Cisco ASR 903 Guide

Basic MPLS VPN Configuration
Configuration of BGP and VRF on PE Routers ▀
Cisco ASR 903 Router Design and Deployment Guide▄
OL-30526-01
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Multiplier: 3 - Length: 24
My Discr.: 1 - Your Discr.: 1
Min tx interval: 50000 - Min rx interval: 50000
Min Echo interval: 0
In Cisco IOS XE Release 3.9S, echo function is supported. BFD timer on the Cisco ASR 903 router can be as low
as 3.3ms and timer lower than 50ms can be set by using BFD template.
bfd-template single-hop OSPF-BFD ! created BFD template name OSPF-BFD
interval min-tx 10 min-rx 10 multiplier 3 ! set BFD timer to 10ms
interface GigabitEthernet0/1/1
bfd template OSPF-BFD ! apply template under the interface
Configuration of BGP and VRF on PE Routers
Configuration BGP and VRF are the next steps in MPLS VPN deployment. BGP routing is to ensure that VPNv4
routes can be transported across service provider backbone using MP-iBGP. Virtual Routing and
Forwarding(VRF) is to put different customers into separate VRF instances to provide VPN services.
Table 2. Routing Protocols used between the CEs and PEs
Site
PE-CE Routing Protocol
Route Distinguisher and Route Target
CustomerA Site 1
OSPF
100:41
CustomerB Site 1
ISIS
100:42
CustomerA Site 2
EBGP
100:41
CustomerB Site 2
OSPF
100:42
ASR903-PE1 Configuration
ip vrf CustomerA ! define vrf CustomerA
rd 100:41
route-target export 100:41
route-target import 100:41
!
ip vrf CustomerB ! define vrf CustomerB
rd 100:42
route-target export 100:42
route-target import 100:42
router bgp 100
bgp log-neighbor-changes
neighbor 10.10.4.4 remote-as 100
neighbor 10.10.4.4 update-source Loopback10
!
address-family vpnv4 ! VPN neighbor with ASR903-PE2, M-iBGP
neighbor 10.10.4.4 activate
neighbor 10.10.4.4 send-community extended

Cisco ASR 903 Specifications

General

Brand	Cisco
Model	ASR 903
Category	Network Router
Language	English