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.
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 the local end of the pseudowire. This should be locally unique within the scope of the global-id:prefix.