[c-nsp] QoS and Router Originated Traffic

[Tony]

Hi,

We use "ip local policy route-map xyz" to apply a route-map to traffic that is originated locally on the router. The route-map is like any normal one with a match statement (using ACL), then a set statement.


regards,
Tony.



>________________________________
> From: Anton Kapela <tkapela at gmail.com>
>To: Ivan <cisco-nsp at itpro.co.nz> 
>Cc: cisco-nsp <cisco-nsp at puck.nether.net> 
>Sent: Tuesday, 25 September 2012 10:07 PM
>Subject: Re: [c-nsp] QoS and Router Originated Traffic
> 
>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
>