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Configuring Link-Level Flow Control
Configuring Link-Level Flow Control
By default, LLC on Ethernet interfaces is disabled. You can enable LLC for the transmit and receive directions.
Procedure
Step 1
Step 2
Step 3
Step 4
This example shows how to enable LLC on an interface:
switch# configure terminal
switch(config)# interface ethernet 1/2
switch(config-if)# flowcontrol receive on transmit on
Disabling Slow Port Pruning on Multicast Traffic on the Cisco Nexus 5500
Series Device
You can disable slow port pruning on multicast packets.
An interface on the Cisco Nexus 5500 Series device can become congested when it receives excessive multicast
traffic or when the mixed unicast and multicast traffic rate exceeds the port bandwidth. When multiple interfaces
receive the same multicast flow and one or more ports experience congestion, the slow port prunning feature
allows the switch to drop only the multicast packets for the congested port. This feature is turned on by default.
To turn the slow port pruning feature off, enter the hardware multicast disable-slow-port-pruning command.
Procedure
Step 1
Step 2
Step 3
Cisco Nexus 5000 NX-OS Quality of Service Configuration Guide, Release 5.1(3)N2(1)
66
Command or Action
switch# configure terminal
switch(config)# interface type slot/port
switch(config-if)# flowcontrol [receive {on |
off}] [transmit {on | off}]
switch(config-if)# no flowcontrol [receive {on
| off}] [transmit {on | off}]
Command or Action
switch# configure terminal
switch(config)# hardware multicast
disable-slow-port-pruning
switch(config)# no hardware multicast
disable-slow-port-pruning
Configuring Queuing and Flow Control
Purpose
Enters global configuration mode.
Specifies the interface to be changed.
Enables LLC for the selected interface. Set
receive and/or transmit on or off.
(Optional)
Disables LLC for the selected interface.
Purpose
Enters configuration mode.
Disables slow port pruning on multicast
packets. The default is enabled.
Enables the slow port pruning feature.
OL-26657-01
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