Chapter 9: Managing And Monitoring Vpls Domains - Extreme Networks Ridgeline Guide Manual

9
C H A P T E R
A Virtual Private LAN Service (VPLS) domain is a Layer 2 multipoint VPN that allows multiple sites to
be connected in a single bridged domain over a provider-managed IP/MPLS network. VPLS enables
service providers to offer Ethernet private line services that use a simple Layer 2 interface at the
customer edge, and benefit from the resilience and scalability of an MPLS/IP core.
All customer sites in a VPLS domain appear to be on the same LAN, regardless of their locations. A
VPLS-capable network consists of Customer Edge (CE) switches, Provider Edge (PE) switches, and a
core MPLS network.
MPLS pseudo wire (PW) tunnels are logical connections between two LERs over an LSP. Layer 2 VPN
domains are created by adding PWs to each peer LSR to build a fully meshed interconnected VPLS
domain, as shown in Figure
Figure 82: Fully meshed VPLS domain
PE
Core Pseudo Wires
In a fully meshed VPLS domain, pseudo wires must be established between all VPLS peers across the
core. For each peer added to a VPLS domain, a PW is signaled that is used to carry traffic from the local
LSR to the remote peer LSR. Flood traffic from the local service (broadcast, multicast, and unknown
unicast packets) is replicated and forwarded across all PWs in the VPLS domain. Each peer receives one
copy of the packet for delivery to its locally attached service. As MAC learning occurs on PWs, unicast
packets to a known destination MAC address are forwarded to the peer over the PW from which the
MAC address was learned.
Ridgeline Concepts and Solutions Guide
Managing and Monitoring VPLS
Domains
82.
PE
VPLS Core
PE
PE
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