Extreme Networks ExtremeWare 7.5, Command Reference Manual

Page: 2255 / 2546

enable flow-control ports
ExtremeWare 7.5 Command Reference Guide 2255
enable flow-control ports
enable flow-control ports [<portlist> | all]
Description
Enables 802.3x flow control on “3” series ports.
Syntax Description
Default
Disabled
Usage Guidelines
Since
“3”
series modules are oversubscribed to the module switch fabric, traffic can congest. Flow control
allows you to stop incoming traffic when too much congestion occurs.
Flow control sends a PAUSE frame to the transmitter when traffic approaches the congestion threshold
for a specific queue. The PAUSE frame is sent
before the queue overflows, so throughput is slightly
reduced when flow control is enabled. Flow control is auto-negotiated and is disabled if both ports do
not support it.
If you enable flow control, use the following keywords:
•
portlist
to specify an individual port or a group of ports
•
all
to specify all
“3”
series ports
Example
The following command enables flow control on slot 2, ports 1 through 4:
enable flow-control ports 2:1-2:4
History
This command was first available in ExtremeWare 7.0.1.
Platform Availability
This command is available on “3” series I/O modules only.
portlist Specifies one or more slots and ports. May be in the form 2:*, 2:5, 2:6-2:8.
all Specifies all
“3”
series ports.