Chapter 13: Mpls Ip Vpn And Ip Vpn Lite; Mpls Ip Vpn; Mpls Overview - Avaya 8800 Planning And Engineering, Network Design

Chapter 13: MPLS IP VPN and IP VPN Lite

The Avaya Ethernet Routing Switch 8800/8600 supports Multiprotocol Label Switching (MPLS) and
IP Virtual Private Networks (VPN) to provide fast and efficient data communications. In addition, to
support IP VPN capabilities without the complexities associated with MPLS deployments, the
Ethernet Routing Switch 8800/8600 supports IP VPN Lite.
Use the design considerations provided in this section to help you design optimum MPLS IP VPN,
and IP VPN Lite networks.

MPLS IP VPN

Beginning with Release 5.0, the Avaya Ethernet Routing Switch supports MPLS networking based
on RFC 4364 (RFC 4364 obsoletes RFC 2547). RFC 4364 describes a method by which a Service
Provider can use an IP backbone to provide IP Virtual Private Networks (VPNs) for its customers.
This method uses a peer model, in which the customer's edge routers (CE routers) send their routes
to the service provider's edge routers (PE routers). Data packets are tunneled through the
backbone, so that the core routers (P routers) do not need to know the VPN routes. This means that
the P routers can scale to an unlimited number of IP VPNs and also that no configuration change is
required on the P nodes when IP VPN services are added or removed. VPN routes are exchanged
between PE routers using Border Gateway Protocol (BGP) with Multiprotocol extensions (BGP-MP).
There is no requirement for the CE routers at different sites to peer with each other or to have
knowledge of IP Virtual Private Networks (VPNs) across the service provider's backbone. The CE
device can also be a Layer 2 switch connected to the PE router.
RFC 4364 defines a framework for layer 3 VPNs over an IP backbone with BGP. It is commonly
deployed over MPLS but can use IPSec or GRE tunnels.
Avaya IP-VPN uses MPLS for transport.

MPLS overview

Multi-Protocol Label Switching (MPLS) (RFC3031) is primarily a service provider technology where
IP traffic can be encapsulated with a label stack and then label switched across a network through
Label Switched Routers (LSR) using Label Switched Paths (LSP). An LSP is an end-to-end
unidirectional tunnel set up between MPLS-enabled routers. Data travels through the MPLS network
over LSPs from the network ingress to the network egress. The LSP is determined by a sequence of
June 2016 Planning and Engineering — Network Design
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