Mariusz Trojanowski wrote: > > Cable Guy wrote: > > > > When you put a hardware loopback plug on a serial to test it, > > why does the > > router see it as a loopback? With the show int serial command, > > you will see > > -----serial up, line protocol up (loopback mode)----- > It's magic - seriously. > http://www.cisco.com/warp/public/471/debug_ppp_negotiation.html > says: > > MagicNumber:
That's for PPP. What about when he's not using PPP? Priscilla > Magic Number support is available on all serial interfaces. > When using PPP, PPP always attempts to negotiate for Magic > Numbers, which are used to detect looped-back networks. A > random string is sent across the link and if the same value is > returned, then the router determines that the link is looped > back. > > The link might or might not be taken down upon looped-back > detection, > depending on the use of the down-when-looped command. > > Mariusz > > BTW - does anyone know, how to post to this group via News? I > tried twice, with no result. Do I have to give my correct > e-mail in From: post headers, or is it enough if Reply-to: > field is set correctly? Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=57064&t=56883 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
