Re: ADSL failover scenerio

hi Noor,

I guess it depends on the IOS version you're using, but 12.4 supports
these commands:

route-map INTERNET_POLICY permit 10
 match ip address STUDENT_ACL_EVEN
 set ip next-hop verify-availability 10.10.34.140 1 track 1
 set ip next-hop verify-availability 10.10.34.145 2 track 2
 set ip default next-hop 10.10.34.150

check the command reference for these commands, you should be able to
meet your requirements with them... especially with the sequence to
insert into next-hop list numbers

hth

-Bobola Oke

On 9/30/10, Khurram Noor <engr.khurramnoor_at_googlemail.com> wrote:
> Hello Everyone,
>
> I want to discuss a scenerio is which i have to distribute traffic incoming
> from 3 different VLans, to three ADSL links and one leased line. i was able
> to distribute traffic from all these vlans using policy based routing and by
> distributing clients onto these circuits on odd and even ip basis. Below is
> the clarification.
>
> ADSL1---> Even Students,
> ADSL2---> Odd Student
> ADSL3---> Even Staff, All Guest
> LL----------> Odd Staff
>
> After achieving this, the requirment is to perform a failover of internet
> traffic to another link incase any of these link fails. Like if ADSL1 fails,
> the even students internet traffic should automatically start passing
> through ADSL2 that is used for odd students and vice versa. Same goes for
> Staff and Guests. I thought that i can achieve this using ip sla. I created
> ip sla's for testing a icmp to a internet address using one of the inside
> interface through the gateways of each dsl and lease line circuit. I made a
> track object to check for the status. But now the problem is that how can i
> use this tracking object to change policy based routing desicion. Is there a
> way to use this track object inside route-map? Below is the hint of my
> configuration.
>
> This is one of the three IP sla for a adsl circuit test.
>
> ip sla 1
> icmp-echo 8.8.8.8 source-ip 10.10.34.140 [lan ip adsl router 1]
> threshold 500
> timeout 1000
> frequency 1
> ip sla schedule 1 life forever start-time now
> !
> track 1 ip sla 1 reachability
> delay down 10 up 10
> !
>
> How can i use it to change the decision in the below route-map, so if there
> is no icmp recieved from 8.8.8.8 using source ip of 10.10.34.140 it should
> send the request to the other adsl router 10.10.34.141.
>
> ip access-list extended STAFF_ACL_EVEN
> permit ip 10.10.12.0 0.0.0.254 any
>
> route-map INTERNET_POLICY permit 10
> match ip address STUDENT_ACL_EVEN
> set ip next-hop 10.10.34.140
> !
>
> I hope someone had some experience doing this.
>
> --
> Khurram Noor
> CCIE # 24419
>
> http://www.linkedin.com/in/khurramnoor
>
>
> Blogs and organic groups at http://www.ccie.net
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-- 
Bobola Oke
Blogs and organic groups at http://www.ccie.net