Negative impact of enabling flow control?

Unanswered Question
Dec 29th, 2008

Is there any negative impact of enabling flow control on a 3750? I noticed that it only supports inbound packets.

Thanks!

John

I have this problem too.
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John Blakley Tue, 12/30/2008 - 06:20

Thank you for the reply Edison. I think the main question that my management had is if we can enable across all ports and get better throughput. I don't think it's a good idea to enable across all ports, but what are your thoughts?

John

Edison Ortiz Tue, 12/30/2008 - 07:41

I don't think it's a good idea to enable across all ports

Why do you feel this way after reading what it does?

My thoughts are, if you are experiencing congestion and dropped packets - Flow Control is a great tool to inform the sending partner to slow down its transmission. To me, that is a great benefit.

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Edison.

John Blakley Tue, 12/30/2008 - 07:45

I don't necessarily "feel" that way. We don't have congestion on the network that requires this to be enabled, and I've read other forums where people have enabled it and it caused problems.

I always get concerned when I enable something that is disabled by default.

John

Edison Ortiz Tue, 12/30/2008 - 07:57

I always get concerned when I enable something that is disabled by default.

It's disabled by default because the behavior is hardware specific.

For instance, in the 3750 - it only allows you to receive pause frames, not send - while in the 6500 switch, you can send and receive pause frames.

Flow Control is just a quick and dirty QoS Layer2 mechanism - how do you feel about QoS? :)

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Edison.

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