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1. T-LDP peer (remote PE) node withdrew the pseudowire label.
2. T-LDP peer signaled a FEC status indicating a pseudowire failure or a remote SAP failure.
3. T-LDP session to peer node times out.
4. SDP binding and VLL service went down as a result of network failure condition such as the
SDP to peer node going operationally down.
The SDP type for the primary and secondary pseudowires need not be the same. In other words,
the user can protect a RSVP-TE based spoke SDP with a LDP or GRE based one. This provides
the ability to route the path of the two pseudowires over different areas of the network. All VLL
service types, for example, Apipe, Epipe, Fpipe, and Ipipe are supported.
Alcatel-Lucent’s routers support the ability to configure multiple secondary standby pseudowire
paths. For example, PE1 uses the value of the user configurable precedence parameter associated
with each spoke SDP to select the next available pseudowire path after the failure of the current
active pseudowire (whether it is the primary or one of the secondary pseudowires). The revertive
operation always switches the path of the VLL back to the primary pseudowire though. There is no
revertive operation between secondary paths meaning that the path of the VLL will not be
switched back to a secondary pseudowire of higher precedence when the latter comes back up
again.
Alcatel-Lucent’s routers support the ability for a user-initiated manual switchover of the VLL path
to the primary or any of the secondary be supported to divert user traffic in case of a planned
outage such as in node upgrade procedures.
This application can make use of all types of VLL supported on SR-Series routers. A SAP can be
configured on SONET/SDH port which is part of an APS group. However, if a SAP is configured
on a MC-LAG instance, only the Epipe service type is allowed.
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