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Intel
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NetStructure™ 480T Routing Switch User Guide
Route Confederations
BGP requires networks to use a fully-meshed router configuration.
This requirement does not scale well, especially when BGP is used
as an interior gateway protocol.
One way to reduce the size of a fully-meshed AS is to divide the AS
into multiple sub-autonomous systems and group them into a
routing confederation. Within the confederation, each sub-AS must
be fully meshed. The confederation is advertised to other networks
as a single AS.
Route Confederation Example
Figure 14.2 shows an example of a confederation.
Figure 14.2: Routing confederation
In this example, AS 200 has five BGP speakers. Without a
confederation, BGP would require that the routes in AS 200 be fully
meshed.
480T_049T
EBGP
SubAS 65001
SubAS 65002
EBGP
AS 200
IBGP
IBGP
AB
C
192.1.1.6/30 192.1.1.5/30 192.1.1.9/30
192.1.1.17/30
192.1.1.18/30
192.1.1.21/30
192.1.1.22/30
DE
192.1.1.13/30
192.1.1.10/30
192.1.1.14/30
EBGP
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13 161514
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3421
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11 12109
13 161514
87654321
161514131211109
Rx TxRx TxRx TxRx Tx
3421
7865
11 12109
13 161514
87654321
161514131211109
Rx TxRx TxRx TxRx Tx
3421
7865
11 12109
13 161514
87654321
161514131211109
Rx TxRx TxRx TxRx Tx
3421
7865
11 12109
13 161514
87654321
161514131211109
Rx TxRx TxRx TxRx Tx