VLL Services
7705 SAR OS Services Guide Page 191
Note that for end-to-end protection, PW redundancy must operate with the multi-chassis
(MC) redundancy feature running on the 7x50 SR nodes.
PW redundancy applies to all VLL services available on the 7705 SAR: Apipe, Cpipe,
Epipe, and Ipipe.
PW Redundancy Operation
PW redundancy on the 7705 SAR is similar to a point-to-multipoint implementation for
PWs (in the ingress to the egress direction). A single SAP can be bound to more than one
spoke SDP; conversely, traffic from multiple spoke SDPs can all be switched to the same
SAP. To implement PW redundancy, a PW service on the 7705 SAR must be able to
accommodate more than one spoke SDP on the spoke SDP side. This is achieved using the
concept of endpoints.
An endpoint can be thought of as a container for a single SAP, a single spoke SDP, or
multiple spoke SDPs. Figure 36 illustrates the model for a redundant VLL service based on
the endpoints. Endpoints are implicit or explicit objects.
Implicit endpoints are transparent to the user and are not user-configurable. As shown in
Figure 36a, implicit endpoints mean that one endpoint is a SAP and another endpoint is a
spoke SDP. Endpoints are considered implicit if the
endpoint command is not used in the
config>service>xpipe>spoke-sdp context, where xpipe refers to any of the VLL
services.
Figure 35: Pseudowire Redundancy
20225
Redundant PWs
Multi-Chassis
Redundancy
7705
RNC
7x50-2
7x50-1
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