Question

WAN redundancy with Floating Static Routes -LAN EXTENSION

Asked by: 1w3

Hi

I have configured Floating static routes with for failover scenario between two sites.When I unplugged the PRIMARY CONNECTION cable from SITE A then I could not see SITE B using BACKUP CONNECTION until I asked somebody to UNPLUG the PRIMARY CONNECTION cable from SITE B.Does this mean that FAILOVER will not kick in until both sides of the cable of a connection are disconnected ?

Thanks

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Asked On
2009-11-04 at 05:01:56ID24870686
Topics

Network Routers

,

Network Switches & Hubs

Participating Experts
3
Points
500
Comments
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Answers

 

by: donjohnstonPosted on 2009-11-04 at 05:14:08ID: 25738933

Correct. A static route will stay in the routing table until the physical interface goes down. So while the packets were using the backup path from Site A to Site B, the returning packets were still trying to use the primary path.

You'll need to use object tracking to achieve your goal.

http://www.cisco.com/en/US/docs/ios/12_3/12_3x/12_3xe/feature/guide/dbackupx.html

 

by: bsohn417Posted on 2009-11-04 at 05:17:02ID: 25738955

This will only work if the local connection fails, if you want to have redundent route you will need to lookin to IP SLA.

this will continue ping the other router if the link fails it will take 2nd path.

in most cases it not the local link it more telco link that fails.

 

by: rsivanandanPosted on 2009-11-04 at 05:32:07ID: 25739064

What networking devices are we looking at?

Cheers,
rsivanandan

 

by: 1w3Posted on 2009-11-04 at 05:45:58ID: 25739196

donjohnston:

This is the link I used to implement redundancy but this doesn't talk about shutting interface on both sides
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800ef7b2.shtml

 

by: 1w3Posted on 2009-11-04 at 05:48:16ID: 25739214

bsohn417:

Does my config work if TELCO fails rather than local interface ?

 

by: 1w3Posted on 2009-11-04 at 05:48:24ID: 25739215

rsivanandan:

 

by: 1w3Posted on 2009-11-04 at 05:49:03ID: 25739227

rsivanandan:

They are switches using routed interfaces

 

by: bsohn417Posted on 2009-11-04 at 05:50:40ID: 25739253

verizon or ATT?
what devices?

 

by: donjohnstonPosted on 2009-11-04 at 05:52:37ID: 25739268

That link only deals with creating a floating static route... Which won't work unless the interfaces go down on both ends.

You have to use object tracking.

http://www.cisco.com/en/US/docs/ios/12_3/12_3x/12_3xe/feature/guide/dbackupx.html#wp1051044

 

by: 1w3Posted on 2009-11-04 at 05:58:33ID: 31649952

Understood

20120131-EE-VQP-002

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