My environment: Nexus 7010, NX-OS 4.2
Just got a chance to play with the Nexus 7000 NX-OS QoS, the “mls qos” syntax has gone and now all the commands are based on MQC.
In the following example, I’m going to configure 2 ingress ports, one with high priority traffic and one with normal traffic, and at egress port high priority traffic will be assigned to PQ to dequeue first.
Classification
N7K# conf t
class-map type queuing match-any 1p3q4t-out-pq1
match cos 5
It can only be done via the main VDC. It can’t be done on child VDC. And you can ONLY match cos in the class-map.
Marking
Now let’s mark the ingress traffic, I will do this at the port assigned to the vdc “test”.
N7K# switchto vdc test
N7K-test#
policy-map type queuing highpriority-in-policy
class type queuing 2q4t-in-q-default
set cos 5
Scheduling and Queuing
Finally, I want to assign the high priority traffic (cos=5) to PQ
N7K-test#
policy-map type queuing highpriority-out-policy
class type queuing 1p3q4t-out-pq1
priority level 1
Last step is to assign service policy to the interface:
N7K-test#
int e3/1
description - High Priority – Ingress -
service-policy type queuing input highpriority-in-policy
!
int e3/2
description – Low Priority – Ingress -
!
int e3/3
description – Egress Port -
service-policy type queuing output highpriority-out-policy
!
Example Configuration
R11(config)#class-map voip-class
R11(config-cmap)#match ip dscp ef
R11(config-cmap)#policy-map voip-map
R11(config-pmap)#class voip-class
R11(config-pmap-c)#priority percent 33
R11(config-pmap-c)#int fa0/0
R11(config-if)#service-policy output voip-map
Double LLQ – 2 policing in 1 queue
Example:
1 Video Conference session = 320kbps
3 G.729a voice calls = 80kbps
If you configure “priority 400”, and if you have more than 3 G.729a voice calls, it will affect the video conferencing quality as it will exceed the policed rate 400kbps.
If you have 2 separate class-maps, i.e.
R11(config-pmap)#policy-map 2llq-map
R11(config-pmap)#class voice-class
R11(config-pmap-c)#priority 80
R11(config-pmap)#class video-class
R11(config-pmap-c)#priority 320
You can’t have more than 1 video conference call or more than 3 G.729a calls as it is policed in 2 difference classes.
