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

Interface configuration mode

Modes

 

 

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.

 

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

 

 

 

 

 

 

Usage

None

 

 

 

Guidelines

 

 

 

 

Examples

None

 

 

 

See Also

None

 

 

 

Network OS Documentation Update

13

53-1002606-06

 

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Image 23
Brocade Communications Systems 2.1 manual Qos flowcontrol, Rx on off

2.1 specifications

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