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Webcast-Catalyst9k
New Member

basic failover question

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

15 REPLIES
Purple

Re: basic failover question

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

New Member

Re: basic failover question

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

Purple

Re: basic failover question

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

New Member

Re: basic failover question

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?

Purple

Re: basic failover question

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

New Member

Re: basic failover question

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

Purple

Re: basic failover question

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

New Member

Re: basic failover question

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.

New Member

Re: basic failover question

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

New Member

Re: basic failover question

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

any idea?

Purple

Re: basic failover question

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

New Member

Re: basic failover question

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

New Member

Re: basic failover question

I knew you were from Argentina/Latin America when I read your first post because you wrote "y" instead of "and". I do that sometimes when I am speaking Spanish.

Thanks for posting your problem... I actually had a question about this same problem and now it is answered.

Cuidate,

Brandon

Purple

Re: basic failover question

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

New Member

Re: basic failover question

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

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