Back-up Route.

Answered Question
Jul 12th, 2010

Hi ,



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

                                 |                                                   |

                                 |---------------------------------------------------|-



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.

Correct Answer by saquib.tandel about 6 years 7 months ago

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...

Correct Answer by wang baojun about 6 years 7 months ago

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 .

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Correct Answer
wang baojun Mon, 07/12/2010 - 02:53

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 .

Correct Answer
saquib.tandel Mon, 07/12/2010 - 03:00

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 Mon, 07/12/2010 - 04:10

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 Mon, 07/12/2010 - 03:17

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 Tue, 07/13/2010 - 01:07

Hey thanks wang ,


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


Regards,

Mazhar.

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