R3303-HP HSR6800 Routers Layer 3 - IP Routing Configuration Guide

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BGP configuration examples
BGP basic configuration
Network requirements
In Figure 73, run EBGP between Router A and Router B, and run IBGP between Router B and Router C so
that Router C can access the network 8.1.1.0/24 connected to Router A.
Figure 73 Network diagram
Configuration procedure
1. Configure IP addresses for interfaces. (Details not shown.)
2. Configure IBGP:
{ To prevent route flapping caused by port state changes, this example uses loopback interfaces
to establish IBGP connections.
{ Because loopback interfaces are virtual interfaces, you need to use the peer connect-interface
command to specify the loopback interface as the source interface for establishing BGP
connections.
{ Enable OSPF in AS 65009 to make sure that Router B can communicate with Router C through
loopback interfaces.
# Configure Router B.
<RouterB> system-view
[RouterB] bgp 65009
[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.
<RouterC> system-view
[RouterC] bgp 65009
[RouterC-bgp] router-id 3.3.3.3
[RouterC-bgp] peer 2.2.2.2 as-number 65009