About Disabling Flow Control on the S/N/K-Series

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Article ID: 13285 

Products
S-Series
Matrix N-Series DFE
K-Series 

Discussion
On these products as long as Flow Control is advertised it will continue to function - even when disabled. 
Though this behavior is considered to be Functions as Designed (FAD), it is still counter-intuitive. 

To disable Flow Control on a port:
set port flowcontrol <port#> both disable
clear port advertise <port#> bpause

To re-enable Flow Control on a port:
set port flowcontrol <port#> both enable
set port advertise <port#> bpause

To review the result, in either case:
show port flowcontrol <port#>
show port advertise <port#>

Note that Flow Control - which uses IEEE 802.1x Pause frames - only applies to ports operating in Full Duplex mode. Half Duplex ports, on the other hand, use a transmitted collision signal to elicit a flow control effect on peer devices. 

See also: 6835 and 15084.
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Posted 5 years ago

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