IOS Commands

[walu]

Hello,

i am searching for an particular ios command to set an serial interface to down if the router recognize that the line is flapping or that the line has errors (e.g crc).

Is there a tracking command for the line or something else ?

Thanks for all responses.

[dgahm]

It won't specifically recognize flapping, but if your encapsulation is PPP you could use link quality monitoring, where you set a percentage of successful traffic needed to keep the link up. http://www.faqs.org/rfcs/rfc1989.html

interface sX/X

ppp quality 99

This turns on periodic link quality report packets, and would bring the link down if less than 99% successful. It comes closer to evaluating how the link is doing with real data as opposed to small keepalive packets.

[Georg Pauwen]

Hello,

you also might want to have a look at IP Event Dampening:

IP Event Dampening

http://www.cisco.com/en/US/products/ps6350/products_configuration_guide_chapter09186a0080457c1d.html

Regards,

GP