Cisco Cisco IOS Software Release 12.0(23)S

This section provides the following configuration examples:

 shows two MPLS VPN service providers. They distribute VPNv4 addresses between the route 

reflectors and IPv4 routes and MPLS labels between ASBRs. 

The configuration example shows the two techniques you can use to distribute the VPNv4 routes and the 
IPv4 routes and MPLS labels of remote PEs and RRs to local PEs and RRs: 

AS 100 uses the route reflectors to distribute the IPv4 routes and MPLS labels and the VPNv4 routes 
from the ASBR to the PE. 

In AS 200, the IPv4 routes that ASBR2 learned are redistributed into IGP. 

The configuration example for RR1 specifies the following: 

RR1 exchanges VPNv4 routes with RR2, using multiprotocol, multihop EBGP. 

The VPNv4 next hop information and the VPN label are preserved across the autonomous systems. 

RR1 reflects to PE1 the VPNv4 routes learned from RR2 and the IPv4 routes and MPLS labels 
learned from ASBR1. 

aa.aa

RR1

AS 100

AS 200

PE1

ee.ee

P1

CE1

oo.oo

CE2

nn.nn

PE2

ff.ff

bb.bb

RR2

ASBR1

ww.ww

ASBR2

xx.xx

Multihop

Multiprotocol

EBGP

exchange

IPv4 BGP +

labels exchange

with multipath

support

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