[c-nsp] Monitoring failed state of DSL / Cable (Ethernet) interfaces

[Dan Martin]

You may try "rping" on the router to ping some router upstream of the
dsl modem.  When the poll fails, you take the message and use that to
admin down the Ethernet interface on the router, thus triggering some
switch over.

Once its switched over, you will need to bring the interface back up so
you can keep pinging so you will know when the dsl line comes back to
life.

The fact that I know nothing about perl makes saying the following easy,

"you can just write a perl script to . . ."

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Brian Feeny
Sent: Tuesday, March 01, 2005 1:10 PM
To: 'cisco-nsp'
Subject: [c-nsp] Monitoring failed state of DSL / Cable (Ethernet)
interfaces


I have a configuration where I am load balancing default routes over 2 
WAN interfaces.

One interface is a T1 and the other is an ethernet interface plugged 
into a DSL / Cable bridge.

My concern is that if the connectivity goes down on the Cable / DSL 
then the interface
may stay up, since the ethernet connection may still look good.

I think some of you are using SAA stuff to deal with his, does anyone 
have any links on this?

Basically I just want to check the next hop and if its down, then pull 
the route.

Brian

---------------------------------------------
Brian Feeny, CCIE #8036, CISSP
Network Engineer
ShreveNet Inc.

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