[c-nsp] QoS and Router Originated Traffic

[Anton Kapela]

Kind of out-dated, but useful reading:

http://www.cisco.com/en/US/tech/tk543/tk544/technologies_tech_note09186a0080094612.shtml

-Tk

On Sep 17, 2012, at 5:21 AM, Ivan <cisco-nsp at itpro.co.nz> wrote:

> Hi,
>
> I have a requirement to ensure all traffic across certain links have particular CoS markings.  Applying QoS polices on the links works but doesn't capture router originated traffic - BGP, ARP, IPv6 ND etc.
>
> As a potential solution I have tested using IPv4 and IPv6 PBR to force router traffic via lo0
>
> route-map LP permit 10
> set interface Loopback0
>
> ip local policy route-map LP
> ipv6 local policy route-map LP
>
> and have set a QoS policy on lo0
>
> interface Loopback0
> service-policy input LOOP0-IN
>
> this sets a qos-group which is matched the outgoing non-loopback interface and sets CoS as required.
>
> As far as I can tell it works pretty well but I have a few questions
>
> 1) I don't think this works for ARP.  I tried to match protocol arp using the loopback0 policy but
>
> router(config-if)#service-policy input LOOP0-IN
> 'match protocol arp' is not supported on input service-policy
>
> is there anyway to set the CoS value for ARP traffic from the router, ideally only on some interfaces?
>
> 2) Is this configuration going to kill my router - maybe I am forcing some process switching?
>
> Thanks
>
> Ivan
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