Re: LLQ with Bandwidth MQC

The max-reserve command only relates to what can be configured, and not what
will actually be applied to the LLQ.

From what I understand, the priority bandwidth command comes first in the
calculations when configured. So with this understanding, you can subtract
this configured value from the avail bandwidth and then calculate how much
you have left over for other classes. Have you configured too much?

If you tried to apply this to an interface, I would think that you would
have gotten an error message if there was not enough bandwidth avail.

Can you paste your configs, something tells me I am not understanding what
you wrote ...

Many thanks,

Andrew

On Wed, Nov 25, 2009 at 1:24 PM, S Malik <ccie.09_at_gmail.com> wrote:

> All,
> I have deliberately configured three classes with BW statement under a
> policy-map so that it consume 75% of BW.
>
> Fourth class I configured with priority %25. Now I could configure
> service-policy out on interface by changing "max-reserve bw 76%.
>
> I think, BW 25% command under policy-map means minimum 25% and priority 25%
> means upto 25%.
>
> What I like to confirm is that if I keep max-reserve BW 76% then only 1% of
> BW will be used for LLQ?
>
> On Wed, Nov 25, 2009 at 11:39 AM, ALL From_NJ <all.from.nj_at_gmail.com>wrote:
>
>> If you have configured more bandwidth than what is avail, you will see the
>> error message telling you that you do not have enough. You can use the
>> max-reserv command to alter what is available for your configuration.
>>
>> The link:
>>
>> http://www.cisco.com/en/US/docs/ios/qos/command/reference/qos_m1.html#wp1039174
>>
>> By default you can only configure up to 75% of the bandwidth. Use this
>> command when you want to configure more. In your example, 24% would still
>> be available for class-default, aka ... unnamed traffic that does not match
>> your class-maps.
>>
>> The percent command will be a percentage of the available bandwidth. The
>> above link can also be used for looking up these commands as well.
>>
>> IMO, the percentage commands are very good when you are offering a service
>> to another or when you want to standardize a QoS config.
>>
>> For example, network management traffic will always get at least 5% of the
>> bandwidth or biz traffic will always get 40% of bandwidth etc ...
>>
>> Some service providers might offer different service levels at different
>> prices. An example of these might look like:
>>
>> VoIP always get 25%
>> Net Management always gets 5%
>> Ip Prec 3 might always get 30%
>> IP Prec 4 .... gets 15%
>> etc ...
>>
>> If you are a service provider, you can apply these configs to any link and
>> maintain the same service levels regardless of the actual bandwidth of the
>> link. Voip will still always get 25% whether it is on a T1 or T3 ...
>>
>> Does this make sense? I hope my examples are clear (many times I confuse
>> myself :-))
>>
>> HTH,
>>
>> Andrew Lee Lissitz
>> .
>> On Wed, Nov 25, 2009 at 11:18 AM, S Malik <ccie.09_at_gmail.com> wrote:
>>
>>> ALL,
>>>
>>> if I have three classes of traffic each with 25% of minimum BW and 4th
>>> class
>>> of traffic with priority percent 25 then all I need for the
>>> service-policy
>>> command to go through under interface is "max-reserve bw 76%".
>>>
>>> My question is that in this case only 1% of BW will be allocated to the
>>> traffic which is configured for LLQ?
>>>
>>>
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>>
>>
>> --
>> Andrew Lee Lissitz
>> all.from.nj_at_gmail.com
>>
>
>

-- 
Andrew Lee Lissitz
all.from.nj_at_gmail.com
Blogs and organic groups at http://www.ccie.net