KB.15.15

HP Switch(config)# router bgp 200

HP Switch(bgp)# neighbor 193.1.1.1 route-map localpref in

HP Switch(bgp)# exit

# Display the routing table on Switch D.

HP Switch(config)# show ip bgp

Local AS : 100

Local Router-id : 194.1.1.1

BGP Table Version : 1

Status codes: * - valid, > - best, i - internal, e - external, s - stale

Origin codes: i - IGP, e - EGP, ? - incomplete

Network Nexthop Metric LocalPref Weight AsPath

-------------------------------------------------------

*>e 1.0.0.0/24 200.1.3.1 200 0 100i

* i 1.0.0.0/24 100 0 100i

You can see that route 1.0.0.0/8 from Switch D to Switch C is the optimal route.

BGP GR configuration

Network requirements

In the following figure, all switches are BGP switches. There is a eBGP connection between Switch

A and Switch B. Switch B and Switch C are connected over an iBGP connection. Enable GR for

BGP so that the communication between Switch A and Switch C is not affected when an active/

standby main board switchover occurs on Switch B.

Figure 65 Network diagram for BGP GR configuration

328 Border Gateway Protocol (BGP)