H3C S7500 Series Ethernet Switches Operation Manual
Operation Manual – Routing Protocol
H3C S7500 Series Ethernet Switches Chapter 6 BGP Configuration
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[SwitchC] ospf
[SwitchC-ospf-1] area 0
[SwitchC-ospf-1-area-0.0.0.0] network 193.1.1.0 0.0.0.255
[SwitchC-ospf-1-area-0.0.0.0] network 195.1.1.0 0.0.0.255
[SwitchC] bgp 200
[SwitchC-bgp] undo synchronization
[SwitchC-bgp] group ex external
[SwitchC-bgp] peer 193.1.1.1 group ex as-number 100
[SwitchC-bgp] group in internal
[SwitchC-bgp] peer 195.1.1.1 group in
[SwitchC-bgp] peer 194.1.1.2 group in
4) Configure Switch D.
[SwitchD] interface vlan-interface 4
[SwitchD-Vlan-interface4] ip address 194.1.1.1 255.255.255.0
[SwitchD] interface vlan-interface 5
[SwitchD-Vlan-interface5] ip address 195.1.1.1 255.255.255.0
[SwitchD] ospf
[SwitchD-ospf-1] area 0
[SwitchD-ospf-1-area-0.0.0.0] network 194.1.1.0 0.0.0.255
[SwitchD-ospf-1-area-0.0.0.0] network 195.1.1.0 0.0.0.255
[SwitchD-ospf-1-area-0.0.0.0] network 4.0.0.0 0.255.255.255
[SwitchD] bgp 200
[SwitchD-bgp] undo synchronization
[SwitchD-bgp] group in internal
[SwitchD-bgp] peer 195.1.1.2 group in
[SwitchD-bgp] peer 194.1.1.2 group in
z For the configuration to take effect, the reset bgp all command needs to be
executed on all the BGP neighbors.
z After the above configuration, because the MED attribute value of the route
1.0.0.0 learned by Switch C is smaller than that of the route 1.0.0.0 learned by
Switch B, Switch D will choose the route 1.0.0.0 coming from Switch C.
z If you do not configure MED attribute of Switch A when you configure Switch A
but configure the local preference on Switch C as following:
# Configure the local preference of Switch C
z Create ACL 2000 to permit routing information sourced from network 1.0.0.0.
[SwitchC] acl number 2000
[SwitchC-acl-basic-2000] rule permit source 1.0.0.0 0.255.255.255
[SwitchC-acl-basic-2000] rule deny source any
z Define a routing policy named localpref, and set the local preference of the
routes matching with ACL 2000 to 200, and that of those unmatched routes to
100.
[SwitchC] route-policy localpref permit node 10