IPv6 support over ISL links

Unanswered Question
Jul 30th, 2009
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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!

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Giuseppe Larosa Thu, 07/30/2009 - 11:58
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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

http://www.cisco.com/en/US/partner/docs/ios/ipv6/configuration/guide/ip6-addrg_bsc_con.html#wp1284021


or


http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-addrg_bsc_con.html#wp1284021


Hope to help

Giuseppe


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