IPv6 over L3 etherchannel

fonque

I am trying to build the TSHOOT topology at home and hit a snag. I cannot get ipv6 connectivity to work over an L3 etherchannel at all and I cant figure out why. IPv4 connectivity works just fine. EIGRP is passing updates without issue. However, I cannot even get an IPv6 ping across that etherchannel. I am using 2 3550's for this connection. Below are the configs:

MLS1#
interface Port-channel12
no switchport
ip address 10.2.4.13 255.255.255.252
ipv6 address 2026::3:1/122
ipv6 enable
ipv6 rip RIP_ZONE enable

interface FastEthernet0/23
no switchport
no ip address
ipv6 enable
channel-group 12 mode desirable

interface FastEthernet0/24
no switchport
no ip address
ipv6 enable
channel-group 12 mode desirable
end

====================================
MLS2#
interface Port-channel12
no switchport
ip address 10.2.4.14 255.255.255.252
ipv6 address 2026::3:2/122
ipv6 enable
ipv6 rip RIP_ZONE enable

interface FastEthernet0/23
no switchport
no ip address
ipv6 enable
channel-group 12 mode desirable

interface FastEthernet0/24
no switchport
no ip address
ipv6 enable
channel-group 12 mode desirable
end


Any help is very much appreciated!

stuh84

I was under the impression IPv6 didn't work on 3550s. Even if you can put the commands in, I don't think it works.

jason_lunde

stuh84 wrote: »

I was under the impression IPv6 didn't work on 3550s. Even if you can put the commands in, I don't think it works.

This is correct, it does not work.

fonque

I was able to get IPv6 to work over my 3550's the above config will not work, as I found out, because 3550s apparently do not support IPv6 in hardware, only in software. I was only able to get IPv6 working by sending IPv6 traffic over GRE tunnels using IPv4 end points. After that RIPng and OSPFv3 will work.
the following is the config I used to get IPv6 working on a 3550:

MLS1:
interface Port-channel12
no switchport
ip address 10.2.4.13 255.255.255.252

interface Tunnel12
no ip address
ipv6 address 2026::3:1/122
ipv6 enable
ipv6 rip RIP_ZONE enable
tunnel source 10.2.4.13
tunnel destination 10.2.4.14
end

MLS2:
interface Port-channel12
no switchport
ip address 10.2.4.14 255.255.255.252

interface Tunnel12
no ip address
ipv6 address 2026::3:2/122
ipv6 enable
ipv6 rip RIP_ZONE enable
tunnel source 10.2.4.14
tunnel destination 10.2.4.13
end

With the above config, RIPng works fine, IPv6 pings work fine and the IPv6 routing table is not showing any anomalies

MLS2#sh ipv6 route
IPv6 Routing Table - Default - 5 entries
Codes: C - Connected, L - Local, S - Static, U - Per-user Static route
R - RIP, D - EIGRP, EX - EIGRP external
R ::/0 [120/3]
via FE80::213:1AFF:FE48:E100, Tunnel12
R 2026::2:0/122 [120/2]
via FE80::213:1AFF:FE48:E100, Tunnel12
C 2026::3:0/122 [0/0]
via Tunnel12, directly connected
L 2026::3:2/128 [0/0]
via Tunnel12, receive
L FF00::/8 [0/0]
via Null0, receive

networker050184

I don't think GRE tunnels are a supported feature on the 3550 either even though it might work on a small scale.

fonque

Nope not supported, but lets me get little more use out of my 3550s for studying.

ampdeck

this is interesting..... thanks for sharing mate!