Voip Dual links

Answered Question
Sep 25th, 2008
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have 2 x 2MB links. They are currently load balanced. If I run voice across, am I correct in assuming that voice conversations will get split across the link and therefore packets will have varied delay and also could arrive out of order. If so Is there a way around it?

I do not want to have vocie going out just 1 link.

Correct Answer by Brandon Buffin about 8 years 9 months ago

You are correct that this can be a problem with load balanced links. It depends on whether you're using per-packet or per-destination load balancing. The default is per-destination. With per-dstination, traffic between a given source/destination pair will traverse the same link. You should not see a problem with voice in this case. Take a look at the following links for further info.


http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/pplb.html


http://www.cisco.com/en/US/tech/tk827/tk831/technologies_tech_note09186a0080094806.shtml


Hope this helps. If so, please rate the post.


Brandon

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Correct Answer
Brandon Buffin Thu, 09/25/2008 - 09:29
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You are correct that this can be a problem with load balanced links. It depends on whether you're using per-packet or per-destination load balancing. The default is per-destination. With per-dstination, traffic between a given source/destination pair will traverse the same link. You should not see a problem with voice in this case. Take a look at the following links for further info.


http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/pplb.html


http://www.cisco.com/en/US/tech/tk827/tk831/technologies_tech_note09186a0080094806.shtml


Hope this helps. If so, please rate the post.


Brandon

pcromwell Thu, 09/25/2008 - 12:25
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Thanks Brandon, So in theory two calls can be present across the 2 links (load balanced)and the same call will not be split across both links.

Brandon Buffin Thu, 09/25/2008 - 12:33
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With per-destination load balancing, that is correct.


Brandon

eljose_lol Tue, 09/30/2008 - 12:37
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hi,

for use per-destination load balancing i most active fast switching in all interface? with "ip route-cache cef" ?

thx

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