Migration from a full iBGP mesh may be tricky as all the routers must be configured at one time

bgp confederation identifier realASN

bgp confederation peers otherASNs

0901_04F9_c3

Internet Connectivity

Multi-Level Hierarchy

Policy Control

Confederations

Anywhere in the Network

Yes

Connections

Only in the Core

Yes

Yes

IGP

Migration Complexity

One

Instance

M

ledium

Across the

t

o High

Network

May Need Different Instances in Each Region

M

ow to edium

Scalability and Stability Achieved by Both Methods!!

0901_04F9_c3 © 1999, Cisco Systems, Inc. WWW.CltDfl.CU ttl 33

• Provide additional control to allow router to advertise (reflect) iBGP learned routes to other iBGP peers

Method to reduce the size of the iBGP mesh

• Normal BGP speakers can coexist

Only the RR has to support this feature neighbor x.x.x.x route-reflector-client

0901_04F9_c3 © 1999, Cisco Systems, Inc. WWW.niCil.CUftt 35

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