Virtual Leased Line Services
7210 SAS M Services Guide Page 155
Pseudowire Redundancy Service Models
This section describes the pseudowire redundancy scenarios as well as the algorithm used to select
the active transmit object in a VLL endpoint.
The redundant VLL service model is described in the following section, Redundant VLL Service
Model.
Redundant VLL Service Model
In order to implement pseudowire redundancy, a VLL service accommodates more than a single
object on the SAP side and on the spoke SDP side. Figure 28 illustrates the model for a redundant
VLL service based on the concept of endpoints.
Figure 28: Redundant VLL Endpoint Objects
A VLL service supports by default two implicit endpoints managed internally by the system. Each
endpoint can only have one object, a SAP or a spoke SDP.
In order to add more objects, up to two (2) explicitly named endpoints may be created per VLL
service. The endpoint name is locally significant to the VLL service. They are referred to as
endpoint 'X' and endpoint 'Y' as illustrated in Figure 28.
VLL
Endpoint X Endpoint Y
SAP Spoke-SDP
Spoke-SDP
Spoke-SDP
Spoke-SDP
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