Introduction To Configuring Vpls - Juniper ACX1000 Configuration Manual

ACX Series Universal Access Router Configuration Guide

Introduction to Configuring VPLS

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VPLS, in its implementation and configuration, has much in common with a Layer 2 VPN.
In VPLS, a packet originating within a service provider customer's network is sent first to
a customer edge (CE) device (for example, a router or Ethernet switch). It is then sent
to a provider edge (PE) router within the service provider's network. The packet traverses
the service provider's network over a MPLS label-switched path (LSP). It arrives at the
egress PE router, which then forwards the traffic to the CE device at the destination
customer site.
NOTE: In the VPLS documentation, the word router in terms such as PE router
is used to refer to any device that provides routing functions.
The difference is that for VPLS, packets can traverse the service provider's network in
point-to-multipoint fashion, meaning that a packet originating from a CE device can be
broadcast to all the PE routers participating in a VPLS routing instance. In contrast, a
Layer 2 VPN forwards packets in point-to-point fashion only.
The paths carrying VPLS traffic between each PE router participating in a routing instance
are called pseudowires. The pseudowires are signaled using either BGP or LDP.
Virtual private LAN service (VPLS) allows you to provide a point-to-multipoint LAN
between a set of sites in a virtual private network (VPN).
NOTE: In ACX Series routers, VPLS configuration is supported only on
ACX5048 and ACX5096 routers.
To configure VPLS functionality, you must enable VPLS support on the provider edge
(PE) router. You must also configure PE routers to distribute routing information to the
other PE routers in the VPLS and configure the circuits between the PE routers and the
customer edge (CE) routers.
NOTE: In the VPLS documentation, the word router in terms such as PE router
is used to refer to any device that provides routing functions.
Each VPLS is configured under a routing instance of type
can transparently carry Ethernet traffic across the service provider's network. As with
other routing instances, all logical interfaces belonging to a VPLS routing instance are
listed under that instance.
In addition to VPLS routing instance configuration, you must configure MPLS
label-switched paths (LSPs) between the PE routers, IBGP sessions between the PE
routers, and an interior gateway protocol (IGP) on the PE and provider (P) routers.
By default, VPLS is disabled.
. A routing instance
vpls vpls
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