×

Warning message

  • Cisco Support Forums is in Read Only mode while the site is being migrated.
  • Cisco Support Forums is in Read Only mode while the site is being migrated.

basic failover question

Unanswered Question
Mar 15th, 2006
User Badges:

hello,

my question is the following, I have a cisco 2600 router connected to a T1 line and a 30 Mbps cablemodem line, I want the cablemodem as my primary connection and the T1 as my backup connection, when the cablemodem goes down, I want the T1 up and running.

I did this with priorities y the ip route command, BUT when I restart the router, the priorities changes, and when the cablemodem goes down and the T1 goes up I have to configure NAT manually. Im a begginner, so I need your help!!

here is my running config




Attachment: 
  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Loading.
pkhatri Wed, 03/15/2006 - 05:12
User Badges:
  • Purple, 4500 points or more

Try the following changes:


no ip nat inside source list 1 pool cablemodem overload

ip nat inside source route-map CABLEMAP pool cablemodem overload

ip nat inside source route-map T1MAP pool t1 overload

!

route-map CABLEMAP permit 10

match ip address 1

match interface

!

route-map T1MAP permit 10

match ip address 1

match interface

!


Hope that helps - pls rate the post if it does.

Paresh

comechivos Wed, 03/15/2006 - 08:26
User Badges:

thank you so much.


should I leave the ip route Priorities????and if I 've to leave them, how can I do to make them static? because they change when I reboot the router.


thanks

pkhatri Wed, 03/15/2006 - 17:15
User Badges:
  • Purple, 4500 points or more

I presume you mean the Administrative Distance when you say priority. I would suggest that you remove it from the primary route and leave it on the secondary route so that it becomes a floating static route.


Hope that helps - pls rate the post if it does.


Paresh

comechivos Wed, 03/15/2006 - 18:19
User Badges:

the problem with that is..... when I remove the administrative distance, appear automatically again with a 254 value, and if I leave it, it changes to 254 too. so, do you know how to make it static?

pkhatri Wed, 03/15/2006 - 18:26
User Badges:
  • Purple, 4500 points or more

Enter in the following:


no ip route 0.0.0.0 0.0.0.0 64.84.44.1 240

ip route 0.0.0.0 0.0.0.0 64.84.44.1


copy run to start


Then, do a 'show run' to see what you get.


Hope that helps - pls rate the post if it does.


Paresh

comechivos Thu, 03/16/2006 - 03:46
User Badges:

I did that already, and when I remove it, appears again automatically with a 254 (maximun) value.


pkhatri Thu, 03/16/2006 - 03:47
User Badges:
  • Purple, 4500 points or more

Can you do a screen capture (log) of what you are typing in, followed by a 'sh run' and then post the output ? There's something weird going on...


Paresh

comechivos Thu, 03/16/2006 - 04:31
User Badges:

I just do what you are saying,


no ip route 0.0.0.0 0.0.0.0 64.84.44.1 240

!

ip route 0.0.0.0 0.0.0.0 64.84.44.1


by the time, everythin is ok, But when I reboot or shutdown the interface and bring it back again the administrative distance changes to 254 again.

thats all I do.

comechivos Thu, 03/16/2006 - 09:55
User Badges:

mm, I think is done, I set the administrative distance of the T1 line to 255, bigger than the cablemoden automatic, so I think its done, but Im not sure, because I cant shut down the router right now, I tested the failover, it worked fine, the only problem was the administrative distance that I think is fixed now.so, tomorrow I ll test everithing.


Thank you so much


comechivos Fri, 03/17/2006 - 03:50
User Badges:

nop, It didnt work with a 255 administrative distance value....


any idea?

pkhatri Fri, 03/17/2006 - 16:24
User Badges:
  • Purple, 4500 points or more

An admin distance of 255 makes the route unreachable. You can use any non-255 AD as long as the AD for the preferred route is less than that for the backup route.


Hope that helps - pls rate the post if it does.

Paresh

comechivos Sat, 03/18/2006 - 08:23
User Badges:

yes I know that, but the cablemodem line has an 254 value, and I cannot change it, when I change it, goes back to 254 automatically., so I need to make that static.

can you understand me? maybe not, because my english is so bad, because I m from Argentina.

sorry about that


pkhatri Mon, 03/20/2006 - 14:49
User Badges:
  • Purple, 4500 points or more

Hi,


Your English is fine, mate :-)


What I am having trouble with is how you keep getting the AD of 254 on your static route. That is very odd and does not work in reality.


Also, I noticed that you posted your config earlier but it seems to have disappeared now. Could you re-post it ?


Paresh

comechivos Tue, 03/21/2006 - 04:02
User Badges:

is there anyway to put the T1 interface in standby?

when the cablemodem fail. the T1 interface set active. and when the cablemodem is up again the T1 interface goes back to standby mode.


is this possible? because the router is routing against the T1 and I dont want that when the cablemodem is up.


here is my running config



Attachment: 

Actions

This Discussion