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 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 SAII and a 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
The global ID is a 4-byte identifier that uniquely identifies an operator or the local network.
prefix
This is 4-byte prefix, which should correspond to one of the local prefixes assigned under pw-routing.
AC ID
The AC ID is a 4-byte identifier for this end of the pseudowire. This should be locally unique within the scope of the global-id:prefix.