[c-nsp] Cisco 4900M and QinQ

[Sebastian Wiesinger]

Hi,

has anyone a working QinQ tunnel on a Cisco 4900M? I tried it in the
lab with 12.2(50)SG Enterprise Services SSH and it didn't work.

Setup like this:

[Node 1]---trunk---[4900M]===dot1q-tunnel===[3550]---trunk---[Node 2]

l2protocol-tunnel enabled for cdp/stp/vtp

The symptoms were:

Node 1 has the mac-address of Node 2 in the cam table.
Node 2 DOESN'T have the mac-address of Node 1.

The cam table on the 4900M doesn't show any entries on the
dot1q-tunnel interface to Node 1.

The funny thing:

Node 1 DOESN'T have a cdp neighbor entry for Node 2.
Node 2 does have a cdp neighbor entry for Node 1.

This is the opposite to the mac address symtoms. :)

Consequently a ping between the two nodes times out.

Can anyone confirm this? When I replace the 4900M with a 3550 the QinQ
works instantly.

Kind Regards,

Sebastian

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