Cisco Nexus 7000 Series Configuration Manual page 134

Ingress Queuing
Commands
class-map type queuing match-any
2q4t-8e-in-q-default
match dscp 0-39,46-63.
class-map type queuing match-any
2q4t-8e-in-q-default
match dscp 40-45
class-map type queuing match-any
2q4t-8e-in-q-default
match dscp 0-39,46-63
Note
Modifying the default queuing policy maps is a disruptive operation that might cause frame drops.
You can assign a bandwidth percentage to each ingress queue. The CoS values (priority group) of each queue
and its bandwidth are relayed to the peer using the DCBXP.
With the Enhanced Transmission Selection (ETS; specifies scheduling of queues based on priority)
implementation, when you define both the drop and no-drop classes in a non-8e network qos policy template,
the queuing follows a hierarchical pattern. In a hierarchical queuing pattern, queues within a class are configured
with respect to the buffer at the first level, and buffers across the queuing groups are configured at the second
level.
You use the queue-limit command to tune the ingress queue sizes (buffers). You can define the percentage
of the total buffer to be allocated to the queue. For more information about the queue-limit command, see the
Cisco Nexus 7000 Series NX-OS Quality of Service Command Reference.
You use the bandwidth command to control the bandwidth allocated to the traffic classes (CoS) in the ingress
queue. The bandwidth allocated to a traffic class in the ingress queue does not impact the switch. Instead, it
sends the bandwidth information to the peer as an indication of the bandwidth for the traffic classes (CoS)
that the peer sends. For more information about the bandwidth command, see the Cisco Nexus 7000 Series
NX-OS Quality of Service Command Reference.
You use the set cos command only on the default queue to make a port that is untrusted on the default queue.
Starting with Cisco NXOS 6.2(2) Release, default dscp values are provided for all the following five templates
on F-Series Modules:
• default-nq-4e-policy template 4e
• default-nq-6e-policy template 6e
Cisco Nexus 7000 Series NX-OS Quality of Service Configuration Guide
118
Configuring Queuing and Scheduling on F-Series I/O Modules
Description
The remaining DSCP values (0-39, 46-63) are
automatically mapped to the default queue.
The values associated with the default queue are not
displayed by the show run command. These values
are implicitly programmed in the hardware.
When specific DSCP values are mapped to the default
queue (2q4t-8e-in-q-default), the remaining DSCP
values are automatically mapped to the default queue.
There is no restriction when specifying all of the
remaining DSCP values in the default queue.
The values set by the match dscp command are
displayed by the show run command.
The DSCP values (0-39, 46-63) are automatically
mapped to the default queue (2q4t-8e-in-q-default).
The values associated with the default queue are not
displayed by the show run command. These values
are implicitly programmed in the hardware.