Cisco Support Community
Community Member

Permanent loopback troubleshooting capability?

Hi all,

Just wondering if it's possible to enable a permanent loopback capability on my T1 controller/serial interface - without affecting regular traffic.

I've got 1841 routers with VWIC2-1MFT-T1/E1 cards, simply running PPP with an IP address on the serial.

Thanks in advance,


Community Member

Re: Permanent loopback troubleshooting capability?

no it can not be it posssible to explain the requirement in more detail?

Community Member

Re: Permanent loopback troubleshooting capability?

Requirement: The T1 circuit is not ours, therefore we must contact our partners in this project to inform them of any failures (we do the monitoring, PING of serial interface), at which point people at their end begin troubleshooting. For this, they often ask us to enable a loopback at our end in order to help them identify where the problem with the circuit may exist. Unfortunately, this happens often (flaky circuit) and it would be nice if we didn't need to jump through any hoops to accomodate them in the troubleshooting... hence, having a loopback respond at all times sure would make life easy.

A friend mentioned that I could use the "PPP loopback ignore" command (on the controller I believe), which would allow loopback requests to be responded to by the router... yet, I have no idea if this would affect regular traffic when enabled...

Thoughts on this anyone??

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