Alcatel-Lucent 7750 - Point-To-Point (P2 P) Redundant Connection Across Layer 2;3 VPN Network; Figure 29: P2 P Redundant Connection through a Layer 2 VPN Network

Multi-Chassis LAG
Page 144 7750 SR Interface Configuration Guide
Point-to-Point (p2p) Redundant Connection Across Layer 2/3 VPN Network
Figure 29: P2P Redundant Connection Through a Layer 2 VPN Network
Figure 29 shows the connection between two multi-service access nodes (MSANs) across network
based on Layer 2/3 VPN pseudo-wires. The connection between MSAN and a pair of PE routers is
realized by MC-LAG. From MSAN perspective, redundant pair of PE routers acts as a single
partner in LACP negotiation. At any point in time, only one of the routers has an active link(s) in a
given LAG. The status of LAG links is reflected in status signaling of pseudo-wires set between all
OSSG116
Aggregation
node
A
Aggregation
node
C
MSANMSAN
Aggregation
node
B
Aggregation
node
C
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
C
Inter-chassis
PW for VLL
Active
Standby
Standby
TLDP
Active
Inter-chassis
PW for VLL