EIGRP IPv6 and VLAN interfaces

[gfowler721]

We've found that we have to set static link local IPs when two routers might peer over multiple VLAN interfaces.

The issue is that the routers, 6500s with sup720s, utilize the same autoconfig'd link local address on each VLAN interface.   EIGRP IPv6 refuses to peer with the other router on multple VLANs when the link local are the same.

Anyone else encounter this?   Did we miss a config option that would force unique link locals on different VLANs interfaces?

Because of this issue, we've made it our best practice to configure static link local for all inter-router transits.

[Nagendra Kumar Nainar]

HI Gary,

I had a setup with SU720 on 2 7600s and I am able to enable the neighborship without any issues. I didnt configure static link local as below,

Ryanair#show ipv6 int vlan 500  | inc FE

  IPv6 is enabled, link-local address is FE80::21C:B0FF:FEB5:6D00

Ryanair#sho ipv6 int vlan 501 | inc FE

  IPv6 is enabled, link-local address is FE80::21C:B0FF:FEB5:6D00

Ryanair#show ipv6 eigrp nei

EIGRP-IPv6 neighbors for process 100

H   Address                 Interface       Hold Uptime   SRTT   RTO  Q  Seq

                                            (sec)         (ms)       Cnt Num

1   Link-local address:     Vl501             11 00:15:51  816  4896  0  13

    FE80::222:55FF:FE17:25C0

0   Link-local address:     Vl500             11 00:17:14    1   200  0  12

    FE80::222:55FF:FE17:25C0

Ryanair#

Can you let us know the version on oth the devices?.

Regards,

Nagendra

[gfowler721]

Try this with staticly configured neighbors.

ipv6 router eigrp 2

neighbor FE80:blah:blah:blah Vlan10

neighbor FE80:blah:blah:blah Vlan20

[Nagendra Kumar Nainar]

Hi,

Works fine with static neighbor as well..

Ryanair#show run | sec ipv6 router eigr

ipv6 router eigrp 100

eigrp neighbor FE80::222:55FF:FE17:25C0 Vlan500

eigrp neighbor FE80::222:55FF:FE17:25C0 Vlan501

no shutdown

Ryanair#show ipv6 eigrp neighbors

EIGRP-IPv6 neighbors for process 100

H   Address                 Interface       Hold Uptime   SRTT   RTO  Q  Seq

                                            (sec)         (ms)       Cnt Num

1   Link-local address:     Vl501             14 00:02:40    1   200  0  23

    FE80::222:55FF:FE17:25C0

0   Link-local address:     Vl500             10 00:02:42    1   200  0  24

    FE80::222:55FF:FE17:25C0

Ryanair#

I tried in 12.2(33)SRD4 and works fine. Please let me know what version are you trying.

Regards,

Nagendra

[jkellers]

Hi,

I have had some of the same trouble when trying to route traffic between vlan-interfaces on the ASA5550 platform. If I got a vlan10 and a vlan11 with different link local addresses on each vlan interface, traffic will not pass. If i change the link local addresses so it is the same on both vlan10 and vlan11 traffic flows between those two interfaces, but something was unstable so my videocall dropped after a while. Don't know why, if it is the IPv6 static routing-support on ASA5500 running v8.4(1) is poor on this release? The ASA doesn't have full IPv6-support compared to Cisco IOS on routers.

Anyone who has any knowledge about this?

BR

Jesper