I have 2 * 2620's and I am trying to connect them via their serial wics to run ospf. I have set them up in a lab and I am trying to connect over a constantly up isdn connection. This is done using 2 * adtran terminal adapters and the 'dialer in-band' command. The adtrans are happily talking to each other but I cant get the ciscos to see each other (either via ping,cdp, or ospf). I am using unnumbered serial ports.
The script I am using is basic and taken off the cisco website, and works when I replace the 2620's with 3640's.
Can anyone think of any reason why the 2620's will not talk? I have only 1 wic in each 2620 and nothing else,
please find attached a copy of config I used, identical for both except for ip's obviously:
ip address 188.8.131.52 255.0.0.0
ip address 184.108.40.206 255.0.0.0
ip unnumbered fastethernet0/0
router ospf 1
network 220.127.116.11 0.255.255.255 area 0
That is basically the script for both. The wics all show up when I look in 'sh int ser 0/0'. When I issue the 'no shut' command the adtrans come immediately up and stay up but I cant see across the link. I am using ios 12.2
We are using v35 and one of the ta's is configured to dial the other on dtr with a stored number. We need the dial in-band command for this to happen. The line protocol between the ta's is 64k clear channel. The clocking is being given by the ta's at 64000. Both ta's are set the same except one dials and one receives.
When we look at ser0/0 both admin and line protocol are up, on both routers.
The conf does work with 3640's, we were wondering whether there is someting different/new about the 2620's. Maybe a missed conf line or something similar? We are sure that the script is proven and working but just not on 2620's for some reason.
Maybe this is caused while you do not have your ethernet interface up. With unnumbered interfaces there is a requirement for the interface that you use the ip from must be active. This is one of the reasons that a loopback interface is the best choice as source for ip unnumbered.
The interfaces are active (apologies if my script did not reflect this), and I have tried using both the loopback and the ethernet addresses as the unnnumbered reference point. I can ping both. The script is very basic and taken from cisco themselves as a simple ospf network. Any more ideas?
Without the config on the remorte side it is difficult to judge, but I think your problem is that you are using ip unnumbered, on each side, this is causing the bri interfaces to be on separate subnets ,hence ping or OSPF would not be possible. You should however see eachother in CDP , is cdp enabled ?
Also on the Adtran TA's I beleive the reason they come up immediately is because there is a setting to dial when DTR is raised , it is under the config menu DTR options , the setting is something like ignore DTR .
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