3com 3.01.01 User Manual

C

HAPTER

 5: IP R

OUTING

 P

ROTOCOL

 O

PERATION

Figure 13   AS Confederation Configuration

To configure the AS confederation:

1 Configure Switch A:

[Switch A]bgp 1001

[Switch A-bgp]confederation id 100

[Switch A-bgp]confederation peer-as 1002 1003

[Switch A-bgp]group confed1002 external

[Switch A-bgp]peer confed1002 as-number 1002

[Switch A-bgp]group confed1003 external

[Switch A-bgp]peer confed1003 as-number 1003

[Switch A-bgp]peer 172.68.10.2 group confed1002 

[Switch A-bgp]peer 172.68.10.3 group confed1003

2 Configure Switch B:

[Switch B]bgp 1002

[Switch B-bgp]confederation id 100

[Switch B-bgp]confederation peer-as 1001 1003

[Switch B-bgp]group confed1001 external

[Switch B-bgp]peer confed1001 as-number 1001

[Switch B-bgp]group confed1003 external

[Switch B-bgp]peer confed1003 as-number 1003

[Switch B-bgp]peer 172.68.10.1 group confed1001

[Switch B-bgp]peer 172.68.10.3 group confed1003

3 Configure Switch C:

[Switch C]bgp 1003

[Switch C-bgp]confederation id 100

[Switch C-bgp]confederation peer-as 1001 1002

[Switch C-bgp]group confed1001 external

[Switch C-bgp]peer confed1001 as-number 1001

[Switch C-bgp]group confed1002 external

[Switch C-bgp]peer confed1002 as-number 1002

[Switch C-bgp]peer 172.68.10.1 group confed1001

[Switch C-bgp]peer 172.68.10.2 group confed1002

[Switch C-bgp]group ebgp200 external

[Switch C-bgp]peer 156.10.1.2 group ebgp200 as-number 200

[Switch C-bgp]group ibgp1003 internal

[Switch C-bgp]peer 172.68.1.2 group ibgp1003

Switch B receives an update packet passing EBGP and transmits it to Switch C. 
Switch C is a reflector with two clients: Switch B and Switch D. When Switch C 

AS200

AS100

AS1002

AS1001

AS1003

Ethernet

172.68.10.1

172.68.10.2

172.68.10.3

172.68.1.2

172.68.1.1

156.10.1.1

156.10.1.2

Switch A

Switch B

Switch C

Switch D

Switch E