12-18-2007 05:49 AM - edited 03-03-2019 07:58 PM
Basically, I m using two routers, router A and router B. Lease line on router A while ISDN on router B. On production time, only lease line is used as primary route. But, if lease line fails, all traffic will route to router B to trigger the ISDN. Really need all experts here to help on how to create the routing to establish this design. Thank you.
12-18-2007 05:54 AM
I believe that your requirements can be solved through HSRP and does not require any special routing logic. You will want to configure HSRP on the LAN interfaces. You will want to set priority so that router A with the leased line is the primary/active router and that router B is the standby (I suggest priority of 105 on router A and the default of priority 100 on router B). You will want to configure tracking on router A to track the serial interface. If the serial interface fails then router A will reduce its priority and you want the priority of router B to be higher than router A at this time. You will want to configure HSRP preempt on router B so that it can take over if the priority of router A is lowered. And you will want to configure preempt on router A so that when the leased line recovers that router A can resume as the active router.
If you configure those things I believe that you will satisfy your requirements.
HTH
Rick
12-20-2007 11:28 PM
Hi Rick,
Thanks so much!!
12-18-2007 06:16 AM
You can use Dialer Watch for ISDN.
Sample configuration and more information here:
Config watches the routing table and presence of the route in there.
12-18-2007 06:30 PM
Hi Slidesv,
I cant access the link since it needs an authentication. Really need your help. Thank you.
12-18-2007 09:40 PM
aansatosorigin,
same url from Slidesv without cco login...
http://www.cisco.com/en/US/tech/tk801/tk133/technologies_configuration_example09186a008009455e.shtml
regards,
Sean khoo
12-20-2007 07:36 PM
Thanks Sean! Really helps.
12-19-2007 06:40 AM
Hi buddy,
we can configure this thing in very simple way. configure the serial interface and for isdn configure BRI interface or creat the dialer and bind the dialer inside the serial interface as a backup line. give delay command. all traffic will go vis serial interface and once lease line will go down it will trigure the isdn to handle the traffic and once lease line will up again Lease line will take up the responsibility.
int s0/0
backup int d1
bacup delay 3 10
hth
regards...Mukesh
12-19-2007 07:17 AM
Mukesh
If you read the original post the leased line is on router A and the ISDN is on router B. Backup interface will not work when the primary is on one router and the backup is on another router.
HTH
Rick
12-19-2007 06:53 AM
Hi,
I go with Rick recommendation. I have that setup in a production, works like a charm and no sweat at all. Unless you want to explore a more complicated configuration with dynamic routing, etc..
Regards,
Dandy
12-20-2007 07:34 PM
Hi Dandy,
If dont mind, I really2 interested to know how HSRP configuration using dynamic routing.Hope you happy to share. Thank you.
12-20-2007 08:09 PM
Hi,
Here is some link.
If both lines in the same router
http://www.cisco.com/warp/public/129/bri-backup-map-watch.html
Each line in different router. I was planning this, until I found a simple setup using HSRP as what Rick recommended. In the LAN, since OSPF is use, it doesn't matter whether you use HSRP or not
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094052.shtml
Troubleshooting Demand Circuit keeps bringing up the link
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a008009481b.shtml
Advantages and disadvantages
http://www.cisco.com/warp/public/123/backup-main.html
Regards,
Dandy
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide