Additional
optional interface parameters are also carried in FEC 128 (for example, the maximum
frame size that will be transported across the pseudowire). In this model, a pseudowire
is uniquely identified by the PW type, PW ID, and the pair of PEs at either end of the
pseudowire.
Generalized PWid FEC The generalized PWid FEC (also known as ???FEC 129???) was
added in a later revision of draft-martini and provides for a range of provisioning models.
Instead of a unique identifier for each pseudowire, this model creates unique identifiers
for the attachment circuits at either end of the pseudowire. These are structured
as an Attachment Group Identifier (AGI) that must match between both ends of a circuit
and an individual identifier. The FEC consists of the AGI plus Source and Target
individual identifiers (SAII and TAII). A sent FEC matches a received FEC if the AGIs
match and if the TAII of each matches the SAII of the other. Two additional objects are
signalled along with FEC 129, the PW grouping TLV (which is analogous to the Group
ID in FEC 128) and the interface parameters TLV (which is analogous to the interface
parameters in FEC 128).
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