Cisco ASR 903 - Chapter 9 BGP PIC & RFC3107

BGP PIC & RFC3107
▀ BFD Triggered TE Fast Reroute
▄ Cisco ASR 903 Router Design and Deployment Guide
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Chapter 9 BGP PIC & RFC3107
The BGP PIC for IP and MPLS-VPN feature improves BGP convergence after a network failure. This
convergence is applicable to both core and edge failures and can be used in both IP and MPLS networks. The BGP
PIC for IP and MPLS-VPN feature creates and stores a backup/alternate path in the routing information base
(RIB), forwarding information base (FIB), and Cisco Express Forwarding (CEF) so that when a failure is detected,
the backup/alternate path can immediately take over, thus enabling fast failover.
RFC 3107 specifies how to add label information to multiprotocol BGP address families using a subsequent
address family identifier (SAFI). The Cisco IOS implementation of MPLS uses RFC 3107 to provide support for
sending IPv4 routes with a label. VPNv4 routes implicitly have a label associated with each route.
Figure 26. BGP PIC for IPand MPLS-VPN
ASR903-R2
Gi 0/2/3
Gi 0/2/1
Gi 0/2/1
Gi 0/2/3
Gi 0/2/1
Gi 0/2/0
Gi 0/0/0/16
Gi 0/0/0/16
Gi 0/2/0
Gi 0/0/0/17
Gi 0/0/0/18
Gi 0/0/0/17
Gi 0/0/0/18
Gi 0/2/2
Gi 0/2/0
Gi 0/2/2
10.10.1.x
10.10.2.x
10.10.3.x
10.10.4.x
10.10.5.x
10.10.6.x
10.10.7.x
10.10.8.x
(172.16.2.2)
ASR9k-R2
(172.16.22.22)
ASR9k-R1
(172.16.11.11)
ASR903-R3
(172.16.3.3)
(172.16.1.1)
ASR903-R4
(172.16.4.4)
ASR903-R1