Virtual Private LAN Services
7210 SAS-X, R6 OS Services Guide Page 273
The generalized pseudowire-ID FEC element has been designed for auto discovery applications. It
provides a field, the address group identifier (AGI), that is used to signal the membership
information from the VPLS-ID. Separate address fields are provided for the source and target
address associated with the VPLS endpoints called the Source Attachment Individual Identifier
(SAII) and respectively, Target Attachment Individual Identifier (TAII). These fields carry the VSI
ID values for the two instances that are to be connected through the signaled pseudowire.
The detailed format for FEC 129 is depicted in Figure 37.
Figure 37: Generalized Pseudowire-ID FEC Element
Each of the FEC fields are designed as a sub-TLV equipped with its own type and length
providing support for new applications. To accommodate the BGP AD information model the
following FEC formats are used:
• AGI (type 1) is identical in format and content with the BGP extended community
attribute used to carry the VPLS-ID value.
• Source AII (type 1) is a 4 bytes value destined to carry the local VSI-id (outgoing NLRI
minus the RD).
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