Alcatel-Lucent 7750 SR OS - Pseudowire Redundancy Service Models; Redundant VLL Service Model; Figure 27: Redundant VLL Endpoint Objects

Virtual Leased Line Services
7750 SR OS Services Guide Page 137
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. The selection rules for the active transmit endpoint object are detailed in Section VLL
Endpoint Active Transmit Object Selection Rules.
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 27 illustrates the model for a redundant
VLL service based on the concept of endpoints.
Figure 14: 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. Let's refer to them as
endpoint 'X' and endpoint 'Y' as illustrated in Figure 27.
SAP
Spoke-SDP
VLL
Endpoint X Endpoint Y
ICB
spoke-sdp
Sp o k e- SD P
Spoke-SDP
Sp o k e- SD P