backup Internet connection

Answered Question

Hi,


Can nyone tell me wht would be the best way to configure backup internet link.No load sharing required.I want the backup link to become active when primary fails.


thanks

Correct Answer by Ganesh Hariharan about 7 years 3 hours ago

Thanks a lot Ganesh for your help so far.Few more doubts I have.


Service Provider need to configure anything at their end for this to work?

can we do same failover using LACP?

thanks


No configuration is required at services provider end, all the configuration need to be done at your end router.Can you calrify what exactly the question  for failover using LACP?


Ganesh.H

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Ganesh Hariharan Mon, 05/24/2010 - 01:05
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Hi,


Can nyone tell me wht would be the best way to configure backup internet link.No load sharing required.I want the backup link to become active when primary fails.


thanks


Hi Vicky,


You can achive with the help of PBR in router,check out the below link for more information on configration


http://pierky.wordpress.com/2009/03/28/dual-wan-connection-on-cisco-with-policy-based-routing-pbr/


http://www.cisco.com/en/US/docs/ios/12_0/qos/configuration/guide/qcpolicy.html


Hope to help !!


Ganesh.H


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Ganesh Hariharan Mon, 05/24/2010 - 01:29
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Ganesh,what if I go for floating static routing.this wouldnt solve my problem?


thanx

Yes you can achive the same if you want only failover,Floating routes are secondary routes that are used by a router to reach a destination if the primary route fails. Floating routes are configured just as static routes are; however, an administrative distance (AD) is configured with the static route.


Hope to help !!


Ganesh.H


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Ganesh Hariharan Mon, 05/24/2010 - 01:39
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I can configure both as static routes one with higher AD ..right?


Yes you are right,check out the below link for sample configuration on floating static routes


http://www.cisco.com/en/US/tech/tk801/tk133/technologies_tech_note09186a008009457d.shtml#floating_sampleconfigs


http://www.cisco.com/en/US/tech/tk801/tk133/technologies_configuration_example09186a0080093d6e.shtml


Hope to help !!


Ganesh.H


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Ganesh Hariharan Mon, 05/24/2010 - 05:14
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There is a problem here,


Both the links are Ehternet links.Will Static route can detect failure on ethernet link.?? please advice



thanks


Configure ip sla track in router for monitoring the link and automatic failover to secondary link


ip sla 1  
icmp-echo any ip address
timeout 500 
frequency 3
ip sla schedule 1 start-time now life forever
track 1 rtr 1 reachability 


Now for the routing, we need to configure a default route and associate it with the tracker


ip route 0.0.0.0 0.0.0.0 1.1.1.1 track 1


Then we need to add our secondary route


ip route 0.0.0.0 0.0.0.0 1.1.1.2 10


Hope to Help !!


Ganesh.H


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Correct Answer
Ganesh Hariharan Mon, 05/24/2010 - 23:48
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Thanks a lot Ganesh for your help so far.Few more doubts I have.


Service Provider need to configure anything at their end for this to work?

can we do same failover using LACP?

thanks


No configuration is required at services provider end, all the configuration need to be done at your end router.Can you calrify what exactly the question  for failover using LACP?


Ganesh.H

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