Access Multi-Homing For Native Pbb (B-Vpls Over Sap Infrastructure); Figure 114: Access Dual-Homing Into Pbb Bebs - Topology View - Alcatel-Lucent 7750 SR Manual

PBB Features
Access Multi-Homing for Native PBB (B-VPLS over SAP
Infrastructure)
Alcatel-Lucent PBB implementation allows the operator to use a native Ethernet infrastructure as
the PBB core. Native Ethernet tunneling can be emulated using Ethernet SAPs to interconnect the
related B-VPLS instances. This kind of solution might fit certain operational environments where
Ethernet services was provided in the past using QinQ solution. The drawback is that no LDP
signaling is available to provide support for Access Multi-homing for Epipe (pseudowire Active/
Standby status) or I-VPLS services (LDP MAC Withdraw). An alternate solution is required.
A PBB network using Native Ethernet core is depicted in
home a number of edge switches running QinQ to PBB BEBs.
BEB1

Figure 114: Access Dual-Homing into PBB BEBs - Topology View

The interrupted line from the MC-LAG represents the standby, inactive link; the solid line is the
active link. The BEBs are dual-homed to two core switches BCB1 and BCB2 using native
Ethernet SAPs on the B-VPLS side. Multi-point B-VPLS with MSTP for loop avoidance can be
used as the PBB core tunneling. Alternatively point-to-point, G.8031 protected Ethernet tunnels
can be also used to interconnect B-VPLS instances in the BEBs as described in the PBB over
G.8031 protected Ethernet tunnels.
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BCB1 BCB2
MC-LAG
ES11
Figure 114. MC-LAG is used to multi-
BEB - Backbone Edge Bridge
BCB - Backbone Core Bridge
ES - QinQ Access Device
MC-LAG
ESn1
7750 SR OS Services Guide
BEBn
CLI0001B