LOOPBack test procedure

[jmmartinez25]

Hi i need help on how i can test a loopback on my router and CSU/DSU. I can set the modem for loopback capability but how i can verify that if I ping my serial interface the packet will go forward through the modem looback set up.and goes back to the router serial interface.

[ankurbhasin]

Hi immartinez,

Once you give an internal loop from your modem towards your router you have to check your serial interface status and it should show you up and up and it should show you looped.

Then start pining your rouer serial interface and check for if any errors are incrementing or not.

This is the way you can perform loopback testing from your modem to you router.

HTH

Ankur

[jmmartinez25]

Hello ankur,

thank you very much do i have to ping the serial 0 on the cli of the router . also if i type show controllers s0 i should be getting the clock rate coming from the modem?

[desai.jaideep]

Hi,

Do the following to do it.

(1)On the modem,give the loopback(analog/remote)

(2)Change the encapulation on the serial interface to "hdlc".

(3)Give "shut" and "no shut" command on serial interface.

(4)ping the serial interface ip address.

(5)check for the continuity.

This is how you these for the loopback.Inform me if the problem is solved or not.

Regards,

Jaideep

[rupaheli]

Dear all,

Can any one know how to give hardwired loop. If I have router connected to the modem which can be 2wire or 4wire leased line. Now second end is at remote site where i cann't have access.

Now I want to check the loop in router , can i do this using modem and router which are my end only.

Thanks

Neeraj

[desai.jaideep]

Can u tell me the modem make?