Virtual Leased Line Services
7750 SR OS Services Guide Page 229
Pseudowire Redundancy Service Models
This section describes the various MC-LAG and 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 51 illustrates the model for a redundant
VLL service based on the concept of endpoints.
Figure 51: 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.
OSSG211
VLL
Endpoint X Endpoint Y
SAP
ICB
spoke-sdp
Spoke-SDP
Spoke-SDP
Spoke-SDP
Spoke-SDP
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