H3C Technologies H3C SR8800 - Manual (Page 256)

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[RouterB-bgp] router-id 2.2.2.2
[RouterB-bgp] peer 3.3.3.3 as-number 65009
[RouterB-bgp] peer 3.3.3.3 connect-interface loopback 0
[RouterB-bgp] quit
[RouterB] ospf 1
[RouterB-ospf-1] area 0
[RouterB-ospf-1-area-0.0.0.0] network 2.2.2.2 0.0.0.0
[RouterB-ospf-1-area-0.0.0.0] network 9.1.1.1 0.0.0.255
[RouterB-ospf-1-area-0.0.0.0] quit
[RouterB-ospf-1] quit
# Configure Router C.
system-view
[RouterC] bgp 65009
[RouterC-bgp] router-id 3.3.3.3
[RouterC-bgp] peer 2.2.2.2 as-number 65009
[RouterC-bgp] peer 2.2.2.2 connect-interface loopback 0
[RouterC-bgp] quit
[RouterC] ospf 1
[RouterC-ospf-1] area 0
[RouterC-ospf-1-area-0.0.0.0] network 3.3.3.3 0.0.0.0
[RouterC-ospf-1-area-0.0.0.0] network 9.1.1.0 0.0.0.255
[RouterC-ospf-1-area-0.0.0.0] quit
[RouterC-ospf-1] quit
[RouterC] display bgp peer
BGP local router ID : 3.3.3.3
Local AS number : 65009
Total number of peers : 1 Peers in established state : 1
Peer AS MsgRcvd MsgSent OutQ PrefRcv Up/Down State
2.2.2.2 65009 7 10 0 0 00:06:09 Established
The output information shows that Router C has established an IBGP peer relationship with Router
B.
3. Configure EBGP:
{
The EBGP peers, Router A and Router B (usually belong to different ISPs), are located in
different ASs. Typically, their loopback interfaces are not reachable to each other, so directly
connected interfaces are used for establishing BGP sessions.
{
To enable Router C to access the network 8.1.1.0/24 connected directly to Router A, inject
network 8.1.1.0/24 to the BGP routing table of Router A.
# Configure Router A.
system-view
[RouterA] bgp 65008
[RouterA-bgp] router-id 1.1.1.1
[RouterA-bgp] peer 3.1.1.1 as-number 65009
[RouterA-bgp] network 8.1.1.1 24
[RouterA-bgp] quit
# Configure Router B.
[RouterB] bgp 65009
[RouterB-bgp] peer 3.1.1.2 as-number 65008