Apologies if this is not the right forum, I couldn't find one for hardware (if this is indeed a hardware fault...)
I have a number of 2811 and 3745 routers which I am trying to link back to back (at this stage) in my lab for staging, they will eventually be deployed and connected via E3 microwave links.
I am having a problem in that certain pars of the modules will work perfectly well together, but other pairs wont.
A brief overview of the topology:
2811 with 1 x E3 module [A] <--> 3745 with 2 x E3 modules [B, C] <--> 3745 with 2 x E3 module [D, E] <-> eventually another 2811 with 1 x E3 module [F]
E3 modules A and B will link fine, as will C and D, and also A and E. I have not yet gotten around to testing E and F yet...
But if I try to connect A and D, module A will have an OOF indicator which blinks on and off irregularly (and on the console I see the interface continuously going up/down), and D will have constant FERF and be down/down. Likewise if I link A and C.
If I link B and C, B will have constant OOF and C will have constant FERF.
Try any combination you like other than A-B and C-D and you get this type of behaviour.
The modules are second hand, and I could try to have them replaced, but is it possible that all 4 would be dodgy? And what in particular about A-B, C-D lets them work, but not other combinations?
My config is quite simple on each interface:
no ip address
no atm ilmi-keepalive
interface ATMX/0.1 point-to-point
ip address 192.168.0.x 255.255.255.252
Can anyone suggest any commands I can run, debugs I can turn on and the likes to try and work out whats going on? Are there any tricks to operating two of the same type of card in a 3745, like particular slots they should be installed in (one would hope not)?
I dont feel comfortable rolling these things out into the field, if we have issues and I cant guarantee that any combination of card will work its inevitably going to lead to frustration and more down time trying to shuffle things around to get it working again.