If LDP signalling is used,
then the pseudowires are signalled as tagged or raw mode Ethernet pseudowires.
Specific rules for LDP signalling are defined next.
PWid FEC A single PW ID is assigned for all pseudowires in the VPLS. Because
there is only one pseudowire between a pair of PEs, each pseudowire may still be
uniquely identified by the PW type, PW ID, and the pair of PEs it interconnects.
Generalized PWid FEC A single AGI is assigned for all pseudowires in the VPLS.
This acts as a VPN identifier and is a unique name for the VPLS. The TAII and SAII
are null, as the VPLS terminates on VSI at each PE rather than on an attachment circuit.
This is rarely, if ever, implemented; however, the Generalized PWid FEC is used in
conjunction with VPLS BGP autodiscovery??”albeit with different FEC encodings (see
???BGP Autodiscovery??? next).
One additional LDP object is defined for VPLS, the MAC list TLV. This may be sent in
an LDP address withdrawal message to indicate a list of MAC addresses for a remote
PE to ???unlearn.??? If the list is empty, then this is taken to mean ???unlearn all MAC addresses
except the ones you learned over this pseudowire.
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