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New Member

1 ISDN E1 monitoring two serial links


I need my Ibackup SDN line to monitor two Serial links (which are terminated on the same routers on both ends), in which the ISDN link will kick up if either of the Serial link is down.

I did found the example on the Cisco website, but the two serial links were terminated on different routers, so the configuration provided did not really work. The router did not allow me to configure the same router remote-name on two different dialer interfaces.

Is there any example that I can refer to which relates to my scenario?



Re: 1 ISDN E1 monitoring two serial links

I think that either of the two examples on the URL's below should work for you. Look at these and see which one fits your needs.

New Member

Re: 1 ISDN E1 monitoring two serial links

Thanks for the help. But it doesn't help, cos it doesn't match my requirement.

my requirement is that my ISDN line needs to monitor two serial links, and and not one serial link.


Re: 1 ISDN E1 monitoring two serial links

Do we have ppp multilink configured between these two links? Basically want to know whether the two serial links have different ip addresses or have one ip address that is assigned to the multilink bundle.

If they have different addresses then can have the dialer watch to watch these individual directly connected networks.

say, serial0 is & serial will appear as directly connected networks but when they go down the dialer watch will initiate an isdn call....I guess from the routing presepective this will become complex.

conf term


dialer watch-group 100

dialer watch-list 100 ip

dialer watch-list 100 ip

Now if s0 or s1 goes down it will be removed from the routing table to initiate an isdn call. The show run on one end should be useful.

Thanks, Mak.

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