It looks like the feature set varies significantly with the router model, and by IOS feature set. The router I have here is an eBay special, an old 2514. It's probably 10 years old, though I think Cisco continued to make them until about 2003. It's only configured with 8mb flash, so it can only run the stripped down IP subset. (which lacks the IPv6 stuff I need too...) Every few years I dabble with ploughing thru the CC** tests, but I'm a QA engineer, so it never becomes a priority.
It's running c2500-i-l.121-27b.bin, and my ntp menu looks quite different: Router2#config t Enter configuration commands, one per line. End with CNTL/Z. Router2(config)#ntp ? access-group Control NTP access authenticate Authenticate time sources authentication-key Authentication key for trusted time sources broadcastdelay Estimated round-trip delay clock-period Length of hardware clock tick master Act as NTP master clock max-associations Set maximum number of associations peer Configure NTP peer server Configure NTP server source Configure interface for source address trusted-key Key numbers for trusted time sources Router2(config)#^Z No "refclock" option. If I had a 16mb flash card, I could run the "Enterprise" image, which might have different features. But a 16mb flash card and FPM SIMM cost more than this router is worth. It appears to be NTP v3 as well, though all my Solaris boxes run v3 due to some issues with NTP 4.x and the kernel clock code. (It's being fixed...) I'll have to look at one of the newer models I have in the lab at work. I've also been thinking of buying an 851w for my DSL line here at the house. I've outgrown my WRT54G, even running Tomato, perhaps I'll be pleasantly surprised. I hadn't even looked at Cisco stuff since 2002 or so, certainly pre-12.1 anyway. I was just kind of surprised to come across an NTP server at all, and I was curious what its "Time-Nuts hackability" rating was. :-) Thanks and 73, Rob KC6OOM/5 On Oct 5, 2008, at 12:00 AM, Dave hartzell wrote: > Looks like Trimble and Cisco got together on a PPS implementation for > the 7200, starting with 12.0T trainwreck: > > http://www.cisco.com/en/US/docs/ios/12_1t/12_1t1/feature/guide/ > dtrimble.html > > Since I don't have any 7200s any longer (thank goodness), I checked > and it seems that the 6500s support this as well on the console serial > port: > > 6509-rtr(config-line)#ntp ? > pps-discipline Use PPS pulse to discipline system clock > refclock NTP Reference Clock > > and > > 6509-rtr(config-line)#ntp refclock ? > telecom-solutions Telecom Solutions GPS > trimble Trimble Navigation TSIP Protocol > > It looks interesting, and if the code is just looking for a PPS > transition on the CTS or RI, you might be in luck with any external > PPS... > > BUT be forewarned, IOS is a cooperative multitasking operating system > (at least prior to the new "modular" stuff), so your accuracy is going > to vary depending on loads, processes, etc. I wouldn't count on this > being to spectacular... probably no better than an external NTP > source. > > And of course, you can always call the TAC for more assistance! ;-) > > 73, > Dave > AF6KD > > > On Fri, Oct 3, 2008 at 2:39 PM, Robert Vassar <[EMAIL PROTECTED] > vassar.com> wrote: >> >> >> >> 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? :-) >> >> >> >> Cheers, >> >> Rob >> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/ >> listinfo/time-nuts >> and follow the instructions there. >> > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/ > time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
