ISDN Dialer Idle-timeout

[mnlatif]

Hi,

We have Cisco 2611 XM (12.2(8)T10) acting as backup ISDN Router. The remote site routers dial-in to this router when the Serial Link fails at those sites. We have the "dialer idle-timeout" parameter set to 180 at both ends.

However during an Active ISDN Connection with traffic flowing the Idle-timeout counter still keeps on Increasing and dis-connects the line after 180 seconds, the connection gets established immediately again but then its disconnected again after 180 seconds.

It seems that the router fails to recognize that the traffic is flowing and considers the link Idle and keeps on increasing the idle-timeout counter.

Any ideas ?

The configuration at the Server end is

"

interface Serial1/0:15

ip address 192.168.1.17 255.255.255.240

no ip redirects

no ip unreachables

encapsulation ppp

dialer idle-timeout 180

isdn switch-type primary-net5

ppp authentication chap

"

[peterledwidge]

Is it a specific traffic type your using to activate the connection?

Check

http://www.cisco.com/en/US/products/sw/iosswrel/ps1834/products_feature_guide09186a008007ffd1.html

HTH

[Kevin Dorrell]

You need to specify a dialer-list to define interesting traffic, and then attach it to the interface with a dialer-group command. If the dialer does not see interesting traffic, then it will idle out the call, regardless of who set up the call in the first place.

The simplest way to keep the line open is to put dialer-group 1 on the interface, and dialer-list 1 protocol ip permit globally.

http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_command_reference_chapter09186a008008000e.html#wp1042890

"Only packets that match the dialer group reset the idle timer."

Kevin Dorrell

Luxembourg