Cisco ASR 9000 Series Configuration Guidelines

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

Cisco ASR 9000 Series Specifications

General

Series	ASR 9000
Category	Network Router
Modular Design	Yes
Redundancy	Yes (Hardware and Software)
Operating System	Cisco IOS XR
Interfaces/Ports	10G, 40G, 100G, 400G Ethernet
Expansion Slots	Varies by model
Routing Protocol	BGP, OSPF, IS-IS, EIGRP
Management	CLI, SNMP, NETCONF
Power Supply	Redundant
Port Density	Varies by model
Power Supply Options	AC, DC
Memory	Varies by model
Storage	Varies by model
Dimensions	Varies by model
Weight	Varies by model