QoS for Tunnel source loopback

[Anton Pestov]

Where to apply policy-map when GRE Tunnel Interface have "tunnel source Loopback" ?

- to Physical interface (corresponds to a routing table for GRE IP header DestIP)?

or

- to Loopback interface?

Example. Where to apply policy-qos-test-parent:

policy-map policy-qos-test
 class class-qos-test-dscp
  priority percent 10
 class class-default
  fair-queue
  random-detect dscp-based
  random-detect ecn

!
policy-map policy-qos-test-parent
 class class-default
  shape average percent 85
   service-policy policy-qos-test

!

interface GigbitEthernet 0/1

 ip add 10.10.10.1 255.255.255.252

!

interface Loopback 0

 ip add ...

!

interface Tunnel999

 bandwidth 10240

 ip add ....

 tunnel source Loopback0

 tunnel destination 10.10.10.2

!

[Joseph W. Doherty · Accepted solution]

On the tunnel interface or the physical egress interface; not on the loopback interface.

BTW, as you're using FQ, FQ won't "see" flows if you apply the policy on the physical egress interface unless you also use the qos pre-classify command on the tunnel interface.

[Anton Pestov]

If to apply policy on the Physical interface, then also it is necessary to specify actual 'bandwidth ...' parameter, that parent policy shaper correctly worked?

[Joseph W. Doherty]

Depends on whether you're using CBWFQ/shaper that supports using percentages, and have configured bandwidth as percentages.