Configuring Link Level Flow Control Transmit - Cisco Nexus 9000 Series Configuration Manual

Configuring Link Level Flow Control Transmit

Command or Action
Step 2 interface ethernet 1/1
Example:
Device(config)# interface ethernet 1/1
Step 3
flowcontrol receive on
Example:
Device(config-if)# flowcontrol receive on
Step 4 exit
Example:
Device(config-if)# exit
Configuring Link Level Flow Control Transmit
To configure link-level flow control transmit on an interface, you enable flow control on the interface, configure
a network-qos type QoS policy to enable a no-drop QoS group, and apply a qos type QoS policy to classify
the traffic that requires no-drop behavior to the no-drop class.
You must ensure that bandwidth is allocated for the No-Drop QoS class using a queuing policy when you
define a no-drop class. For more information, see the "Configuring Type Queuing Policies" section.
Note
When a no-drop QoS Group is configured you must ensure that packets received on ports that do not have
flow-control send-on configured, are not classified to a no-drop QoS group. This is required as any ingress
port that does not have flow-control send-on configured, can not generate a link level pause frame and there
is no way to request the transmitting device to stop the transmission. Therefore, if flow-control send-on is not
configured on all the interfaces you should not use a system policy to classify the packets to the no-drop QoS
group. Instead, you should apply an interface QoS policy to the interfaces that having flow-control send-on
enabled.
SUMMARY STEPS
1. configure terminal
2. interface ethernet 1/1
3. flowcontrol send on
4. exit
DETAILED STEPS
Command or Action
Step 1 configure terminal
Example:
Cisco Nexus 9000 Series NX-OS Quality of Service Configuration Guide, Release 7.x
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Configuring Link Level Flow Control
Purpose
Configures an interface type and enters interface
configuration mode.
Enables the interface to receive and process pause frames.
Exits interface configuration mode.
Purpose
Enters global configuration mode.