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New Member

ISDN IP Routing - Help !!!

I have three sites; Sites A, B & C. Sites B and C both have the a Cisco 1720 with a BRI port (one 128K ISDN link attached) will respectively dial to Site A which has a 2620 router with two BRI ports as required.

Site A:

Loopback0 - 10.10.68.1

E0/0 - 10.10.69.1

Bri0/0 - no ip address

Bri0/1 - no ip address

L1--> RouterA(config)#username RouterB password 0 ciscoisdn

L2--> RouterA(config)#username RouterC password 0 ciscoisdn

L3--> RouterA(config)#int bri0/0

L4--> RouterA(config-if)#dialer pool-member 1

L5--> RouterA(config-if)#int dialer1

L6--> RouterA(config-if)#dialer pool 1

L7--> RouterA(config)#int bri0/1

L8--> RouterA(config-if)#dialer pool-member 2

L9--> RouterA(config-if)#int dialer2

L10--> RouterA(config-if)#dialer pool 2

.

.

.

L11--> RouterA(config)#ip route 10.10.18.1 255.255.255.255 dialer1

L12--> RouterA(config)#ip route 10.10.23.1 255.255.255.255 dialer2

Q1. Are L1 & L2 necessary for RouterB and RouterC to dial in (Using PPP authentication) ?

Q2. Are L11 & L12 routing correctly ?

Site B:

Loopback0 - 10.10.18.1

E0/0 - 10.10.19.1

Bri0/0 - no ip address

L1--> RouterB(config)#username RouterA password 0 ciscoisdn

L2--> RouterB(config)#int bri0/0

L3--> RouterB(config-if)#dialer pool-member 1

L4--> RouterB(config-if)#int dialer1

L5--> RouterB(config-if)#dialer pool 1

.

.

.

L6--> RouterB(config)#ip route 10.10.68.1 255.255.255.255 dialer1

Q1. Is L6 routing correctly ?

Site C:

Loopback0 - 10.10.23.1

E0/0 - 10.10.24.1

Bri0/0 - no ip address

L1--> RouterB(config)#username RouterA password 0 ciscoisdn

L2--> RouterC(config)#int bri0/0

L3--> RouterC(config-if)#dialer pool-member 1

L4--> RouterC(config-if)#int dialer1

L5--> RouterC(config-if)#dialer pool 1

.

.

.

L6--> RouterC(config)#ip route 10.10.68.1 255.255.255.255 dialer1

Q1.Is L6 routing correctly ?

Please help out.

10 REPLIES

Re: ISDN IP Routing - Help !!!

I assume, your bri interfaces, are using ip unnumbered command, utilising the ip address of the loopback interface on the BRI interface.

On all routers, there should be a default route, pointing to the BRI interface or the dialer interface.

For example on Site C

ip route 0.0.0.0 0.0.0.0 dialer 1

ip route 10.10.68.1 255.255.255.255 dialer 1

This should help!

Bronze

Re: ISDN IP Routing - Help !!!

First of all, you likely don't need to use Dialer Profiles at the remotes; it's more complex than is necessary. So a remote config like this would be fine:

username RouterA password 0 ciscoisdn

!

int Loopback0

ip address 10.10.23.1 255.255.255.0

!

int Bri0/0

ip unn loop 0

encap ppp

dialer map ip 10.10.68.1 name RouterA 1234

dialer-group 1

ppp multlink

ppp authen chap callin

dialer load threshold X

!

dialer-list 1 .........

!

ip route 0.0.0.0 0.0.0.0 bri 0/0 10.10.68.1

As for RouterA, same thing; you don't need Dialer Profiles really. You could have a config like this:

username RouterB password 0 ciscoisdn

username RouterC password 0 ciscoisdn

!

int Loopback0

ip addr 10.10.68.1 255.255.255.0

!

int Bri0/0

no ip address

dialer rotary 1

!

int Bri0/1

no ip address

dialer rotary 1

!

int dialer1

ip unn loop 0

encap ppp

ppp authen chap callin

ppp multilink

dialer-group 1

!

dialer-list 1 .....

!

ip route 10.10.24.0 255.255.255.0 10.10.23.1

ip route 10.10.19.0 255.255.255.0 10.10.18.1

See if that helps simplify things.

New Member

Re: ISDN IP Routing - Help !!!

Hi, for your "dialer rotary 1" in the RouterA config, what does it mean ?

Under what circumstances that I need to have "dialer profile" and what circumstances I don't need it ?

Please help out.

Thank out.

Cisco Employee

Re: ISDN IP Routing - Help !!!

Dialer profile is user specific..means every user have a specific dialer interface where you can use the different settings like, pap/chap, idle-timeout, authentication methods etc..

While Rotary-groups are more lagacy DDR..where all the users share the same config under one interface..

Pl. visit following urls for more

http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/dialts_c/dtsprt5/dcdhwddr.htm#xtocid294654

http://www.cisco.com/univercd/cc/td/doc/product/software/ios113ed/113ed_cr/dial_c/dcprt4/dcdiprof.htm

New Member

Re: ISDN IP Routing - Help !!!

Thank you very much on your guide.

Thank you.

Bronze

Re: ISDN IP Routing - Help !!!

When you have multiple interfaces that will be receiving or placing the same calls, then it's easiest (from the configuration perspective) to configure a rotary group, and assign each of the physical interfaces to the rotary-group - thus they will inherit the config of the rotary-group interface. This is what "dialer rotary 1" does, it associates the physical interface with "Dialer 1".

Dialer Profiles are really only needed when you have per-user requirements; ie, the users which are dialing in or to which you are dialing out to have unique interface configuration parameters. That does not look to be the case for you.

New Member

Re: ISDN IP Routing - Help !!!

Hi Sir, I had tried on the config you suggested above with "ISDN switch-type basic-net3", but from my RouterB and RouterC, when I ping to RouterA loopback address, they called to RouterA but failed.

Over RouterB and RouterC, I used commands;

sh isdn act - show nothing

sh isdn status - Layer 2 - Active

sh isdn his - out 7188223 Failed

.

.

.

Please help out.

Cisco Employee

Re: ISDN IP Routing - Help !!!

we need to see the following debug for a callout

debug isdn q931

debug ppp negotiation

debug ppp authentication

Bronze

Re: ISDN IP Routing - Help !!!

You need to have a look at the following to figure out what is wrong:

debug isdn q931

debug dialer

debug ppp neg

Cisco Employee

Re: ISDN IP Routing - Help !!!

The config looks good at this point..always it needs a whole config to verify the connectivity..All the questions answers to "YES"..Pl. visit following url for more config and troubleshooting tips

http://www.cisco.com/warp/public/793/access_dial/ddr_dialer_profile.html

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