WAN-One side traffic

[bapatsubodh]

Hi

We have a WAN link connected to Gigabit interface of the routers. I am able to see that the interface are up on both the routers and are clean.

I am also able to see one router in the CDP neighbor but I am not able to see otherwise.

( Router A can see Router B in the CDP neighbor  but Router B can not see Router A in the CDP neighbor )

I am not able to ping to each other.

This looks like a one way traffic problem from Service provider side to me. ( as CDP uses UDP )

Please share the experience.

Thanks in advance!

Subodh

[cadet alain]

Hi,

cdp is a L2 Cisco proprietary protocol and as such it doesn't use any L4 protocol.

both routers not pinging themselves is not necessarily a 1-way problem, is one of the routers owned by ISP?

Regards.

Alain.

[Majed Saeed]

hi sir ,,

you are saying ... ( Router A can see Router B in the CDP neighbor  but Router B can not see Router A in the CDP neighbor ) !!!!!

first ,,, kindly re-moved cpd configuration then type it again .... by using RouterB(config)#no cdp run .... then configure it

again ...

second ...please try to use ( debug cdp ip ) & ( debug cdp adjancy ) & ( debug cdp events ) command from router a ,,,, then do the same in router b . after that share the output and share them ...

Hope this helpful for you initilally ....

regards,

majed

[bapatsubodh]

Thanks for the reply. As expected it's SP problem.