Applying qos on subinterfaces

[carl_townshend]

Hi all

just a quick question, we have a sub interface configured to my isp on my isr4k

The QOS Service policy is on the physical interface, I’m assuming this will work all ok? Or do I need to put it on the sub interface?

cheers

[balaji.bandi]

yes it should be ok below guide help you : ( you need to configure on sub-interface since it tagged with dot1q)

https://www.cisco.com/c/en/us/support/docs/quality-of-service-qos/qos-policing/10104-qos-subint.html

[Georg Pauwen]

Hello,

typically, QoS on subinterfaces requires a Parent - Child policy. Below an example of a very simple 100MB traffic shaper applied to a subinterface:

policy-map CHILD
class class-default
fair-queue
!
policy-map PARENT
class class-default
shape average 100000000
service-policy CHILD
!
interface GigabitEthernet0/1.10
description Subinterface to ISP
service-policy output PARENT

[carl_townshend]

Do you have to apply it to the sub interface ? Would it not work if attached to the physical interface then ? If so how come ?

[balaji.bandi]

As mentioned subinterface are tagged with VLAN so the QOS applies based on that config ? is this make sense?

[Joseph W. Doherty]

"Ok" depends on whether you need the policy to apply to all the traffic on the interface or if you have QoS requirements per sub interface.