Alcatel-Lucent 7750 SR - Access Node Resilience Using MC-LAG and Pseudowire Redundancy; Figure 49: Access Node Resilience

Virtual Leased Line Services
7750 SR OS Services Guide Page 225
Access Node Resilience Using MC-LAG and Pseudowire
Redundancy
Figure 49 shows the use of both Multi-Chassis Link Aggregation (MC-LAG) in the access
network and pseudowire redundancy in the core network to provide a resilient end-to-end VLL
service to the customers.
Figure 49: Access Node Resilience
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
OSSG116
Aggregation
node
A
Aggregation
node
C
MSANMSAN
Aggregation
node
B
Aggregation
node
D
Inter-chassis
PW for VLL
Active
Active
Active
Active
Standby
Standby
Standby
Standby
Standby
TLDP
Standby Active
Active
Inter-chassis
PW for VLL
Aggregation
node
A
Aggregation
node
C
MSANMSAN
Aggregation
node
B
Aggregation
node
D
Inter-chassis
PW for VLL
Active
Standby
Standby
TLDP
Active
Inter-chassis
PW for VLL