ISDN Multilink - ppp callback

From: Keane, James (James.Keane@agriculture.gov.ie)
Date: Thu Feb 17 2005 - 13:00:22 GMT-3


I have experiencing a strange problem with multilink and callback, My issue is that the call isnt being droped when the idle timer expires, well to tell the truth I dont even see the idle timer !
My first question is why do I see 'Unavail', My second question is why doesnt the line drop (my thinking was that the idle timer isnt expiring). Anybody seen anything like this before ?

When I don't use multilink I DO see the timers and all behaves normally.

Thanks in advance

James Keane

Network Support
Network Services Group
Information Services Division
R5 - 2 Centre
Agriculture House
Kildare St
Dublin 2

============================================================================================================
SOHO router (803) calling a Central Site (3640) with multilink and callback enabled (both sides)

after the call and callback occur I get

on the SOHO
--------------------------------------------------------------------------------
                                ISDN ACTIVE CALLS
--------------------------------------------------------------------------------
Call Calling Called Remote Seconds Seconds Seconds Charges
Type Number Number Name Used Left Idle Units/Currency
--------------------------------------------------------------------------------
In 6441234 16471980 ISDNDial 2299 Unavail -
--------------------------------------------------------------------------------

Central Site

--------------------------------------------------------------------------------
Call Calling Called Remote Seconds Seconds Seconds Charges
Type Number Number Name Used Left Idle Units/Currency
--------------------------------------------------------------------------------
Out ---N/A--- 6471980 JKDELETE 2428 Unavail - 0

============================================================================================================
Configs are

        Central Site :

interface Dialer2
 description Ph 6441234 Isdn Access Number
 ip address 192.193.100.240 255.255.255.0
 encapsulation ppp
 dialer in-band
 dialer idle-timeout 900
 dialer enable-timeout 12
 dialer map ip 192.193.100.63 name JKDELETE class agparams1 broadcast 6471980
 dialer map (many other maps)
 dialer-group 2
 no peer default ip address
 no cdp enable
 ppp callback accept
 ppp authentication chap
 ppp chap hostname ISDNDial
 ppp chap password XXXXXXXXXXX
 ppp multilink
access-list 106 permit icmp any any
dialer-list 2 protocol ip list 106

        SOHO Site:

interface Dialer0
 ip address 192.193.100.63 255.255.255.0
 encapsulation ppp
 dialer pool 1
 dialer idle-timeout 900
 dialer enable-timeout 50
 dialer string 6441234
 dialer hold-queue 100
 dialer load-threshold 50 either
 dialer-group 1
 no peer default ip address
 no cdp enable
 ppp callback request
 ppp authentication chap
 ppp multilink
access-list 123 permit icmp any any
access-list 123 lots of email servers/web servers included here
dialer-list 1 protocol ip list 123

================================================================================================

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