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Configuration procedure
1. Configure IP addresses for interfaces. (Details not shown.)
2. Configure EBGP connections:
# Configure Router A.
<RouterA> system-view
[RouterA] bgp 10
[RouterA-bgp] router-id 1.1.1.1
[RouterA-bgp] peer 200.1.2.2 as-number 20
[RouterA-bgp] address-family ipv4 unicast
[RouterA-bgp-ipv4] peer 200.1.2.2 enable
[RouterA-bgp-ipv4] network 9.1.1.0 255.255.255.0
[RouterA-bgp-ipv4] quit
[RouterA-bgp] quit
# Configure Router B.
<RouterB> system-view
[RouterB] bgp 20
[RouterB-bgp] router-id 2.2.2.2
[RouterB-bgp] peer 200.1.2.1 as-number 10
[RouterB-bgp] peer 200.1.3.2 as-number 30
[RouterB-bgp] address-family ipv4 unicast
[RouterB-bgp-ipv4] peer 200.1.2.1 enable
[RouterB-bgp-ipv4] peer 200.1.3.2 enable
[RouterB-bgp-ipv4] quit
[RouterB-bgp] quit
# Configure Router C.
<RouterC> system-view
[RouterC] bgp 30
[RouterC-bgp] router-id 3.3.3.3
[RouterC-bgp] peer 200.1.3.1 as-number 20
[RouterC-bgp] address-family ipv4 unicast
[RouterC-bgp-ipv4] peer 200.1.3.1 enable
[RouterC-bgp-ipv4] quit
[RouterC-bgp] quit
# Display the BGP route 9.1.1.0 on Router B.
[RouterB] display bgp routing-table ipv4 9.1.1.0
BGP local router ID: 2.2.2.2
Local AS number: 20
Paths: 1 available, 1 best
BGP routing table information of 9.1.1.0/24:
From : 200.1.2.1 (1.1.1.1)
Relay nexthop : 200.1.2.1
Original nexthop: 200.1.2.1
OutLabel : NULL
AS-path : 10
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