Will enabling flow controll on Cisco switch port disrupt current connections?

Will enabling flow control on Cisco switch port disrupt current connections? I don't want to disrupt traffic during production hours if possible but need to get this enabled on 3 switches ASAP.
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MitchelWAsked:
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Nayyar HH (CCIE RS)Network ArchitectCommented:
No test/spare equipment you can test this on? Its the safest way!

It doesnt seem to be a feature that would require the interface to bounce but under high traffic loads i wouldnt be surprised if some packets were dropped. So there is an element of risk so in summary what i'm saying is i wouldnt do it if i were in your shoes try securing downtime from the business. Redundant network connections between devices play a role here if you have them in place.
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MitchelWAuthor Commented:
I do have redundant connections. This is on my iSCSI SAN network. All devices have multiple connections. Some how not all ports on the switches have flow control enabled. I think I'll do it off hours though. But you are thinking that enabling will not cause a port to reset or anything, just that since the config is changing there is a chance of a few dropped packets?
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Nayyar HH (CCIE RS)Network ArchitectCommented:
Yeah there is a potential risk if you consider a highly utilized link and enabling flow control on link, there could be a point were one side is sending pause frame while the other side does not respond to them which may or may not result to some packets being lost.
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VCyrusCommented:
what i recommended u to is to follow the proper procedure and announce a maintenance downtime of 15 min on that link ,, to avoid any inconvenience and give u the time to do everything properly and at ease ...
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MitchelWAuthor Commented:
Thanks to all.
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