Solved: Back-up Route.

mazhar mahadik · ‎07-12-2010

Hi ,

I have a scenarion , R1------R2---( private cloud)----R3------R4

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Description --- 1)R1,R2 are at one site , R2 connects to private cloud.

2) R3,R4 are at another site , R3 connects to private cloud.

3) R1 n R4 have back-up secondary high cost link connection.

Query -- R1 has default route towards R2 ( for internet and all destination of R4(site 2)) , also R1 have wireless slow link with R4.

i dont have access to R2. how can i route traffic for Site 2 destinations on R1 via wireless link If R2 losses its connection to cloud.

NOTE - i dont have access to R2 and there is no dynamic protocol running.

Thanks in Advance,

Mazhar.

wang baojun · ‎07-12-2010

hello ,

we can use cisco ip sla technology. use route track feature.

reference to , http://www.cisco.com/en/US/partner/docs/switches/lan/catalyst4500/12.2/44sg/configuration/guide/swipsla.html

ip sla 1

.....

ip route 0.0.0.0 0.0.0.0 R2-IP track 10

ip route 0.0.0.0 0.0.0.0 R4-IP 111 track 20

when track 10 down, the route "ip route 0.0.0.0 0.0.0.0 R2-IP" will disappear in route table ,they the route "ip route 0.0.0.0 0.0.0.0 R4-IP" install .

View solution in original post

saquib.tandel · ‎07-12-2010

Hi

I got a question.

How does it work when a routing protocol is applied between R1--to---R2 and R1---to---R4

example Eigrp and OSPFas Routing Protocol...

View solution in original post

wang baojun · ‎07-12-2010

hello ,

we can use cisco ip sla technology. use route track feature.

reference to , http://www.cisco.com/en/US/partner/docs/switches/lan/catalyst4500/12.2/44sg/configuration/guide/swipsla.html

ip sla 1

.....

ip route 0.0.0.0 0.0.0.0 R2-IP track 10

ip route 0.0.0.0 0.0.0.0 R4-IP 111 track 20

when track 10 down, the route "ip route 0.0.0.0 0.0.0.0 R2-IP" will disappear in route table ,they the route "ip route 0.0.0.0 0.0.0.0 R4-IP" install .

saquib.tandel · ‎07-12-2010

Hi

I got a question.

How does it work when a routing protocol is applied between R1--to---R2 and R1---to---R4

example Eigrp and OSPFas Routing Protocol...

mazhar mahadik · ‎07-12-2010

CASE 1 - If same routing protocol is running between all routers then no further tracking is required, protocol will take care of convergence.

CASE 2 - If routing protocol is running only btwn R1--R2 , R3--R4 , and R2 is not advertizing R4 destinations to R1 then similar tracking suggested by wang is required.

Hope i m not confusing.

Thanks,

Mazhar

mazhar mahadik · ‎07-12-2010

Hey thanks wang for your reply,

u mean i shld track the ip sla n if sla is down thru R2 then it will install higher admin distance R4 route.

let me try this n come back to you.

mazhar mahadik · ‎07-13-2010

Hey thanks wang ,

i tryied it n it works, this is a smart solution, thanks for your help.

Regards,

Mazhar.