Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

ISDN Dialer-List Query

When you setup an Dialer Interface should the bandwidth statement be equal to the number of ISDN Channels available or equal to a single ISDN Channel.

The reason being that we are having issue's where we have "dialer load-threshold 80 either" we find the link doesn't come up when the first ISDN channel is full, it works at load-threshold 30. My theory is that the cisco uses the bandwidth statement to calulate when to bring the next channel up. What is the best practice in this situation?

<example of elements of the dialer config>

interface Dialer1

bandwidth 256

dialer load-threshold 80 either

dialer max-call 4

dialer-group 1



Re: ISDN Dialer-List Query

You are correct. Cisco uses the bandwidth statement to calulate the load and in turn, that is used to bring up multiple channels.

The best method to bring up multiple bri-interfaces is to set the dialer load-threshold to a very low value, such as 1 or 2. Using a higher value will probably result in connections dropping and reconnecting all the time which generates at least the same amount of costs and gives a lower performance.



Cisco Employee

Re: ISDN Dialer-List Query

Bandwidth command under the interface will be used to calculate routing matrics/costs only. It will not effect any load calculus set using "dialer load-threshold" . Router should bring up the 2nd channel once the load on the 1st channel increased beyond 80/255.

Keep issuing "sh interface brix:1" to see the load on that channel.

CreatePlease login to create content