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.
When a no-drop QoS Group is configured you must ensure that packets received on ports that do not have
Note
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
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.