Choud

    When i input the ntp server IPv6 address i get this error % NTP: IP name lookup for this hostname failed

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