H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – IPv4 Routing
H3C S7500E Series Ethernet Switches Chapter 5 BGP Configuration
5-61
[SwitchC] bgp 200
[SwitchC-bgp] peer 193.1.1.1 route-policy localpref import
[SwitchC-bgp] quit
# Display the routing table on Switch D.
[SwitchD] display bgp routing-table
Total Number of Routes: 2
BGP Local router ID is 194.1.1.1
Status codes: * - valid, > - best, d - damped,
h - history, i - internal, s - suppressed, S - Stale
Origin : i - IGP, e - EGP, ? - incomplete
Network NextHop MED LocPrf PrefVal Path/Ogn
*>i 1.0.0.0 193.1.1.1 0 200 0 100i
* i 192.1.1.1 0 100 0 100i
You can find route 1.0.0.0/8 from Switch D to Switch C is the optimal.
5.10 Troubleshooting BGP
5.10.1 No BGP Peer Relationship Established
I. Symptom
Display BGP peer information using the display bgp peer command. The state of the
connection to a peer cannot become established.
II. Analysis
To become BGP peers, any two routers need to establish a TCP session using port 179
and exchange open messages successfully.
III. Solution
1) Use the display current-configuration command to verify the peer’s AS number.
2) Use the display bgp peer command to verify the peer’s IP address.
3) If the loopback interface is used, check whether the peer connect-interface
command is configured.
4) If the peer is a non-direct EBGP peer, check whether the peer ebgp-max-hop
command is configured.
5) Check whether a route to the peer is available in the routing table.
6) Use the ping command to check connectivity.
7) Use the display tcp status command to check the TCP connection.
8) Check whether an ACL disabling TCP port 179 is configured.