Dslam Dual Homing In Layer 2/3 Tpsda Model; Figure 30: Dslam Dual-Homing Using Mc-Lag - Alcatel-Lucent 7750 Configuration Manual

Multi-Chassis LAG

DSLAM Dual Homing in Layer 2/3 TPSDA Model

Figure 30
PEs by using MC-LAG. Inside the aggregation network redundant-pair of PEs is connecting to
VPLS service which provides reliable connection to single or pair of Broadband Service Routers
(BSRs).
MC-LAG and pseudo-wire connectivity, PE-A and PE-B implement enhanced subscriber
management features based on DHCP-snooping and creating dynamic states for every subscriber-
host. As in any point of time there is only one PE active, it is necessary to provide the mechanism
for synchronizing subscriber-host state-information between active PE (where the state is learned)
and stand-by PE. In addition, VPLS core must be aware of active PE in order to forward all
subscriber traffic to a PE with an active LAG link. The mechanism for this synchronization is
outside of the scope of this document.
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HGW
DSLAM
HGW

Figure 30: DSLAM Dual-Homing Using MC-LAG

illustrates a network configuration where DSLAM is dual homed to pair of redundant
PE-A
VPLS
Synchronise
DHCP-state
IGMP-snooping
Arp-reply-agent
PE-B
response
7750 SR Interface Configuration Guide
BSR
OSSG110