RE: L3 keepalives without routing protocol?

[Ryan Moffett]

Well, BGP can be used as a measurement of L3 connectivity.   I have seen BGP used on several occasions to bring up ISDN dial backup in the event that a Frame-Relay interface went into an Up/Down status and thus would not trigger the backup interface to be used.   When the BGP neighbor session on the preferred path (local-preference) failed, the lower preference kicked in.   The only other possibility that I haven't tried might be to use NTP....I don't know if you can get a trap if an NTP client fails to sync with the master.....   -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Andy Harding Sent: Thursday, June 08, 2000 6:47 PM To: [EMAIL PROTECTED] Subject: L3 keepalives without routing protocol? Hi all,   strange problem for y'all...   I have a problem whereby a down circuit does not necessarily "down" an interface (via ATM switch - am using OAM but not foolproof).  Is there some way that I can enable a L3 keepalive without running a global IGP (bear in mind that this is between my core routers and several thousand 25XX/26XX clients, and I don't want to give them a routing table, just a default route).   We run a NOCOL-type daemon that alerts me if a machine has been unpingable for >15 minutes, but am looking for a sure-fire way to have a core router send the NMS a trap when a circuit becomes unreachable at L3.   any help much appreciated as always   Andy