3Com Switch 8800 Configuration Guide Chapter 21 BGP Configuration21-30Using the display bgp routing-table command, you can view BGP routing table onSwitch B. Note: Switch B has known the existence of network 1.0.0.0.Using the display bgp routing-table command ,you can view the BGP routing table onSwitch D. Note: Switch D also knows the existence of network 1.0.0.0.21.4.3 Configuring BGP RoutingI. Network requirementsThis example illustrates how the administrators manage the routing via BGP attributes.All switches are configured with BGP, and IGP in AS 200 utilizes OSPF. Switch A is inAS 100, and Switch B, Switch C and Switch D are in AS 200.Switch A, Switch B, andSwitch C operate EBGP. Switch B, Switch C and Switch D operate IBGP.II. Network diagramVLAN 4194.1.1.2/24VLAN 2192.1.1.1/24VLAN 3193.1.1.1/24 VLAN 3193.1.1.2/24VLAN 5195.1.1.2/24VLAN 2192.1.1.2/242.2.2.24.4.4.43.3.3.31.1.1.1AS100AS200VLAN 4194.1.1.1/24VLAN 5195.1.1.1/24IBGPIBGPEBGPEBGPTo network1.0.0.0To network2.0.0.0To network4.0.0.0To network3.0.0.0Switch ASwitch BSwitch CSwitch DFigure 21-4 Networking diagram for BGP routing configurationIII. Configuration procedure1) Configure Switch A:[Switch A] interface Vlan-interface 2[Switch A-Vlan-interface2] ip address 192.1.1.1 255.255.255.0[Switch A] interface Vlan-interface 3[Switch A-Vlan-interface3] ip address 193.1.1.1 255.255.255.0Enable BGP[Switch A] bgp 100Specify the network that BGP sends to[Switch A-bgp] network 1.0.0.0Configure the peers[Switch A-bgp] group ex192 external[Switch A-bgp] peer 192.1.1.2 group ex192 as-number 200
