4-90 Sun Fire B1600 Blade System Chassis Switch Administration Guide •June 2003
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
■Flow control can eliminate frame loss by “blocking” traffic fromend stations or
segments connected directly to the switch when its buffers fill. When enabled,
back pressure is used for half-duplex operation and IEEE 802.3x for full-duplex
operation.
■To forceflow control on or off (with the flowcontrol or no flowcontrol
command), use the no negotiation command to disable auto-negotiation on
the selected interface.
■When using the negotiation command to enable auto-negotiation, the
optimal settings will be determined by the capabilities command. To
enable flow control under auto-negotiation, flowcontrol must be included in
the capabilities list for any port.
■Avoid using flowcontrol on a port connected to a hub unless it is actually
required to solve a problem. Otherwise back pressure jamming signals may
degrade overall performance for the segment attached to the hub.
Example
The following example enables flow control on port NETP7.
Related Commands
negotiation (4-86)
capabilities (flowcontrol, symmetric) (4-87)
Console(config)#interface ethernet NETP7
Console(config-if)#flowcontrol
Console(config-if)#no negotiation
Console(config-if)#