Configuring Tail Drop By Cos Values - Cisco Nexus 7000 Series Configuration Manual

Configuring Queuing and Scheduling on M-Series I/O Modules

Configuring Tail Drop by COS Values

You can configure tail drop on both ingress and egress queues by setting thresholds by CoS values. The device
drops packets that exceed the thresholds. You can specify a threshold based on the queue size or buffer memory
that is used by the queue.
Note You cannot configure the queue size on ingress 10-Gigabit Ethernet ports except for the 8-port, 10-Gigabit
Ethernet I/O module.
You use the system-defined queue classes for the type of module to which you want to apply the policy map.
See Table 6: System-Defined Type queuing Class Maps, on page
Note
WRED and tail drop cannot be configured in the same class.
Procedure
Step 1
Step 2
Step 3
Step 4
Command or Action
switch# configure terminal
switch(config)# policy-map type queuing
[match-first] {policy-map-name |
que-dynamic}
switch(config)# class type queuing
class-queuing-name
switch(config-pmap-c-que)# queue-limit cos
value {threshold [packets | bytes | kbytes |
mbytes | ms | us] | percent
percent_of_queuelimit}
Cisco Nexus 7000 Series NX-OS Quality of Service Configuration Guide
Configuring Tail Drop by COS Values
15.
Purpose
Enters global configuration mode.
Configures the policy map of type queuing, and
then enters policy-map mode for the policy-map
name that you specify. Policy-map names can
contain alphabetic, hyphen, or underscore
characters, are case sensitive, and can be up to
40 characters.
Configures the class map of type queuing, and
then enters policy-map class queuing mode.
Assigns a tail drop threshold based on the queue
size or percentage of the buffer memory that is
used by the queue. The device drops packets
that exceed the specified threshold. You can
configure the threshold by the number of
packets, number of bytes, or the duration of
time at the underlying interface minimum
guaranteed link rate. The default threshold is in
packets. The size is from 1 to 83886080. The
duration is from 1 to 83886080. The percentage
is from 1 to 100.
Note Repeat Step 4 to assign tail drop
thresholds for other CoS values.
Repeat Steps 3 through 5 to assign
tail drop thresholds for other queue
classes.
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