flow-control
Enables or disables flow control and flow control negotiation, and advertises flow control.
Syntax
Command Default
Flow control is enabled.
Parameters
Modes
Global configuration mode
Interface configuration mode
Usage Guidelines
The no form of this command disables flow control.
On ICX 7750 devices the default packet-forwarding method is cut-through, in which port flow control (IEEE 802.3x) is not supported but priority-based flow control (PFC) is supported. You can configure the store-and- forward command in global configuration mode to enable the store-and-forward method for packet-forwarding.
The recommended flow control settings when the ICX 7750 switch is set for store-and-forward, are listed below.
Symmetrical flow control | Port-based flow control | Configuration commands | Cut-through (Jumbo enabled) | Store-and-Forward (Jumbo Enabled) |
---|---|---|---|---|
disabled | honor-only | # flow-control honor-only | Not Recommended | OK |
no flow-control-both | #no flow-control both | OK | OK | |
enabled | no flow-control-both |
#symmetrical-flow-control enable # no flow-control both |
OK | OK |
honor-only |
# symmetrical-flow-control enable #flow-control honor-only |
Not Recommended | OK | |
generate-only |
# symmetrical-flow-control enable # flow-control generate-only |
OK | OK | |
both |
# symmetrical-flow-control enable #flow-control both |
Not Recommended | OK |
By default, when flow control is enabled globally and auto-negotiation is on, flow control is enabled and advertised on 10/100/1000M ports. If auto-negotiation is off or if the port speed was configured manually, flow control is neither negotiated with nor advertised to the peer.
Examples
The following example disables flow control globally.
device(config)#no flow-control
The following example enables flow control on ethernet ports 0/1/11 to 0/1/15.
device(config)#interface ethernet 0/1/11 to 0/1/15 device(config-mif-0/1/11-0/1/15)#flow-control
The following example disables flow control on ethernet port 1/1/9.
device(config)# interface ethernet 1/1/9 device(config-if-e1000-1/1/9)no flow-control
History
Release version | Command history |
---|---|
8.0.20 | This command was modified. Enabling only auto-negotiation does not enable flow-control negotiation. |