Figure 23: NLRI and Extended Communities
Service Path Preference for L2VPN
Service Path Preference feature (SPP) helps control transport path for L2VPN services in traffic engineering
(TE) tunnels. SPP feature provides a way for services to influence path selection while forwarding in
Multiprotocol Label Switching (MPLS) networks. SPP is achieved by associating a control plane policy with
a forward-class. SPP is supported for per-service path selection for VPLS with BGP AD, and EVI for
PBB-EVPN and EVPN.
SPP for L2VPN is implemented in two steps:
• Path selection - classify incoming traffic on a per service basis.
• Path setup - set up paths with forward-class service.
Refer to Service Path Preference for MPLS VPN Sessions module for more information on SPP.
Understanding How Service Path Preference Works
SPP allows services to select a path based on policies configured in the control plane.
Consider a scenario where you have two Provider Edge (PE) routers in a setup. PE1 functions as ingress node
and PE2 functions as egress node.
L2VPN and Ethernet Services Configuration Guide for Cisco ASR 9000 Series Routers, IOS XR Release 6.3.x
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Implementing Multipoint Layer 2 Services
Service Path Preference for L2VPN
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