Lenovo Flex System Fabric CN4093 User Manual

304 CN4093 Application Guide for N/OS 8.4
ItisrecommendedthataconfigurationbackupbemadepriortoturningCEEonor
off.Viewingtheconfigurationfilewillallowtheadministratortomanually
re‐createtheequivalentconfigurationunderthenewCEEmode,andwillalsoallow
fortherecoveryofthepriorconfigurationifnecessary.
Effects on Flow Control
WhenCEEisoff(thedefault),802.3xstandardflowcontrolisenabledonallswitch
portsbydefault.
WhenCEEisturnedon,standardflowcontrolisdisabledonallports,andinits
place,PFC(see“Priority‐BasedFlowControl”onpage 312)isenabledonallports
for802.1ppriority
value3.Thisdefaultischosenbecausepriorityvalue3is
commonlyusedtoidentifyFCoEtrafficinaCEEenvironmentandmustbe
guaranteedlosslessbehavior.PFCisdisabledforallotherpriorityvalues.
ItisrecommendthataconfigurationbackupbemadepriortoturningCEEonoroff.

Viewingtheconfigurationfilewillallowtheadministratortomanuallyre‐createthe
equiv a lentconfigurationunderthenewCEEmode,andwillalsoallowforthe
recoveryofthepriorconfigurationifnecessary.
WhenCEEison,PFCcanbeenabledonlyonpriorityvalue3and oneother
priority.If
flowcontrolisrequiredonadditionalprioritiesonanygivenport,
considerusingstandardflowcontrolonthatport,sothatregardlessofwhich
prioritytrafficbecomescongested,aflowcontrolframeisgenerated.

Lenovo Flex System Fabric CN4093 Specifications

General

Brand	Lenovo
Model	Flex System Fabric CN4093
Category	Switch
Language	English