IPv6 support over ISL links

ryabutler · ‎07-30-2009

I completed a project where we enabled IPv6 between two devices that were configured for ISL trunking.

They have IPv4 working and routing using OSPF.

When we enable IPv6 and try to ping directly across. Nothing!

When I build a GRE tunnel between the devices ... that works!

Why doesn't IPv6 working across ISL links natively? That's operating at a different layer and IPv4 works fine.

Any insight on that?

Thank you!

Giuseppe Larosa · ‎07-30-2009

Hello Rashida,

what IOS versions and platforms are involved?

support for IPV6 over ISL is reported from some specific releases here:

IPv6 data link: VLANs using Cisco Inter-Switch Link (ISL)

12.0(22)S 12.2(14)S 12.2(28)SB 12.2(25)SG 12.2(33)SRA12.2(2)T

12.3

12.3(2)T

12.4

12.4(2)T

see

or

Hope to help

Giuseppe