enabling IPv6 on Cisco 6500 breaks IPv4 Internet connectivity

Nick Hilliard nick at foobar.org
Sun Jun 10 15:42:42 CEST 2012

On 10/06/2012 00:31, Jim Trotz wrote:
> In the lab we confirmed that a 6500 router with a full IPV4 configuration
> (VRFs, MPLS, MBGP [full table]) hangs when  2 ipv6 commands are entered (no
> other ipv6 commands - addresses, ect.) The problem happen when these
> commands are applied or removed.


you'd do much better to move this to cisco-nsp at puck.nether.net.  It's more
of a specialised 6500 problem than a general ipv6 issue, and there are some
people on that mailing list who are pretty clued in about the peculiarities
of the sup720.

Sounds like traffic is definitely being punted.  You can check this out by
attaching an ERSPAN session to the RP:



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