Virtual Leased Line Services
7210 SAS-X, R6 OS Services Guide Page 137
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.
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.
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