ISDN Backup

Answered Question
Mar 17th, 2009
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Hi All


I have Cisco 1841 Router configured and it is working fine. It is having a serial Interface in the router connected to my Head Office. I am having 2 Mbps Point to Point Lease Line Link connected. It is working as a branch router.

I am using static routing. I like to have ISDN backup for the primary link.

I am aware that ISDN will dial only based on the interested traffic. In my scenario, the traffic is not generated from this router. From Core router only traffic is initiated and this router is accessed.


Thus the ISDN is not triggering when the primary link goes down as there is no interested traffic. What is the solution to automize it. Is there any way to keep generating interested traffic from this router.


R.B.Kumar


Correct Answer by Giuseppe Larosa about 8 years 2 weeks ago

Hello R.B. Kumar,


you should implement an rtr or ip sla object that tries to ping some address in the central office


see


http://www.cisco.com/en/US/docs/ios/12_4/ip_sla/configuration/guide/hsicmp.html


in this way you can have a ping always going that can match interesting traffic definition and can trigger a call


Hope to help

Giuseppe


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Giuseppe Larosa Tue, 03/17/2009 - 04:02
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Hello R.B Kumar,

you should define the ISDN BRI interface as the backup of the serial interface.


see


http://www.cisco.com/en/US/docs/ios/dial/configuration/guide/dia_backup_serial_ps6350_TSD_Products_Configuration_Guide_Chapter.html#wp1000990



remember to define interesting traffic on both sides


Hope to help

Giuseppe


hclisschennai Tue, 03/17/2009 - 04:27
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Hi Giuseppe,


Thanks for your response.


The problem is from 1841 Router there is no interested traffic. Only from Head office people will access the branch office where our 1841 lies.


In this case we have to manually keep generating interested traffic.


As you mentioned, i have configured the interfaces. But the problem is we donot have any interested traffic generated from 1841.


Is there any script or any other way to generate traffic from the router


R.B.Kumar

Correct Answer
Giuseppe Larosa Tue, 03/17/2009 - 06:15
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Hello R.B. Kumar,


you should implement an rtr or ip sla object that tries to ping some address in the central office


see


http://www.cisco.com/en/US/docs/ios/12_4/ip_sla/configuration/guide/hsicmp.html


in this way you can have a ping always going that can match interesting traffic definition and can trigger a call


Hope to help

Giuseppe


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