Figure 29: Access Node Resilience - Alcatel-Lucent 7210 SAS M Service Manual

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In this application, a new pseudowire status bit of active or standby indicates the status of the SAP

in the MC-LAG instance in the SR-Series aggregation node. All spoke SDPs are of secondary type

and there is no use of a primary pseudowire type in this mode of operation. Node A is in the active

state according to its local MC-LAG instance and thus advertises active status notification

messages to both its peer pseudowire nodes, for example, nodes C and D. Node D performs the

same operation. Node B is in the standby state according to the status of the SAP in its local MC-

LAG instance and thus advertises standby status notification messages to both nodes C and D.

Node C performs the same operation.

The 7210 SAS node selects a pseudowire as the active path for forwarding packets when both the

local pseudowire status and the received remote pseudowire status indicate active status. However,

7210 SAS device in standby status according to the SAP in its local MC-LAG instance is capable

7210 SAS M Services Guide

Inter-chassis

Inter-chassis