Connect two Cisco 2501's accross T1 with DSL access on one end 1

[LRS46]

I have been asked to help configure two Cisco 2501's to talk to each other across a T1 point-to-point, allowing the remote site to access the internet through a DSL connection at the main site. The 2501's are each connected to ADTRAN TSU ACE units. As for my background, I have been out of the industry for several years (trying the sales gig) and haven't had the opportunity to for hands on with Cisco gear for nearly four years.

First, the TSU shows everything is ok: no alarms and all lights green.

Second, the routers are old and one has IOS version 11.0 and the second one has version 12.0.

Third, the location is 200 miles from me and the travel is killing me so I am asking for help without direct access to the units for now.

Fourth, the DSL modem is Netopia from SBC and has the subnet of 192.168.1.0/24 and the default gateway is 192.168.1.254.

I have tried so many configurations that I can't list them all, but I cannot get the routers to talk to each other. SBC insists the t1 is fine and the ADTRAN seems to confirm this.

QUESTIONS: how would you configure the serial ports given that the IOS's are 11.0 and 12.0.? All the documentation I can find is rudimentary and focuses on 12.0.

- I used to remember that we bridged these devices years ago across T1's but I can't find the documentation on how to do that.

- On the IOS 11.0 version, I don't have a lot of the options that I have for 12.0 and really cannot recall how we might have configured these. However, the one thing I see differently and don't remember seeing before is that after the router name on the older router is "(boot)". Like this:
router2(boot)>
what does the (boot) refer to?

Thanks for your help.

Larry

 

[valarian]

Hi Larry...
several thoughts on your problem:
1) Your older router seems to have a problem with the IOS, it looks like it is booting from ROM. You should check wether the IOS in flash memory is intact and there is no command in the config that forces the router to boot from ROM.
2) In order to get you T1 between the Cisco routers up, try this configuration:
Router1(config)# interface serial0
Router1(config-if)#ip address <192.168.1.1> <255.255.255.252>
Router1(config-if)#no shutdown

Router2(config)# interface serial0
Router2(config-if)#ip address <192.168.1.2> <255.255.255.252>
Router2(config-if)#no shutdown

Encapsulation is default HDLC on Cisco's, so this should be running out-of-the-box. If it doesn't, try the command
"encapsulation hdlc"on both router's serial interfaces.

And a question, just to understand your setup completely:
Where is the DSL modem connected to? Or is it a DSL router? I'm not quite sure, what hardware you have there.

Mike

 

[LRS46]

Mike,

Thanks for the reply. It turns out that I had a configuration similar to yours that didn't seem to work. After futzing with it, it turns out that the ADTRAN unit was bad on Router 2.

Router 1 was connected to 24-port SMC switch and the DSL router was connected to the switch uplink. The boot ROM thing was weird, so I grabbed another 2501 and viola, it worked great.

Not having touched a 2500 in years, I was thinking that I must have lost my mind and was overlooking something. It was a frustrating thing but, nonetheless, it was an equipment issue and I was not totally wacked out. Coincidentally, I just came back from there a few hours ago.

Regards,

Larry

Larry S.