Configuring the Queue Limit at the Global Level
The following are guidelines for the configuration of the queue limit:
•
The tx queue limit specifies the buffer size used for each queue in the egress (n2h) direction.
•
The rx queue limit specifies the buffer size used for each port in the ingress (h2n) direction.
•
You can adjust the ingress queue limit when the FEX uplink experiences temporary congestion.
•
You can adjust the egress queue limit for improved burst absorption or in a situation where there is a
many to one traffic pattern.
•
When you disable the tx queue limit, any output port is able to use the entire shared buffer.
Procedure
Purpose
Command or Action
Enters global configuration mode.
configure terminal
Example:
switch# configure terminal
switch(config)#
Step 1
Enters configuration mode for the specified FEX.
fex chassis_id
Step 2
Example:
switch(config)# fex 100
switch(config)#
The range of the
chassis_id
value is 100 to 199.
Controls the egress (tx) or ingress (rx) queue tail drop
threshold level on a FEX.
hardware N2248TP-E queue-limit
queue-limit tx|rx
Step 3
Example:
switch(config-fex)# hardware
N2248TP-E queue-limit 83000 tx
•
The default queue limit for tx (egress) is 4 MB.
The
hardware N2248TP-E queue-limit
command specifies the default tx queue
limit.
Note
•
The default queue-limit for rx (ingress) is 1 MB.
The
hardware N2248TP-E queue-limit
rx
command specifies the default rx queue
limit.
Note
This example shows how to configure the queue limit.
switch#
configure terminal
switch(config)#
fex 100
switch(config-fex)#
hardware N2248TP-E queue-limit 83000 tx
switch(config-fex)#
Cisco Nexus 6000 Series NX-OS Layer 2 Switching Configuration Guide, Release 7.x
179
Configuring the Fabric Extender
Configuring the Queue Limit at the Global Level
