[c-nsp] VoIP QoS Policy

[Brian Feeny]

Raj,

Yes of course, and I am aware of that, but that is a good thing.  If  
the LLQ did not have a limit
it could be very bad.  In the actual IOS I am deploying 12.2(18)S7,  
priority percent is not actually
an option, so I am just using priority, and giving a kBps limit.  But  
its liberal enough to allow for
even peak times of VoIP traffic.

On Feb 20, 2005, at 12:44 AM, r.sahney wrote:

> Hi Brian,
>
>            In this case u might face into a little problem , priority
> percent is strict queuing, hence if by any chance the traffic will be
> more it will be dropped,
> it is true that priority has LLQ, Manages Jitter, Improves App.
> perfomance, but at the same time drops extra traffic as well,so it
> would be wise if u r sure that your voip rtcp will never exceecd 20 %
> of the total bandwidth link.
>
> regards
> raj.
>
>
> On Thu, 17 Feb 2005 10:09:16 -0600, Brian Feeny <signal at shreve.net>  
> wrote:
>>
>> fyi, I meant for the output policy to have "priority percent" not
>> "bandwidth percent" that was a typo.
>>
>> Brian
>>
>>
>> On Feb 17, 2005, at 9:19 AM, Brian Feeny wrote:
>>
>>>
>>> I am making a basic QoS policy to install on some of our routers  
>>> here,
>>> to give some QoS to VoIP.
>>> Eventually I will come up with a more thorough QoS plan but for now  
>>> it
>>> just needs to take care of
>>> VoIP.  The VoIP is using SIP not skinny.  Any comments on the below
>>> policy, or anything I may be
>>> leaving out?  My goal is to identify VoIP traffic, mark the voice as
>>> EF, and the control stuff as AF31,
>>> then look at anything else that was marked (by endusers) as  
>>> EF/CS3/AF31
>>> and remark it to 0.
>>>
>>> Also, does using the NBAR stuff such as "match protocol rtp audio"
>>> accomplish the same thing
>>> as "match ip rtp 16384 16383"?
>>>
>>> Brian
>>>
>>>
>>> class-map match-all QoS-VoIP-Control
>>>    match access-group name SIP-Control
>>> class-map match-all QoS-VoIP-RTCP
>>>    match ip rtp 16384 16383
>>> class-map match-any QoS-VoIP-Remark
>>>    match ip dscp ef
>>>    match ip dscp cs3
>>>    match ip dscp af31
>>> !
>>> ip access-list extended SIP-Control
>>>   permit udp any any eq 5060
>>> !
>>> !!! Input Policy
>>> !
>>> policy-map Mark-DSCP
>>>    class QoS-VoIP-RTCP
>>>     set ip dscp ef
>>>    class QoS-VoIP-Control
>>>     set ip dscp af31
>>>    class QoS-VoIP-Remark
>>>     set ip dscp default
>>> !
>>> !!! Output Policy
>>> !
>>> policy-map QoS-Policy
>>>    class QoS-VoIP-RTCP
>>>      bandwidth percent 20
>>>    class QoS-VoIP-Control
>>>     bandwidth percent 5
>>>    class class-default
>>>     fair-queue
>>>       set ip dscp default
>>>
>>>
>>>
>>>
>>> ---------------------------------------------
>>> Brian Feeny, CCIE #8036, CISSP
>>> Network Engineer
>>> ShreveNet Inc.
>>>
>>> _______________________________________________
>>> cisco-nsp mailing list  cisco-nsp at puck.nether.net
>>> https://puck.nether.net/mailman/listinfo/cisco-nsp
>>> archive at http://puck.nether.net/pipermail/cisco-nsp/
>>>
>> ---------------------------------------------------------------------- 
>> --
>> ------
>> Brian Feeny, CCIE #8036, CISSP          e: signal at shreve.net
>> Network Engineer                                p: 318.213.4709
>> ShreveNet Inc.                                  f: 318.221.6612
>>
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