2-
In both TRILL and IEEE, control packets can be lost because of
additional encapsulation overhead. In TRILL, LSPs that exceed 1500
bytes will be lost with indeterministic effect on the network
and in IEEE MVRP, MMRP, and other control packets that exceed 1500
bytes will be lost with undesirable effect on the
network
Again worlds apart. IEEE Provider Backbone Bridging was prototyped,
deployed and standardized without any fanfare on this issue. IEEE 802.3as was
a proactive increase in the IEEE minimum frames size to support a future where
multiple encapsulation of the PBB variety could be envisioned and still
support the 1500 limit. There is no law that say you cannot break your
network with certain configurations but if that network breaks it should do so
gracefully.
You are missing the point in there - we are not talking about BEBs
but BCBs. BCB bridges are supposed to be standard s-vlan aware bridges which
can be limited to 1516 or 1522 bytes in frame-size handling !! So, the
problem that I describe above can easily happen.
Cheers,
Ali