Wired Intelligent Edge (Campus Switching and Routing)

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[2530] Ipv6 address lost after some time

My device has the problem, that it lost the static ipv6 managment address after some time. So that it can only reached via ipv4. Then I can only reboot the switch, because readding it, will fails with:

vlan XX ipv6 address XXX/48 
XXX/48: Inconsistent value.

And this will logged when it happens:

I 06/20/20 11:31:57 04908 ntp: The system clock time was changed by 0 sec
            39306905 nsec.	 The new time is Sat Jun 20 11:31:57 2020
.
I 06/20/20 11:31:57 04910 ntp: All the NTP server associations reset.
W 06/20/20 11:39:02 00026 ip: Managment: ip address XXXXX/48
            removed from vlan XXX
I 06/20/20 12:32:02 04908 ntp: The system clock time was changed by 0 sec
            65092530 nsec.	 The new time is Sat Jun 20 12:32:02 2020
.
I 06/20/20 12:32:02 04910 ntp: All the NTP server associations reset.

 OS: YA.16.10.0007

 

Have anyone an idea, what goes wrong?

Thanks.


Accepted Solutions
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New Contributor

Re: [2530] Ipv6 address lost after some time

Hi @all,

after some test it looks like the device will only accept /64'er ipv6 addresses. After change the mask and reboot it, it will not lost the address any more. After that I have retest it with the /48'er mask to verify it. And than the same will happens again. So back to an /64'er mask.

View solution in original post


All Replies
Highlighted
New Contributor

Re: [2530] Ipv6 address lost after some time

Hi @all,

after some test it looks like the device will only accept /64'er ipv6 addresses. After change the mask and reboot it, it will not lost the address any more. After that I have retest it with the /48'er mask to verify it. And than the same will happens again. So back to an /64'er mask.

View solution in original post

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MVP Guru

Re: [2530] Ipv6 address lost after some time

IPv6 is pretty much standardized to /64 subnets assigned to interfaces/VLANs only. You might receive a /48 (or /56) from your provider, to be distributed in /64s inside your network.

 

You indeed should not deviate from that /64 unless you have a very good reason or like to get into trouble.

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