RE: ISDN problem

From: simon hart (simon.hart@btinternet.com)
Date: Fri Mar 11 2005 - 14:36:32 GMT-3

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James,

The Spid does not have to be the same as the dialled number. Quite often
they are the same, however this is not a necessity

S.

-----Original Message-----
From: Walker, James - Is [mailto:JWALKER2@PARTNERS.ORG]
Sent: 11 March 2005 17:26
To: simon hart; Group Study
Subject: RE: ISDN problem

Besides what others have pointed out, ISDN spid1 on R5 is 2122 but R4 is
dialing
2222.

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
simon
hart
Sent: Friday, March 11, 2005 12:02 PM
To: Group Study
Subject: ISDN problem

Hi all,

I am having a bit of a nightmare with some simple ISDN configuration: I am
trying to establish a connection between two routers R4 and R5. R5 should
not be able to initiate a call - only R4. I am using legacy DDR, configs
below

Frame_R4#
!
interface BRI0
 ip address 187.1.45.4 255.255.255.0
 encapsulation ppp
 dialer map ip 187.1.45.5 name Rack1R5 broadcast 2222
 dialer-group 1
 isdn switch-type basic-ni
 isdn spid1 1211
end
!
dialer-list 1 protocol ip permit

Rack1R5#
!
interface BRI0/0
 ip address 187.1.45.5 255.255.255.0
 encapsulation ppp
 dialer idle-timeout 0
 dialer map ip 187.1.45.4 name Rack1R5 broadcast
 isdn switch-type basic-ni
 isdn spid1 2122
end

If I ping from Frame_R4 then the ISDN line is brought up but no response to
the pings. If I debug IP packet on R5 I notice that I have an encapsulation
failure:
Rack1R5#
*Mar 1 07:52:46.460: IP: s=187.1.45.4 (BRI0/0), d=187.1.45.5 (BRI0/0), len
100, rcvd 3
*Mar 1 07:52:46.460: IP: s=187.1.45.5 (local), d=187.1.45.4 (BRI0/0), len
100, sending
*Mar 1 07:52:46.460: IP: s=187.1.45.5 (local), d=187.1.45.4 (BRI0/0), len
100, encapsulation failed
Rack1R5#
*Mar 1 07:52:48.459: IP: s=187.1.45.4 (BRI0/0), d=187.1.45.5 (BRI0/0), len
100, rcvd 3
*Mar 1 07:52:48.459: IP: s=187.1.45.5 (local), d=187.1.45.4 (BRI0/0), len
100, sending
*Mar 1 07:52:48.463: IP: s=187.1.45.5 (local), d=187.1.45.4 (BRI0/0), len
100, encapsulation failed

As you can see it is showing an encapsulation failure, however the map looks
fine and the config is exactly as dictated within the solution guide of the
Internetwork expert solution guide

Any comments most welcome

S.

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