Router 2800 series doesn't join all-routers

Answered Question
Jun 19th, 2012
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Hi guys,


When a router has ipv6 enabled, this one has to join the multicast group FF02::2 (all-routers). This is confirmed here :

http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-addrg_bsc_con.html#wp1373266


But, with a 2800 series router (Version 12.4(1r)), after adding an ipv6, my interface doesn't automatically join that group, but only all-nodes and the solicited-node:


  Global unicast address(es):

    2001:662:4203:105:217:59FF:FE02:8DB9, subnet is 2001:662:4203:105::/64 [EUI]


  Joined group address(es):

    FF02::1

    FF02::1:FF02:8DB9


Therefore, all Router Solicitations fail.


Have any idea?

Correct Answer by stmillet about 5 years 1 month ago

Julien,


A few questions,

1) What is the version of IOS is running on the 2800? (the version you list is a rommon image, the IOS should be something like 12.4(15)T3, or failing that provide an image name c2800-ipservices-124-15-T3.bin or the like)


2) What is the full config of the interface in question ?


3) Have you turned on IPv6 unicast-routing globally ?


Cheers


Stephan

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Michael Vincent Tue, 06/19/2012 - 08:40
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Looks like it may be a problem with neighbor discovery mechanisms.  They may be off on the interface.  Have a look under the interface for:


"ipv6 nd ..."


commands.  For example:


http://www.cisco.com/en/US/partner/docs/ios/ipv6/command/reference/ipv6_07.html


In some instances, router advertisements are surpressed (e.g., tunnel interfaces) and need to be turned on.


cheers.

Correct Answer
stmillet Wed, 06/20/2012 - 18:46
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  • Cisco Employee,

Julien,


A few questions,

1) What is the version of IOS is running on the 2800? (the version you list is a rommon image, the IOS should be something like 12.4(15)T3, or failing that provide an image name c2800-ipservices-124-15-T3.bin or the like)


2) What is the full config of the interface in question ?


3) Have you turned on IPv6 unicast-routing globally ?


Cheers


Stephan

lemanchotvolant Mon, 06/25/2012 - 05:22
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Thank you Michael and Stephan.


I had not turned on the unicast-routing for IPv6 .


Regards,

ju.

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