Load balance on 3750 over 2 ISP

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Mar 31st, 2010
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I got 2 sites, both with 3750 installed and they are connected using 2 ISP. I found the command "ip load-sharing per-packet" is not supported on 3750. How can I distribute traffic evenly over the 2 links?

Correct Answer by paolo bevilacqua about 7 years 1 month ago

Per-flow balancing, that is the optimal method.


Per-packet introduces out-of-order arrival and must be avoided.


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paolo bevilacqua Wed, 03/31/2010 - 07:50
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You cannot, beside a 3750 is not apt for connecting to ISP.

y.lo Wed, 03/31/2010 - 07:59
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So there is nothing we can do to make the situation better? Would disabling route cache help a bit?

Also, there seems to be a table that stores the destination address of traffic. Would this table has a timeout value? Thanks.

paolo bevilacqua Wed, 03/31/2010 - 08:28
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You have a L3 switch, there is no route cache and stuff like that.


The device is already operating at its best, if you want more options, get a true router.

y.lo Wed, 03/31/2010 - 08:34
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Thanks for your reply. What if there are 2 or more optimal routes to the same destination network? How would it forward the packet?

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paolo bevilacqua Wed, 03/31/2010 - 08:41
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Per-flow balancing, that is the optimal method.


Per-packet introduces out-of-order arrival and must be avoided.


Please remember to rate useful posts clicking on the stars below.

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