symmetrical-flow-control enable
SFC is globally disabled.
Global configuration mode
The
no form of this restores the default flow-control settings.
Configuring the symmetrical-flow-control
enable command enables SFC globally for priorities from 0 through 4 by
default and optionally for all priorities from 0 through 7. Using
symmetrical-flow-control enable command is recommended as
this turns on SFC for priorities from 0 through 4 and does not impact other high
priority queues.
By default, the system runs in tail-drop mode,
with all ports honoring 802.3x flow control and disabling 802.3x transmit. The
symmetrical-flow-control enable command enables transmission of 802.3x
pause frames.
Configuring the
symmetrical-flow-control enable command changes priority-to-PG mapping.
You cannot configure the
symmetrical-flow-control enable command if the
priority-flow-control command is enabled.
If the
symmetrical-flow-control enable command is not enabled, you cannot configure the
flow-control generate-only or the
flow-control both commands in interface configuration mode.
The following example enables SFC.
device# configure terminal device(config)# symmetrical-flow-control enable
The following example enables all priorities to send the IEEE 802.3x pause.
device# configure terminal device(config)# symmetrical-flow-control enable all-priorities
The following example enables SFC for generate-only mode.
device(config)# symmetrical-flow-control enable device(config)# flow-control generate-only
| Release version | Command history |
|---|---|
| 08.0.10 | This command was introduced. |