Should I use Flow Control between switches ?

Unanswered Question
Jun 11th, 2007


I have read that Flow Control helps to prevent buffer issues on the receiving device by using a pause frame. However I do not know if this is a recommended best practice for Switch to Server connections or Switch to Switch connections.

Cisco say that it compliments QoS in preventing packet loss, however, if a pause frame is send during high utilisation this will also cause a pause in packets that have been marked for QoS traversing switches, so I do not see how this helps.

Has anyone else enabled flow control between Switches on Gig links ?

I have this problem too.
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bjornarsb Mon, 06/11/2007 - 01:22


Flow-control could prevent buffer problems.

But if you have input errors and enable flow control it could result in output errors.

Actually we had a problem with a Gig port once, and when we disabeled layer 2 flow-control we got better performance.

So I quess that you cannot say whats best,

you have to see in practice what the effects are.




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