high latency for local interface

[Srinivas Geeta]

Dear Team,

I have configured BGP in Cisco 3845 router with "c3845-advipservicesk9-mz.124-3d.bin" IOS. I am getting avg 60 ms for my local interface, where as avg 29 ms for my BGP neighbor. when i trace my local interface, first it is going to my neighbor and coming back. Please guide me to resolve the issue.

Router#ping X.X.X.254 --- Local interface IP

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to X.X.X.254, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 56/60/68 ms

Router#ping X.X.X..253 ---- BGP neighbor

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to X.X.X..253, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 28/29/32 ms

Trace report: -

Router#traceroute X.X.X.254

Type escape sequence to abort.
Tracing the route to X.X.X.254

  1 X.X.X.253 36 msec 28 msec 28 msec
  2 X.X.X.254 60 msec 56 msec *

[anisaini]

If the interface is Serial interface , this is not an issue this is expected behavior.

The way the packets are processed on serial is if the packet destined for selfip it will be sent on to wire reach other side and come back, this behavior is different than Ethernet interface where switching happens locally