09-10-2009 05:41 AM - edited 03-04-2019 06:00 AM
All,
Is it possible to create an applet that would monitor a remote ip address and then perform an action based on that reachability?
What I have is something like this:
RTRA->RTRB->RTRC->RTRD
I want to be able to monitor RTRC's reachability to RTRD, but I need to do it from RTRB. You can't see it above, but RTRA also connects to RTRD. If RTRB can't get to RTRD through RTRC, I want RTRB to apply a policy map in the direction of RTRA because traffic will get redirected. Is this possible to do, or is there a better way of doing that?
Thanks,
John
09-10-2009 06:30 AM
John-
I think it's possible, but it would be pretty complex. I would post over in Network Management. Joe Clarke over there knows EEM like no other. Good luck and post the script when you get it working.
09-10-2009 08:33 AM
"Is this possible to do, or is there a better way of doing that? "
I might be missing something here, but wouldn't a dynamic IGP deal with the situation you describe?
09-10-2009 08:41 AM
Well, yes and no. I'm using bgp between all of these sites, but the site between RTRA and RTRB is a 100mb connection that our SANS traffic goes over. If RTRA lost it's connection to RTRD (not shown, but exists in real world; it's a loop), then all branch traffic will get to RTRA via RTRC->RTRB->RTRA. When the link at either RTRA to RTRD or RTRC to RTRD goes down, I need to apply a policy map to RTRB to restrict traffic so the SANS doesn't take up all 100mb, which it takes up to 80-90mb now. So, the failover works good, but I'd like to apply the policy map automatically if the site went down at 2 in the morning.
Thanks,
John
09-10-2009 10:06 AM
From what you just described, perhaps QoS would be a better solution? It seems the real issue, in a failure situation, is SAN and other traffic sharing a link. For such, you could use QoS such that SAN has little, if almost any, adverse impact to the other traffic.
09-10-2009 12:13 PM
Joseph,
That's what I was planning on doing with the policy map. It looks like I may be able to monitor a remote router using snmp, but I'm still playing with that scenario.
Thanks,
John
09-10-2009 04:29 PM
What would you be unable to use the policy map all the time?
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