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New Member

3rd Routing for the route to go..

Hi,

Just wanna confirm here..Lets say if i have a Serial and Backup ISDN with route of

172.16.0.0 255.255.255.0 192.168.0.2

172.16.0.0 255.255.255.0 Dialer 1 10

Can I add another route of

172.16.0.0 255.255.255.0 192.168.1.2 100

As my objective is to put another serial WAN Interface to connect to another backup site in case this 2 links are down.

What i am afraid is, Will the route kicks off if the primary serial and ISDN down?

TIA.

ken

5 REPLIES
Bronze

Re: 3rd Routing for the route to go..

hi

what you are trying to do is correct , i mean the static floating route with an AD of 254 preferable than 100, will do the job in the case of the 172.16.0.0/24 learned by the backup or the first serial interface disapears from the routing table.

so the static floating route will take its place in the routing table quickly.

also you can achieve that using dialer-watch lists.

HTH

please do rate if it does clarify

New Member

Re: 3rd Routing for the route to go..

Thanks Kamal for your reply.

Meaning if the interface at the remote side are down, Serial and ISDN both down together,

I can use the 3rd Route,

172.16.0.0 255.255.255.0 192.168.1.2 100 to push the route to this 2nd Serial Interface?

And how can i achieve using dialer-watch lists?

thanks again.

ken

Bronze

Re: 3rd Routing for the route to go..

Ken

yes indeed if the 1st serial interface is down and its isdn backup interface is down that means the route 172.16.0.0 gotten on those links will disappear , and automatically the other one you ve configured with a administrative distance of 100 will be placed in the routing table so traffic will be forwarded using this 2nd serial interface, in this solution you have used what we call static floating, so dialer watch-list is another way to achieve that but it functions only with IGRP/EIGRP/OSPF but i m not sure you can do it using serial lines here is link for more info : http://www.cisco.com/en/US/products/sw/iosswrel/ps1828/products_configuration_guide_chapter09186a00800872ed.html

HTH

please do rate if it does clarify

New Member

Re: 3rd Routing for the route to go..

ideally serial interfaces are dedicated interfaces for usage and irrespective of the usage or not we pay the charge. So generally people go in for primary interfaces of serial. Incase you have two serial interfaces u can use them as the primary and the secondary with their corresponding metrices. The isdn can be configured as the tertiary.

Dialer watch list is nothing but tracking an interface on the router whose failing sould trigger the isdn. It is similar to the backup interface configured on the primary links.

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fdial_c/fnsprt6/dcdbakdw.htm

Bronze

Re: 3rd Routing for the route to go..

hi jarvar832004

i thinks you should write tracking a route instead of tracking an interface .

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