We have a metro-ethernet link between two sites, where our CE are a pair
of 3750G switches. We run q-in-q for a couple of internal things, with
all the L2PT options enabled (cdp, vtp, stp, lacp etc etc). We've found
that even with all that enabled, CDP (for example) doesn't get to the
far end, and it turns out that our MPLS provider's default product
blocks a series of L2 protocols. We see encapsulation counters for L2PT
going up, but 0 for decapsulation.
My question though is: what is L2PT actually doing? My original
assumption was that it was encapsulating these packets in another frame
header, so they would no longer look like STP or CDP or whatever to
intervening devices. That doesn't appear to be the case though, or they
wouldn't get blocked.
Thanks in advance for any illumination...
Howie
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