User's Manual

40-29
40.4 BGP Troubleshooting
In the process of configuring and implementing BGP protocol, physical connection, configuration false
probably leads to BGP protocol doesn’t work. Therefore, the customers should give their attention to points as
follow:
 First of all, to ensure correct physical connection;
 Secondly, to ensure interface and link protocol are UP (execute show interface instruction);
 And startup BGP protocol (use router bgp command), configure affiliated IBGP and EBGP neighbors
(use neighbor remote-as command).
 Notice BGP protocol itself can’t detect route, needs to import other routes to create BGP route. Only it
enables these routes to announce IBGP and EBGP neighbors by importing routes. Direct-link routes,
static route, and IGP route (RIP and OSPF) are included in these imported routes. network and
redistribute (BGP) command are the ways of imported routes.
 For BGP, pay attention to the difference between the behaviors of IBGP and EBGP.
 After configuration finishes, the command of show ip bgp summary can be used to observe
neighbor’s connections, so that all of the neighbors keep BGP connection situation. And use show ip
bgp command to observe BGP routing table.
 If BGP routing problem still can’t be solved by debugging, please use debug instructions like debug
ip bgp packet/events etc, and copy DEBUG information in 3 minutes, then send them to our
Technology Service Center.