Bgp Error Configuration Example; Bgp Peer Connection Establishment Error - Huawei Quidway S5600 Series Operation Manual

Operation Manual – Routing Protocol
Quidway S5600 Series Ethernet Switches-Release 1510
[SwitchC-route-policy] apply local-preference 200
[SwitchC-route-policy] quit
[SwitchC] route-policy localpref permit node 20
[SwitchC-route-policy] apply local-preference 100
[SwitchC-route-policy] quit
# Apply this routing policy to the inbound traffic flows coming from BGP neighbor
193.1.1.1 (SwitchA).
[SwitchC] bgp 200
[SwitchC-bgp] peer 193.1.1.1 route-policy localpref import
In this case, because the local preference value of the route 1.0.0.0 learnt by SwitchC is
200, which is greater than that of the route 1.0.0.0 learnt by SwitchB (SwitchB does not
configure the local preference attribute, the default value is 100), SwitchD still chooses
the route 1.0.0.0 coming from SwitchC first.

5.10 BGP Error Configuration Example

5.10.1 BGP Peer Connection Establishment Error

I. Symptom
When you use the display bgp peer command to display the BGP peer information,
the connection with the opposite peer cannot be established.
II. Analysis
Establishing BGP neighbor needs to use the 179 port to establish TCP session, and
correct exchange of Open message is required.
III. Troubleshooting
(1)
Use the display current-configuration command to check the AS number
configuration of the neighbor.
(2) Use the display bgp peer command to check the IP address of the neighbor.
(3) If a loopback interface is used, check whether the connect-interface command
is configured.
(4)
If the neighbor is not physically directed, check whether the peer ebgp-max-hop
command is configured.
(5)
Check whether there is an available route of the neighbor in the routing table.
(6) Use the ping -a ip-address command to check the TCP connection.
(7) Check whether you have disabled the ACL of TCP port 179.
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Chapter 5 BGP Configuration