3Com S7906E Configuration Manual page 821

Figure 1-22 Network diagram for BGP load balancing configuration (on switches)
Configuration procedure
1) Configure IP addresses for interfaces (omitted)
2) Configure BGP connections
On Switch A, establish eBGP connections with Switch B and Switch C respectively; configure BGP
to advertise network 8.1.1.0/24 to Switch B and Switch C, so that Switch B and Switch C can
access the internal network connected to Switch A.
On Switch B, establish an eBGP connection with Switch A and an iBGP connection with Switch C;
configure BGP to advertise network 9.1.1.0/24 to Switch A, so that Switch A can access the
intranet through Switch B; configure a static route to interface loopback 0 on Switch C (or use a
routing protocol like OSPF) to establish the iBGP connection.
On Switch C, establish an eBGP connection with Switch A and an iBGP connection with Switch B;
configure BGP to advertise network 9.1.1.0/24 to Switch A, so that Switch A can access the
intranet through Switch C; configure a static route to interface loopback 0 on Switch B (or use
another protocol like OSPF) to establish the iBGP connection.
# Configure Switch A.
<SwitchA> system-view
[SwitchA] bgp 65008
[SwitchA-bgp] router-id 1.1.1.1
[SwitchA-bgp] peer 3.1.1.1 as-number 65009
[SwitchA-bgp] peer 3.1.2.1 as-number 65009
[SwitchA-bgp] network 8.1.1.1 24
[SwitchA-bgp] quit
# Configure Switch B.
<SwitchB> system-view
[SwitchB] bgp 65009
[SwitchB-bgp] router-id 2.2.2.2
[SwitchB-bgp] peer 3.1.1.2 as-number 65008
[SwitchB-bgp] peer 3.3.3.3 as-number 65009
[SwitchB-bgp] peer 3.3.3.3 connect-interface loopback 0
[SwitchB-bgp] network 9.1.1.0 255.255.255.0
[SwitchB-bgp] quit
[SwitchB] ip route-static 3.3.3.3 32 9.1.1.2
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