I didn't see this question earlier...but I have a question concerning the connectivity between these two devices... What is the difference in having these boxes in a lab environment and in the field? (as far as clocking goes) If they're hooked up back to back, isn't that the same way you would have them in the field? What happens when you switch clocking to internal? What does this accomplish? Is this a cisco specific thing to configure atm through sonet as opposed to dark fiber? (or vice versa) I've never had to do anything like this with any vendor's gear. Just curious as to what is actually taking place here. -Patrick >>> "Tom Keough" 09/17/01 01:16PM >>> Hello Groupstudy! Thanks to those who spotted my clocking issue with connecting two ATM routers back to back in my lab. The command "atm clock INTERNAL" (caps supplied by Cisco IOS 12.x) instantly solved the problem of the bouncing interfaces ATM1/0!! You were my last resort to solve this problem and you came through like champs... Thanks and God Bless America, Tom -- Tom Keough, CCNP, MCSE CCIE Candidate [EMAIL PROTECTED] ""Daniel Cotts"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > You need to have clocking internal on one end and line (default) on the > other. > atm clock INTERNAL > I don't have Caslow handy so don't know if the above is included in the > config. > Here's a working config between two 7500s. They are running 11.3 > > First end: > interface ATM6/0 > description Location AnyCo_North. Always node 4. > no ip address > atm clock INTERNAL > ! > interface ATM6/0.1 multipoint > description pvc to Data Center via fiber > ip address xxx.yyy.7.250 255.255.255.252 secondary > ip address 10.18.35.4 255.255.255.0 > atm pvc 1 0 35 aal5snap > map-group TGN > appletalk cable-range 35-35 35.4 > appletalk zone ATM > map-list TGN > ip 10.18.35.1 atm-vc 1 broadcast > appletalk 35.1 atm-vc 1 broadcast > ip xxx.yyy.7.249 atm-vc 1 broadcast > > Other end: > interface ATM12/0 > description Location AnyCo. Always node 1. > no ip address > ! > interface ATM12/0.1 multipoint > description pvc to AnyCo_North > ip address xxx.yyy.7.249 255.255.255.252 secondary > ip address 10.18.35.1 255.255.255.0 > atm pvc 1 0 35 aal5snap > map-group TGE > appletalk cable-range 35-35 35.1 > appletalk zone ATM > > map-list TGE > ip 10.18.35.4 atm-vc 1 broadcast > appletalk 35.4 atm-vc 1 broadcast > ip xxx.yyy.7.250 atm-vc 1 broadcast > > > > -----Original Message----- > > From: Tom Keough [mailto:[EMAIL PROTECTED]] > > Sent: Saturday, September 15, 2001 2:06 PM > > To: [EMAIL PROTECTED] > > Subject: Problem connecting 2 routers w/ATM OC3 int back to back > > [7:20061] > > > > > > Hello groupstudy, > > The problem is that when I configure and no shut the > > interfaces they just > > bounce between up and down every few seconds. I can put up a "loopback > > diagnostic" and ping each interface ok. I have connected a > > 3640 and a 2600 > > each with an ATM OC3 card back to back. I suspect I have not > > installed the > > two multimode fiber cables properly. I have searched CCO but > > can't find > > instructions for cabling the back to back configuration. I am > > using Caslow's > > book for the ATM configuration. > > > > I just read in the ATM section of the All-In-One CCIE Lab > > Study Guide about > > using one fiber cable for the back to back config vs. two > > cables to a switch > > but which cable to which jack?? I won't have access to my lab > > again until > > Monday or I'd be cable swapping right now. > > > > If anyone has any info on this I would greatly appreciate hearing from > > you... > > TIA, > > Tom > > > > -- > > > > Tom Keough, CCNP MCSE > > CCIE Candidate > > [EMAIL PROTECTED] > > Report misconduct > > and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=20192&t=20192 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
