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ISIS adjacency flap when enabling ipv6 isis on interface

Answered Question
Jul 29th, 2013
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Hi all,


I'm enabling isis multi-topology in my network to support ipv6 (ipv4 already in place), but when I enable ipv6 router isis on an interface the adjacency flaps.

In detail, as soon as I configure "ipv6 router isis" on a vlan interface on the other side I get:


%CLNS-5-ADJCHANGE: ISIS: Adjacency to XXXX (VlanXX) Down, adjacency type changed

%CLNS-5-ADJCHANGE: ISIS: Adjacency to XXXX (VlanXX) Up, new adjacency


and the adjaceny type change from ISIS to M-ISIS (as expected).


Tested on 6509 WS-SUP720-3B with 12.2(33)SXH8b and 7606 WS-SUP720-3BXL with 12.2(18)SXF10. ISIS IPv4 is already configured and working as expected.


The global ISIS ipv6 configuration is the following:

router isis

address-family ipv6

multi-topology

exit-address-family


My understanding is that with multi-topology I should not see any flaps.


Am I missing something?


Thanks.


Regards,

Maurizio

Correct Answer by Harold Ritter about 4 years 3 weeks ago

Hi Maurizio,


This is actually the expected behavior with the versions you tested. Starting with SXI, the session is not reset.


Regards

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Correct Answer
Harold Ritter Wed, 07/31/2013 - 14:31
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  • Cisco Employee,

Hi Maurizio,


This is actually the expected behavior with the versions you tested. Starting with SXI, the session is not reset.


Regards

m.scano Thu, 08/01/2013 - 23:55
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Thanks Harold, I'll try with another IOS version then.


Regards,

Maurizio

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