Virtual Private LAN Services
7210 SAS M Services Guide Page 275
Inter-Domain VPLS Resiliency Using Multi-Chassis Endpoints
Note: MC-EP is not supported in 7210 SAS devices. This section serves to provide an example on
how 7210 SAS devices can be used as a MTUs device in an MC-EP solution. In this solution the
7750 SR routers provide the MC-EP functionality.
Inter-domain VPLS refers to a VPLS deployment where sites may be located in different domains.
An example of inter-domain deployment can be where different Metro domains are interconnected
over a Wide Area Network (Metro1-WAN-Metro2) or where sites are located in different
autonomous systems (AS1-ASBRs-AS2).
Multi-chassis endpoint (MC-EP) provides an alternate solution that does not require RSTP at the
gateway VPLS PEs while still using pseudowires to interconnect the VPLS instances located in
the two domains.
MC-EP expands the single chassis endpoint based on active-standby pseudowires for VPLS
shown in Figure 43. In the solution depicted by the Figure 43, 7210 devices are used as MTUs.
Figure 43: HVPLS Resiliency Based on AS Pseudowires
The active-standby pseudowire solution is appropriate for the scenario when only one VPLS PE
(MTU-s) needs to be dual-homed to two core PEs (PE1 and PE2).
OSSG249
HVPLS Resiliency
VPLS
(Mesh)
MTUs
PE1
PE2
EP
Active PW
Standby PW
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