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Removing "Dialer Map" Command

I have one headquarter router (HQ) and two branch routers (SLS and IBP).

These 2 branch routers are connected to HQ via ISDN.

HQ uses PRI interface meanwhile SLS and IBP use BRI interfaces.

The branch routers will trigger link if there is interesting packet.

The ISDN configuration in HQ is:

username SLS password cisco

username IBP password cisco

interface Serial1/1/1:15

ip address 43.68.105.1 255.255.255.0

encapsulation ppp

dialer idle-timeout 60

dialer map ip 43.68.105.2 name SLS

dialer map ip 43.68.105.8 name IBP

dialer hold-queue 5

dialer-group 1

ppp authentication chap

ppp multilink

hold-queue 75 in

dialer-list 1 protocol ip permit

The ISDN configuration in SLS is:

username HQ password cisco

interface BRI0

ip address 43.68.105.2 255.255.255.0

encapsulation ppp

dialer idle-timeout 60

dialer map ip 43.68.105.1 name HQ 68575757

dialer load-threshold 128 either

dialer-group 1

ppp authentication chap

ppp multilink

hold-queue 75 in

dialer-list 1 protocol ip permit

The ISDN configuration in IBP is:

username HQ password cisco

interface BRI0

ip address 43.68.105.8 255.255.255.0

encapsulation ppp

dialer idle-timeout 60

dialer map ip 43.68.105.1 name HQ 68575757

dialer load-threshold 128 either

dialer-group 1

ppp authentication chap

ppp multilink

hold-queue 75 in

dialer-list 1 protocol ip permit

The problem is:

SLS router can connect to HQ successfully, but IBP router cannot.

If I see the debug ISDN and PPP, the status of BRI is connected and PPP authentication is successful.

The PPP negotiation is also successful, and the status of IPCP is open.

But, if I remove "dialer map ip 43.68.105.8 name IBP" command in HQ router, IBP can connect successfully.

It is very weird, because the configuration of SLS and IBP are same.

The difference between SLS and IBP is in IOS.

HQ and SLS use IOS version 11.3, meanwhile IBP uses the newest IOS which is 12.2(7a).

Is the cause of this problem the IOS incompatibility?

1 REPLY
Cisco Employee

Re: Removing "Dialer Map" Command

IOS difference shouldn't be a problem..Need to see the "debug ppp nego" and "debug ppp auth" closely for IPCP..If nothing worksout at all, try to have the same ios..Thx..Tejal

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