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BEST PRACTICE: We recommend that you add the route target to both the VPLS

instance's import list and export list of VPN extended communities. To do so, use the

both keyword.

Multiple VPLS instances that use the same transport virtual router cannot have the same

route distinguisher. Conversely, multiple VPLS instances that use different transport

virtual routers can have the same route distinguisher.

For example, the following commands configure the transport virtual router for each of

three VPLS instances: vplsA, vplsB, and vplsC. The transport virtual router for both vplsA

and vplsC is vr1, and the transport virtual router for vplsB is vr2.

host1(config)#bridge vplsA vpls transport-virtual-router vr1

host1(config)#bridge vplsB vpls transport-virtual-router vr2

host1(config)#bridge vplsC vpls transport-virtual-router vr1

Because vplsA and vplsC use the same transport virtual router, vr1, you cannot assign

them the same route distinguisher. Consequently, the following operation fails, and the

router displays an error message.

host1(config)#bridge vplsA vpls rd 1.1.1.1:10

host1(config)#bridge vplsC vpls rd 1.1.1.1:10

% Unable to set VPLS route distinguisher (can't re-use the route-distinguisher)

However, both vplsA and vplsB can use the same route distinguisher because their

transport virtual routers are different. Consequently, the following commands are valid.

host1(config)#bridge vplsA vpls rd 1.1.1.1:10

host1(config)#bridge vplsB vpls rd 1.1.1.1:10

Related Topics Configuring VPLS with BGP Signaling on a PE Router on page 590•

• Configuring VPLS with LDP Signaling on a PE Router on page 602

• bridge vpls rd

• bridge vpls route-target

• bridge vpls site-name site-id

• bridge vpls site-range

• bridge vpls transport-virtual-router

Configuring BGP Multihoming for VPLS

You can configure BGP multihoming in the VPLS network to provide redundancy in the

event of failures such as a PE router-to-CE device link failure, the failure of a PE router,

or an MPLS reachability failure between the local PE router and a remote PE router. BGP

multihoming enables you to connect a customer site to two or more PE routers. A

redundant PE router can begin providing service to the customer site as soon as the failure

is detected. The redundant connectivity maintains the VPLS service and traffic forwarding

to and from the multihomed site while avoiding the formation of layer 2 traffic loops.

JunosE 11.2.x BGP and MPLS Configuration Guide

Juniper JUNOSE 11.2.X BGP AND MPLS User Manual

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