Cisco CRS Configuration Manual page 201
Ios xr virtual private network
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Implementing MPLS Layer 3 VPNs
not forward the next-hop-self address. Each subautonomous system runs as a single IGP domain. However,
the CEBGP border edge router addresses are known in the IGP domains.
• Configure a router to forward next-hop-self addresses between the CEBGP border edge routers (both
directions) and within the iBGP peers at the subautonomous system border. Each subautonomous system
runs as a single IGP domain but also forwards next-hop-self addresses between the PE routers in the
domain. The CEBGP border edge router addresses are known in the IGP domains.
eBGP Connection Between Two Subautonomous Systems in a Confederation figure illustrates how two
Note
autonomous systems exchange routes and forward packets. Subautonomous systems in a confederation
use a similar method of exchanging routes and forwarding packets.
The figure below illustrates a typical MPLS VPN confederation configuration. In this configuration:
• The two CEBGP border edge routers exchange VPN-IPv4 addresses with labels between the two
autonomous systems.
• The distributing router changes the next-hop addresses and labels and uses a next-hop-self address.
• IGP-1 and IGP-2 know the addresses of CEBGP-1 and CEBGP-2.
Figure 34: eBGP Connection Between Two Subautonomous Systems in a Confederation
In this confederation configuration:
• CEBGP border edge routers function as neighboring peers between the subautonomous systems. The
subautonomous systems use eBGP to exchange route information.
• Each CEBGP border edge router (CEBGP-1 and CEBGP-2) assigns a label for the router before
distributing the route to the next subautonomous system. The CEBGP border edge router distributes the
Cisco IOS XR Virtual Private Network Configuration Guide for the Cisco CRS Router, Release 6.1.x
Confederations
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