Specifying An Interface As The Active Interface; Configuring Multihoming On The Pe Router - Juniper ACX1000 Configuration Manual

ACX Series Universal Access Router Configuration Guide
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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:
Specifying an Interface as the Active Interface on page 1270
Configuring Multihoming on the PE Router on page 1270

Specifying an Interface as the Active Interface

You need to specify one of the interfaces for the multihomed site as the primary interface.
If there are multiple interfaces, the remaining interfaces are activated only when the
primary interface goes down. If no active interfaces are configured at the site level, all
traffic for a VPLS site travels through a single, non-multihomed PE router.
You must configure one of the following options for the
any —One configured interface is randomly designated as the active interface for the
VPLS site.
—Specify the name of the multihomed interface to be used as the primary
primary
interface by the VPLS site.
To specify a multihomed interface as the primary interface for the VPLS site, include the
active-interface statement:
active-interface {
any;
primary interface-name;
}
You can include this statement at the following hierarchy levels:
[edit routing-instances routing-instance-name protocols vpls site site-name]
[edit logical-systems logical-system-name routing-instances routing-instance-name
protocols vpls site site-name]

Configuring Multihoming on the PE Router

When a CE device is connected to the same VPLS site on more than one PE router,
including the
multi-homing
BGP peers. If no BGP peer is available, VPLS deactivates all active interfaces for a site.
When two PE routers use the same site ID, VPLS assumes multihoming behavior by
default. The site preference value is used to signal the primary and backup PE router. In
such cases, when multihoming is explicitly configured using the
, it is only used for tracking the BGP peer status, such as to prevent isolation of the PE
router from the core or split brain.
statement on all associated PE routers results in tracking of
statement:
active-interface
multi-homing statement
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