Typical BGP Configuration Examples 385
[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
# 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
# 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
Configuring BGP Route
Reflector
Network requirements
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
receives a route update from Switch B, it will transmit such information to Switch
D. It is required to establish an IBGP connection between Switch B and Switch D,
because Switch C reflects information to Switch D.
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