One or more spoke SDPs may be configured for distributed Epipe VLL services. Dynamic MS-PWs use FEC129 (also known as the Generalized ID FEC) with Attachment Individual Identifier (AII) Type 2 to identify the pseudowire, as opposed to FEC128 (also known as the PW ID FEC) used for traditional single segment pseudowires and for pseudowire switching. FEC129 spoke SDPs are configured under the spoke-sdp-fec command in the CLI.
FEC129 AII Type 2 uses a Source Attachment Individual Identifier (SAII) and a Target Attachment Individual Identifier (TAII) to identify the end of a pseudowire at the T-PE. The SAII identifies the local end, while the TAII identifies the remote end. The SAII and TAII are each structured as follows:
Global-ID
This is a 4 byte identifier that uniquely identifies an operator or the local network.
Prefix
A 4-byte prefix, which should correspond to one of the local prefixes assigned under pw-routing.
AC-ID
A 4-byte identifier for this end of the pseudowire. This should be locally unique within the scope of the global-id:prefix.