[c-nsp] IPv6 on C3550, finally? (12.2(44)SE)

[Prabhu Gurumurthy]

Simon Lockhart wrote:
> Noticed that 12.2(44)SE was recently released for the Cat3550 switch, and
> feature navigator lists a whole load of IPv6 support. Yay!
> 
> However, it doesn't seem to work very well...
> 
> interface Loopback0
>  no ip address
>  ipv6 address 2001:4B10::100/128
>  ipv6 enable
> end
> 
> lab-sw.rbsov#ping 2001:4b10::100
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 2001:4B10::100, timeout is 2 seconds:
> !!!!!
> Success rate is 100 percent (5/5), round-trip min/avg/max = 0/2/4 ms
> 
> However, if I try to do IPv6 over an ethernet port, it's less successful...
> 
> interface Vlan515
>  no ip address
>  ipv6 address 2001:4B10:0:2::2/64
>  ipv6 enable
> end
> 
> lab-sw.rbsov#ping 2001:4b10:0:2::1
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 2001:4B10:0:2::1, timeout is 2 seconds:
> .....
> Success rate is 0 percent (0/5)
> 
> Running "debug ipv6 packet" on both ends of the link shows packets being
> sent by lab-sw, and replies being sent by the upstream switch (a 3560), but
> the 3550 never learns any neighbours, and pings don't work...
> 
> lab-sw.rbsov#show ipv6 nei
> lab-sw.rbsov#
> 
> Have I missed something needed to make this work, or is it just a work in 
> progress, released prematurely?
> 
> Simon

Can you do a tcp dump/wireshark for ether proto 0x86dd and see whether neigh 
discoveries are happening?

Atleast in my network, when I ping 3750 with unicast routing enabled and ipv6 nd 
enabled, from within a VLAN I see neigh solicitation and neighbor discovery 
happening followed by echo req and echo reply.

When you do show ipv6 nei and nothing is happening, I believe neighbor discovery 
has not happened for some unknown reason

The following may be relevant to you or may not be, but this is what I am seeing

command(s) used:
sudo tcpdump -ennNSXxv -s 1518 -i pcn0 ether proto 0x86dd

$ ping6 fdc2:c2cd:d343:39a6:21c:fff:fea6:6348
PING6(56=40+8+8 bytes) fdc2:c2cd:d343:39a6:20c:29ff:fe20:b1ff --> 
fdc2:c2cd:d343:39a6:21c:fff:fea6:6348
16 bytes from fdc2:c2cd:d343:39a6:21c:fff:fea6:6348, icmp_seq=0 hlim=64 
time=3.565 ms
16 bytes from fdc2:c2cd:d343:39a6:21c:fff:fea6:6348, icmp_seq=1 hlim=64 
time=1.056 ms
^C
--- fdc2:c2cd:d343:39a6:21c:fff:fea6:6348 ping6 statistics ---
2 packets transmitted, 2 packets received, 0.0% packet loss
round-trip min/avg/max/std-dev = 1.056/2.310/3.565/1.255 ms

10:14:10.752467 00:0c:29:20:b1:ff 33:33:ff:a6:63:48 86dd 86: 
fdc2:c2cd:d343:39a6:20c:29ff:fe20:b1ff > ff02::1:ffa6:6348: icmp6: neighbor sol: 
who has fdc2:c2cd:d343:39a6:21c:fff:fea6:6348(src lladdr: 00:0c:29:20:b1:ff) 
(len 32, hlim 255)
   0000: 6000 0000 0020 3aff fdc2 c2cd d343 39a6  `.... :ÿýÂÂÍÓC9¦
   0010: 020c 29ff fe20 b1ff ff02 0000 0000 0000  ..)ÿþ ±ÿÿ.......
   0020: 0000 0001 ffa6 6348 8700 4f59 0000 0000  ....ÿ¦cH..OY....
   0030: fdc2 c2cd d343 39a6 021c 0fff fea6 6348  ýÂÂÍÓC9¦...ÿþ¦cH
   0040: 0101 000c 2920 b1ff                      ....) ±ÿ

10:14:10.752504 00:1c:0f:a6:63:48 00:0c:29:20:b1:ff 86dd 86: 
fdc2:c2cd:d343:39a6:21c:fff:fea6:6348 > fdc2:c2cd:d343:39a6:20c:29ff:fe20:b1ff: 
icmp6: neighbor adv: tgt is fdc2:c2cd:d343:39a6:21c:fff:fea6:6348(RSO)(tgt 
lladdr: 00:1c:0f:a6:63:48) [class 0xe0] (len 32, hlim 255)
   0000: 6e00 0000 0020 3aff fdc2 c2cd d343 39a6  n.... :ÿýÂÂÍÓC9¦
   0010: 021c 0fff fea6 6348 fdc2 c2cd d343 39a6  ...ÿþ¦cHýÂÂÍÓC9¦
   0020: 020c 29ff fe20 b1ff 8800 f5e7 e000 0000  ..)ÿþ ±ÿ..õçà...
   0030: fdc2 c2cd d343 39a6 021c 0fff fea6 6348  ýÂÂÍÓC9¦...ÿþ¦cH
   0040: 0201 001c 0fa6 6348                      .....¦cH

