Their loopback interfaces are not reachable to each other, so directly connected interfaces are used for establishing BGP sessions. The eBGP peers, Switch A and Switch B (usually belonging to different carriers), are located in different ASs. The output information shows that Switch C has established an iBGP peer relationship with Switch B. Remote Address Remote-AS Local-AS State Admin Status HP Switch(bgp)# neighbor 2.2.2.2 connect-interface loopback 0 To prevent route flapping caused by port state changes, this example uses loopback interfaces to establish iBGP connections.īecause 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.Įnable OSPF in AS 65009 to ensure that Switch B can communicate with Switch C through loopback interfaces.
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