User guide

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13-5
BGP F
EATURES
Figure 13-2: 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. Using the confederation, AS 200 is
split into two sub-ASs: AS65001 and AS65002. Each sub-AS is fully meshed, and IBGP is
running among its members. EBGP is used between sub-AS 65001 and sub-AS 65002.
Router B and Router D are EBGP peers. EBGP is also used between the confederation
and outside ASs.
To configure Router A, use the following commands:
create vlan ab
config vlan ab add port 1
config vlan ab ipaddress 192.1.1.6/30
enable ipforwarding vlan ab
config ospf add vlan ab area 0.0.0.0
create vlan ac
config vlan ac add port 2
config vlan ac ipaddress 192.1.1.17/30
EW_049
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