From: Carlos G Mendioroz (tron@huapi.ba.ar)
Date: Thu Feb 24 2005 - 21:30:23 GMT-3
One of my favourite tricks is using loopbacks and backup combos.
A backup basically forces a related interface down (standby) as long as
a reference interface is up. If you chain two standby ifs, using a
loopback in the midle, you might get what you are looking for.
i.e.:
int s 0/0
backup int lo 0
int lo 0
backup int f 0/0
s0/0 up ==> lo 0 down(stdby) ==> f0/0 up
s0/0 down ==> lo 0 up ==> f0/0 down(stdby)
I've just tried this and it does not work, but a small (and uglier)
variant does the job (as long as you don't have a default route on the
router).
You can have a tunnel interface state follow the availability of a
route. (tunnel destination routable means tunnel is up)
If you put an address in the above loopback and a tunnel interface with
destination in the same subnet, then the tunnel interface will follow
the state of the loopback, and if you then put the backup in the tunnel
interface, it works...
rodneyt@bigpond.net.au wrote:
> HI There,
>
> I have a requirement at work......
>
> Is it possible to detect a failure on one physical interface (say a serial) and force another physical interface down (say an ethernet) at the same time?
>
> It can be done with a TCL script on the router but if the router reloads the process has to be manually restarted?
>
> Thanks
>
> Rodney
>
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-- Carlos G Mendioroz <tron@huapi.ba.ar> LW7 EQI Argentina
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