On Fri, Oct 03, 2008 at 06:46:17PM -0400, [EMAIL PROTECTED] wrote: > From: Robert Vassar <[EMAIL PROTECTED]> > Subject: [time-nuts] GPS, NTP, and Cisco routers... > > I've been fiddling around with an old Cisco router here at the house > to brush up. We have an IPv6 project going at work, and our WAN > provider provides no native transit, so I'm looking at doing some > tunneling. Anyhow... I discovered IOS 12.1 and above have native NTP > capability. I don't have the exhaustive IOS command reference, and I > suspect it's a limited NTP implementation. I'm wondering if it's > possible to tie a GPS unit to a router serial port and gain a stratum > 0 refclock. > > > Any Cisco guru's on the list? :-)
Cisco routers have a fairly basic NTP capability. No chance right now of using the serial port to speak to a GPS or synced clock on 90% of the gear. I can't say for certain on some of the really high-end stuff but I kinda doubt it. Its really only intended for redistribution, heck, you can even *set* what Stratum you claim to be ( by default I think Cisco uses 8 ). The only "extra" features they support is they will do ntp/multicast which is nice from a client config point of view for us at least. I'm using a pair of Endrun CDMA based ntp servers because they will work inside a colo without external antennas, they sync our Cisco cores which multicast out to the clients. We're within a few milliseconds which is close enough. For redistribution to customers we sync a bunch of unix ntp servers directly off the CDMA servers so our customers get Stratum 2. I hope to be adding a third Endrun box to the mix shortly where I can put up an external GPS antenna... -- -------------------------------------------------------------------- - Tom Arnold - "...is it a virus, a drug, or a religion?" - Sysabend Caretaker - Juanita Shrugs. "What's the difference?" ------------------------ -- Neal Stephenson, Snow Crash _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.