Reference Guide

Default 0
Format vlan priority priority
Mode Interface Config
Asymmetric Flow Control
Note
Asymmetric Flow Control can only be configured globally for all ports on XGS4 silicon-based
switches.
Note
Asymmetric Flow Control is not supported on Fast Ethernet platforms.
Note
If Asymmetric Flow Control is not supported on the platform, then only symmetric, or no flow
control, modes are configurable.
When in asymmetric flow control mode, the switch responds to PAUSE frames received from a peer by
stopping packet transmission, but the switch does not initiate MAC control PAUSE frames.
When you configure the switch in asymmetric flow control (or no flow control mode), the device is
placed in egress drop mode. Egress drop mode maximizes the throughput of the system at the expense
of packet loss in a heavily congested system, and this mode avoids head-of-line blocking.
flowcontrol {symmetric|asymmetric}
Note
The flowcontrol {symmetric|asymmetric} command is available if the platform supports the
asymmetric flow control feature.
Use this command to enable or disable the symmetric or asymmetric flow control on the switch.
Asymmetric here means that Tx Pause can never be enabled. Only Rx Pause can be enabled.
Default
Flow control is disabled.
Format flowcontrol {symmetric|asymmetric}
Mode Global Config
no flowcontrol {symmetric|asymmetric}
Use the no form of this command to disable symmetric or asymmetric flow control.
Format
no flowcontrol {symmetric|asymmetric}
Mode Global Config
Switching Commands
ExtremeSwitching 200 Series: Command Reference Guide for version 01 .02.04.0007 339