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VPLS Multihomed Site Configuration

The following describes the requirements for a VPLS multihomed site configuration:

Assign the same site ID on all PE routers connected to the same CE devices.
Assign the same route distinguisher on all PE routers connected to the same CE devices.
Reference all interfaces assigned to the multihomed VPLS site on each PE router. Only one of these interfaces is used to send and receive traffic for this site at a time.
Either designate a primary interface or allow the router to select the interface to be used as the primary interface.
If the router selects the interface, the interface used to connect the PE router to the site depends on the order in which interfaces are listed in the PE router’s configuration. The first operational interface in the set of configured interfaces is chosen to be the designated interface. If this interface fails, the next interface in the list is selected to send and receive traffic for the site.
Configure multihoming for the site.

The following configuration shows the statements you need to configure to enable VPLS multihoming:



[edit routing-instances routing-instance-name]
instance-type vpls;
interface interface-name;
interface interface-name;
protocols vpls {



site site-name {



active-interface {
any;
primary interface-name;
}



interface interface-name;

interface interface-name;

multi-homing;

site-identifier number;
}


}

route-distinguisher (as-number:id | ip-address:id);

Note: If you add a direct connection between CE devices that are multihomed to the same VPLS site on different PE routers, the traffic can loop and a loss of connectivity might occur. We do not recommend this topology.

Most of these statements are explained in more detail in the rest of this chapter. The following sections explain how to configure the statements that are specific to VPLS multihoming:

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