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Configuring QoS on the System
Verifying the Jumbo MTU
On the Cisco Nexus device, traffic is classified into one of eight QoS groups. The MTU is configured at the
QoS group level. By default, all Ethernet traffic is in QoS group 0. To verify the jumbo MTU for Ethernet
traffic, use the show queueing interface ethernet slot/chassis_number command and find "HW MTU" in
the command output to check the MTU for QoS group 0. The value should be 9216.
The show interface command always displays 1500 as the MTU. Because the Cisco Nexus device supports
different MTUs for different QoS groups, it is not possible to represent the MTU as one value on a per interface
level.
For Layer 3 routing on the Cisco Nexus device, you must verify the MTU on the Layer 3 interfaces (SVIs
Note
and physical interfaces with IP addresses) in addition to the global QoS MTU. You can verify the Layer
3 MTU by using the show interface vlan vlan_number or show interface slot/chassis_number.
This example shows how to display jumbo MTU information for Ethernet 1/19:
switch# show queuing interface ethernet1/19
Ethernet1/19 queuing information:
TX Queuing
RX Queuing
Total Multicast crossbar statistics:
Verifying the System QoS Configuration
Use one of the following commands to verify the configuration:
OL-26657-01
qos-group
sched-type
oper-bandwidth
0
WRR
1
WRR
qos-group 0
q-size: 243200, HW MTU: 9280 (9216 configured)
drop-type: drop, xon: 0, xoff: 1520
Statistics:
Pkts received over the port
Ucast pkts sent to the cross-bar
Mcast pkts sent to the cross-bar
Ucast pkts received from the cross-bar
Pkts sent to the port
Pkts discarded on ingress
Per-priority-pause status
qos-group 1
q-size: 76800, HW MTU: 2240 (2158 configured)
drop-type: no-drop, xon: 128, xoff: 240
Statistics:
Pkts received over the port
Ucast pkts sent to the cross-bar
Mcast pkts sent to the cross-bar
Ucast pkts received from the cross-bar
Pkts sent to the port
Pkts discarded on ingress
Per-priority-pause status
Mcast pkts received from the cross-bar
Cisco Nexus 5000 NX-OS Quality of Service Configuration Guide, Release 5.1(3)N2(1)
50
50
: 2119963420
: 2115648336
: 4315084
: 2592447431
: 2672878113
: 0
: Rx (Inactive), Tx (Inactive)
: 0
: 0
: 0
: 0
: 0
: 0
: Rx (Inactive), Tx (Inactive)
: 80430744
Verifying the Jumbo MTU
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