[c-nsp] Weird problem w/ packet loss on QinQ ports

[Garry]

One addendum - I've just removed the 4507 from the network, hooking up
the ME3400's back-to-back ... turns out the packet loss is gone, so it
must be something with the 4507 -- is there anything additional that
needs to be configured so that QinQ encapsulated traffic passes through
correctly?

I activated l2protocol tunneling on the 4507 for testing purposes, that
also works flawlessly, showing the remote neighbor instead of the 4507
...but still, all double-tagged packets cause packet loss ...

Any ideas?

Tnx, -garry