l2protocol-tunnel 0 decap

Gurus,

Anyone ever had a problem with Q-inQ and l2tunnel-protocol where both
ends show encaps but zero decaps? The tunnel ports are configured thus:

interface TenGigabitEthernet8/2
  description XXX
  switchport
  switchport access vlan 421
  switchport mode dot1q-tunnel
  mtu 9216
  l2protocol-tunnel cdp
  l2protocol-tunnel stp
  no cdp enable
end

The Q-inQ ports are configured thus:

interface TenGigabitEthernet8/1
  description XXX
  switchport
  switchport trunk encapsulation dot1q
  switchport trunk allowed vlan 421
  switchport mode trunk
  mtu 9216
end

The output from show l2p is...thus:

Port Protocol Thresholds Counters
                              Shutdown Drop Encap Decap
Drop
------------------- -------- --------- --------- --------- ---------
---------
Te8/2 cdp ---- ---- 200188
0 0
                     --- ---- ---- ----
---- ----
                     stp ---- ---- 5385679
0 0
                     --- ---- ---- ----
---- ----

Any ideas?

System mtu is set for jumbo frames and the Q-in-Q is up and devices at
either end can see each other nicely - it's just the l2tunnel which is
broken. I appreciate it's vague and I may be running down a rat hole
here but could this be to do with the multicast mash which goes on?

Any help gratefully received.

Rich

Blogs and organic groups at http://www.ccie.net
Received on Thu Oct 08 2009 - 04:21:03 ART