Cisco N5K-M1600 - Expansion Module - 6 Ports Troubleshooting Manual page 64

Improper Configurations
S e n d d o c u m e n t c o m m e n t s t o n e x u s 5 k - d o c f e e d b a c k @ c i s c o . c o m .
xon
------+---------+-----------
21760
Queueing:
queue qos-group cos
-----+----------+------------+-----------+--------------+------
2
4
5
6
7
Queue limit: 64000 bytes
Queue Statistics:
queue
------+-------------+---------------
2
4
5
6
7
Port Statistics:
rx drop
------------+-----------------+---------------+---------------
0
Priority-flow-control enabled: no
Flow-control status:
cos
-------+-----------+---------+---------+---------------
0
1
2
3
4
5
6
7
switch#
The Nexus 2148 has two queues in both the ingress and egress directions. One queue is mapped to the
no-drop system class and another queue is mapped to the drop system class. For the ingress direction,
the two queues are scheduled using WRR (Weight Round Robin). For the egress direction, the queue for
the no-drop system class is the priority queue.
In order to separate traffic for the two queues, the user has to create a no-drop system class. All no-drop
system classes created on the Nexus 5000 are mapped to the no-drop queue on the Nexus 2148.
The pause no-drop command is added to the Network-QoS in order for the Nexus 2148 to place voice
in the priority queue at the FEX egress direction.
Example:
policy-map type network-qos NetworkQoS-5020
class type network-qos Voice
set cos 5
pause no-drop
class type network-qos Video-Signalling
set cos 4
mtu 9216
class type network-qos Scavenger
set cos 1
mtu 9216
class type network-qos Critical
Cisco Nexus 5000 Series Troubleshooting Guide
4-6
xoff buffer-size
26880 48640
0 0 2 3
2 1
3 6
4 4
5 5
rx tx
113822539041 1
0 0
0 0
417659797 0
0 0
rx mcast drop
0
qos-group rx pause
0 xon
2 xon
0 xon
0 xon
4 xon
5 xon
3 xon
n/a xon
priority bandwidth mtu
WRR 73
WRR 1
WRR 6
WRR 20
PRI 0
rx error tx drop
0 0
tx pause masked rx pause
xon xon
xon xon
xon xon
xon xon
xon xon
xon xon
xon xon
xon xon
Chapter 4 Troubleshooting QoS Issues
9280
9280
9280
9280
1600
OL-25300-01