07-14-2008 03:01 AM - edited 03-06-2019 12:10 AM
Hi all, I have seen my isp's router today, there config seems to have no static routes with a higher admin distance than BGP as I would suspect, to stop the updates bringing up the line. how would they achieve this? as the line only comes up when the primary fails.
cheers
07-15-2008 09:42 AM
can anyone help me with this as all?
07-15-2008 12:50 PM
Hello Carl,
they are using some form of DDR Dial on Demand Routing or simply the backup command to declare that the isdn is the backup of main interface.
Then, with isdn you can define in a dialer-list what traffic is interesting (= will reset the idle timeout). Usually the idea is to use an extended ip acl where you deny the routing protocol so that BGP keepalives will not keep the ISDN line up all the time.
Look at the following link
http://www.cisco.com/en/US/docs/ios/11_3/dial/configuration/guide/dchowddr.html
Hope to help
Giuseppe
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