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Configuration procedure
1. Configure IP addresses for interfaces. (Details not shown.)
2. Configure IBGP:
# Configure Switch B.
<SwitchB> system-view
[SwitchB] bgp 65009
[SwitchB-bgp-default] router-id 2.2.2.2
[SwitchB-bgp-default] peer 3.3.3.3 as-number 65009
[SwitchB-bgp-default] peer 3.3.3.3 connect-interface loopback 0
[SwitchB-bgp-default] address-family ipv4 unicast
[SwitchB-bgp-default-ipv4] peer 3.3.3.3 enable
[SwitchB-bgp-default-ipv4] quit
[SwitchB-bgp-default] quit
[SwitchB] ospf 1
[SwitchB-ospf-1] area 0
[SwitchB-ospf-1-area-0.0.0.0] network 2.2.2.2 0.0.0.0
[SwitchB-ospf-1-area-0.0.0.0] network 9.1.1.0 0.0.0.255
[SwitchB-ospf-1-area-0.0.0.0] quit
[SwitchB-ospf-1] quit
# Configure Switch C.
<SwitchC> system-view
[SwitchC] bgp 65009
[SwitchC-bgp-default] router-id 3.3.3.3
[SwitchC-bgp-default] peer 2.2.2.2 as-number 65009
[SwitchC-bgp-default] peer 2.2.2.2 connect-interface loopback 0
[SwitchC-bgp-default] address-family ipv4 unicast
[SwitchC-bgp-default-ipv4] peer 2.2.2.2 enable
[SwitchC-bgp-default-ipv4] quit
[SwitchC-bgp-default] quit
[SwitchC] ospf 1
[SwitchC-ospf-1] area 0
[SwitchC-ospf-1-area-0.0.0.0] network 3.3.3.3 0.0.0.0
[SwitchC-ospf-1-area-0.0.0.0] network 9.1.1.0 0.0.0.255
[SwitchC-ospf-1-area-0.0.0.0] quit
[SwitchC-ospf-1] quit
[SwitchC] display bgp peer ipv4
BGP local router ID : 3.3.3.3
Local AS number : 65009
Total number of peers : 1 Peers in established state : 1
* - Dynamically created peer
Peer AS MsgRcvd MsgSent OutQ PrefRcv Up/Down State
2.2.2.2 65009 2 2 0 0 00:00:13 Established
The output shows that Switch C has established an IBGP peer relationship with Switch B.
3. Configure EBGP:
# Configure Switch A.
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