Brocade Communications Systems Brocade Network OS 2.1 - Manual (Page 23)

Network OS Documentation Update 13
53-1002606-06
qos flowcontrol
2
qos flowcontrol
Activates and configures QoS flow control.
Synopsis qos flowcontrol tx [on | off] rx [on | off]
no qos flowcontrol
Operands tx [on | off] Activates or deactivates the transmission portion of flow control.
rx [on | off] Activates the receiving portion of flow control.
Defaults None
Command
Modes
Interface configuration mode
Description This command configures and activates QoS flow control.
When a 1Gbps local port is already online, and the qos flowcontrol command is issued, the pause
settings take effect immediately on that local port. However, when the link is toggled, pause is
re-negotiated. The local port will advertise the most recent qos flowcontrol settings. After auto
completes, the local port pause settings may change, depending on the outcome of the pause
negotiation, per 802.3 Clause 28B, as shown in
Table 1 .
Usage
Guidelines
None
Examples None
See Also None
TABLE 1 Pause negotiation results
Advertised LOCAL cfg Advertised REMOTE cfg Negotiated result
Rx=off Tx=on Rx=on Tx=on asymmetrical: LOCAL Tx=on --> pause --> REMOTE Rx=on
Rx=on Tx=on Rx=off Tx=on asymmetrical: LOCAL Rx=on <-- pause <-- REMOTE Tx=on
Rx=on Tx=n/a Rx=on Tx=n/a symmetrical : LOCAL Tx/Rx=on <-- pause --> REMOTE Tx/Rx=on
Rx=n/a Tx=n/a Rx=off Tx=off disable pause both sides