10:14:10.753431 00:0c:29:20:b1:ff 00:1c:0f:a6:63:48 86dd 70: 
fdc2:c2cd:d343:39a6:20c:29ff:fe20:b1ff > fdc2:c2cd:d343:39a6:21c:fff:fea6:6348: 
icmp6: echo request (len 16, hlim 64)
   0000: 6000 0000 0010 3a40 fdc2 c2cd d343 39a6  `.....:@ýÂÂÍÓC9¦
   0010: 020c 29ff fe20 b1ff fdc2 c2cd d343 39a6  ..)ÿþ ±ÿýÂÂÍÓC9¦
   0020: 021c 0fff fea6 6348 8000 5833 1e9c 0000  ...ÿþ¦cH..X3....
   0030: 47a3 6172 000b 7499                      G£ar..t.

10:14:10.753926 00:1c:0f:a6:63:48 00:0c:29:20:b1:ff 86dd 70: 
fdc2:c2cd:d343:39a6:21c:fff:fea6:6348 > fdc2:c2cd:d343:39a6:20c:29ff:fe20:b1ff: 
icmp6: echo reply (len 16, hlim 64)
   0000: 6000 0000 0010 3a40 fdc2 c2cd d343 39a6  `.....:@ýÂÂÍÓC9¦
   0010: 021c 0fff fea6 6348 fdc2 c2cd d343 39a6  ...ÿþ¦cHýÂÂÍÓC9¦
   0020: 020c 29ff fe20 b1ff 8100 5733 1e9c 0000  ..)ÿþ ±ÿ..W3....
   0030: 47a3 6172 000b 7499                      G£ar..t.

10:14:11.088588 00:1c:0f:a6:63:48 33:33:00:00:00:05 86dd 90: 
fe80::21c:fff:fea6:6348 > ff02::5:  OSPFv3-hello 36: rtrid 10.57.127.2 backbone 
V6/E/R ifid 0.0.8.186 pri 1 int 10 dead 40 dr 10.57.127.2 nbrs [class 0xe0] 
[hlim 1] (len 36)
   0000: 6e00 0000 0024 5901 fe80 0000 0000 0000  n....$Y.þ.......
   0010: 021c 0fff fea6 6348 ff02 0000 0000 0000  ...ÿþ¦cHÿ.......
   0020: 0000 0000 0000 0005 0301 0024 0a39 7f02  ...........$.9..
   0030: 0000 0000 6e54 0000 0000 08ba 0100 0013  ....nT.....º....
   0040: 000a 0028 0a39 7f02 0000 0000            ...(.9......

10:14:11.760100 00:0c:29:20:b1:ff 00:1c:0f:a6:63:48 86dd 70: 
fdc2:c2cd:d343:39a6:20c:29ff:fe20:b1ff > fdc2:c2cd:d343:39a6:21c:fff:fea6:6348: 
icmp6: echo request (len 16, hlim 64)
   0000: 6000 0000 0010 3a40 fdc2 c2cd d343 39a6  `.....:@ýÂÂÍÓC9¦
   0010: 020c 29ff fe20 b1ff fdc2 c2cd d343 39a6  ..)ÿþ ±ÿýÂÂÍÓC9¦
   0020: 021c 0fff fea6 6348 8000 3450 1e9c 0001  ...ÿþ¦cH..4P....
   0030: 47a3 6173 000b 987a                      G£as...z

10:14:11.760834 00:1c:0f:a6:63:48 00:0c:29:20:b1:ff 86dd 70: 
fdc2:c2cd:d343:39a6:21c:fff:fea6:6348 > fdc2:c2cd:d343:39a6:20c:29ff:fe20:b1ff: 
icmp6: echo reply (len 16, hlim 64)
   0000: 6000 0000 0010 3a40 fdc2 c2cd d343 39a6  `.....:@ýÂÂÍÓC9¦
   0010: 021c 0fff fea6 6348 fdc2 c2cd d343 39a6  ...ÿþ¦cHýÂÂÍÓC9¦
   0020: 020c 29ff fe20 b1ff 8100 3350 1e9c 0001  ..)ÿþ ±ÿ..3P....
   0030: 47a3 6173 000b 987a                      G£as...z

^C
312 packets received by filter
0 packets dropped by kernel