ISDN problem

[moses12315]

I configure two sites connected with bri isdn connection. The problem is that those routers do not exchange routes. The routing protocol is EIGRP.

Thanks

moses

[Danilo Dy]

Hi,

To be able to help you further, can you post both router config?

Also, thus the ISDN connection works? I mean have you tried initiating the connection manually?

ISDN BRI Troubleshooting Flowchart

http://www.cisco.com/warp/public/129/isdn_20602.html

Regards,

Dandy

[Goutam Sanyal]

hi,

For establishing the BRI ISDN connection you can check the following:

1.Proper configuration of your primary interface.

2.Proper configuration of your BRI (back-up) interface.

3.Proper configuration of Dialer interface.

4.Proper configuration of Authentication.

5.Proper configuration static route.

6.Proper configuration of interesting traffic with ACL.

7.Proper configuration of route summarization.

If the routers are not exchanging the routes, then please check no.7 option properly.

Thanks

Goutam

[moses12315]

The configuration of one router is:

interface BRI1/0

description DA to DEPLI

bandwidth 128

ip address 10.0.1.66 255.255.255.252

encapsulation ppp

dialer idle-timeout 2147483

dialer map ip 10.0.1.65 name rea (phone number)

dialer load-threshold 255 either

dialer-group 1

isdn switch-type basic-net3

no fair-queue

The second router is similar. The two routers are communicating between them.

The no auto-summary is used in all routers for EIGRP .

The dialers list permits protocol ip

No authentication is used.

The routers do not exchange route information .

Thanks

moses

[pciaccio]

Can you provide furthr information regarding the routing. Submit the ROUTER EIGRP statements. Possibly you have the Dialer Interface set for Passive on either end???

[Richard Burts]

Moses

I believe that I see the problem and it is in your dialer map:

dialer map ip 10.0.1.65 name rea (phone number)

I suggest that you add the keyword broadcast to the dialer map. Without the keyword broadcast the connection will send unicast traffic but not broadcast or multicast. If you add the keyword then the broadcast and multicast traffic will be sent. And of course EIGRP hello packets are multicast and therefore need the keyword broadcast in the dialer map.

HTH

Rick

[Goutam Sanyal]

Hi,

With the addition with Richard Burts, I'd like to put the command syntax:

"dialer map protocol next-hop-address [name hostname] broadcast"

for more details you can visit : http://cisco.com/en/US/docs/ios/12_1/dial/command/reference/drdrd.html#wp1018533

Also I'd like to suggest you to reduce the time-out time “dialer idle-timeout 2147483” You can put the idle-timeout 300 which is in sec to reduce the ISDN billing.

Also when you are using the ISDN BRI, I'd like to suggest you to change to “dialer load-thres 128 either” instance of “dialer load-threshold 255 either”. By doing that it will bring the next B-Channel. Where the users wll be able to access the required things smoothly.

Also as per my knowledge "bandwidth 128" not required.

Best of Luck

Please rate if it helps you.

Thanks

Goutam