ISDN Router Configuration

rcordeiro · ‎06-03-2008

Good evening to you all

I need your help

Ok, so this is the situation: I have 2 separate offices which need to communicate with each other. For that purpose we have 2 basic ISDN accesses on the offices. And now we have to configure 2 Cisco Series 870 so that one of the offices can access a printer on the other office.

Here are the Ip's in question:

Local Network on Office A: 10.112.148.0 - 255.255.255.0

WAN IP of Office A Router:10.112.150.5 - 255.255.255.252

Office B Printer: 10.112.149.6 - 255.255.255.252

WAN IP of Office B Router:10.112.150.6 - 255.255.255.252

Office B IDSN Dial Up Number: 222222222

Ok...so the purpose is, when someone in office A needs to print something on office B, the office A router dials up to the office B router which accepts it's calls.

I've configured the routers, and I wanted to know if they are correctly configured. Please check it out, and if you see anything wrong please tell me.

The configurations are attached.

Any help is apreciated

Thkx

smahbub · ‎06-09-2008

Refer to the "Cisco 800 Series Routers configuration guides" present in the following url for all your configuration needs:

http://www.cisco.com/en/US/products/hw/routers/ps380/prod_configuration_examples_list.html

rkendrick_2 · ‎06-09-2008

Boooooo!

He needs some help with his ATTACHED configs, not a link to a hard-to-decipher/non-working Cisco page.

Okay RCordeiro, here's what I see:

Under BRI0 (officA-1) you may need to specify your local ISDN spid numbers like this:

!

interface BRI0

ip address 10.112.150.5 255.255.255.252

encapsulation ppp

dialer idle-timeout 30

dialer map ip 10.112.150.6 name remoteOfficeB_876 "broadcast" 222222222 (the broadcast command may be optional)

dialer-group 1

isdn switch-type basic-net3

isdn spid1 55522244440101 (your officeA1's local 1st ISDN bri spid number)

isdn spid2 55522244450101 (your officeA1's local 2nd ISDN bri spid number)

arp arpa

arp timeout 0

ppp authentication chap callin

ppp multilink (this is so both BRIs will bond)

no shut

!

Under officeB you need:

To almost mimic what you have in officA1 under BRI0. I don't believe your Dialer1 setup is needed unless you were backup up a frame or serial connection.

Just remember to have the office B1's local spids 1&2 specified under BRI0 and to point back to the remote officeA1 in the dialer map command.

It'll probably look like this:

!

interface BRI0

ip address 10.112.150.6 255.255.255.252

encapsulation ppp

dialer idle-timeout 30

dialer map ip 10.112.150.5 name remoteOfficeA_876 5552224444

dialer-group 1

isdn switch-type basic-net3

isdn spid1 22222222220101 (office B's local spid1)

isdn spid2 22222222230101 (office B's local spid2)

arp arpa

arp timeout 0

ppp authentication chap callin

ppp multilink

no shut

!

Use and 'isdn call' command if you're having trouble initiating the call (look up for further details). There are some debug like 'debug ppp negotiation' or 'debug ppp authentication' that help if you are having trouble.

I hope this helps...

paolo bevilacqua · ‎06-09-2008

rkendrick, do not bother, for some reason the other poster like to do this kind of "contributions" quite often. He is then rated consequently.

Note: no need to worry about SPIDs outside N.A.

From the "basic-net3" switch-type it can be inferred that this is the case.

Giuseppe Larosa · ‎06-09-2008

Hello,

the ISDN configuration looks like correct and you don't need SPIDs.

However, if you want to use the printer from PCs using Windows networking you may need some ip helper address x.x.x.x command inside the vlan 1 in office A in order to be able to propagate the search for printer.

To test that the ISDN configuration is working you can ping the ip address of the printer from the office-A router using a source of vlan1's ip address.

USeful commands are debug ppp negotiation, debug isdn q921, debug isdn q931, debug dialer events.

In a real world scenario you should define in a more precise way the interesting traffic to avoid to use the isdn link too much. Unless you are in Germany where you pay a flat rate for isdn you need to limit the circuit usage.

hope to help

Giuseppe