Virtual Leased Line Services
7210 SAS-X, R6 OS Services Guide Page 147
7210 SAS device in standby status according to the SAP in its local MC-LAG instance is capable
of processing packets for a VLL service received over any of the pseudowires which are up. This
is to avoid black holing of user traffic during transitions. The 7210 SAS standby node forwards
these packets to the active node bye the Inter-Chassis Backup pseudowire (ICB pseudowire) for
this VLL service. An ICB is a spoke SDP used by a MC-LAG node to backup a MC-LAG SAP
during transitions. The same ICB can also be used by the peer MC-LAG node to protect against
network failures causing the active pseudowire to go down.
Note that at configuration time, the user specifies a precedence parameter for each of the
pseudowires which are part of the redundancy set as described in the application. A 7210 SAS
node uses this to select which pseudowire to forward packet to in case both pseudowires show
active/active for the local/remote status during transitions.
Only VLL service of type Epipe is supported in this application. Furthermore, ICB spoke SDP can
only be added to the SAP side of the VLL cross-connect if the SAP is configured on a MC-LAG
instance.
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