08-27-2009 03:20 AM - edited 03-04-2019 05:52 AM
Hi Experts,
I request you to share the concept Why
"Cisco IOS logical interfaces (Tunnel Interface) do not inherently support a state of congestion and do not support the direct application of a service policy that applies a queuing method"
I know that a child policy-map X has to be created and and must be applied as a service policy in another policy-map Y
I tried and not able to get why it is not supported.
Thanks in advance
RBK
08-27-2009 03:32 AM
As the tunnel interfaces are virtual - normal QoS will not work.
You need to look at Shaping & Policing for tunnel QoS.
HTH>
08-27-2009 04:07 AM
Hi,
Thanks for your reply. I am aware that it is virtual interface and do not support QoS natively.
My doubt is why the child policy-map is been insisted to be used to make QoS work?
Thanks
sairam
08-27-2009 04:59 AM
The child policy isn't needed unless you intend to support a CBWFQ policy. Then, since CBWFQ needs to "know" bandwidth, it uses a shaper, in a parent policy, to "define" the bandwidth, which the child policy then uses. (BTW, would need to double check, but the CBWFQ [HQF] starting with 12.4.20T, I recall, has some improved/changed support for tunnel QoS.)
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