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New Member

ISIS adjacency flap when enabling ipv6 isis on interface

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

1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

ISIS adjacency flap when enabling ipv6 isis on interface

Hi Maurizio,

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

Regards

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
2 REPLIES
Cisco Employee

ISIS adjacency flap when enabling ipv6 isis on interface

Hi Maurizio,

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

Regards

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
New Member

ISIS adjacency flap when enabling ipv6 isis on interface

Thanks Harold, I'll try with another IOS version then.

Regards,

Maurizio

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