From: mahmoud genidy (ccie.mahmoud@gmail.com)
Date: Sat Dec 06 2008 - 02:13:29 ARST
- The bandwidth reservation using percent in MQC is absolute with IOS 12.4
- By default bandwidth reservation is up to %75 percent. The other %25 is to
support best-effort and control traffic, and Layer 2 overhead.
Based on that information it is now clear that:
- If we need to reserve more than %75 of the interface bandwidth for
different traffic classes then we have to use [ maximum-reservation
bandwidth ] command to change the percentage.
- For default class if left as it is then it will be best effort. And it
will share bandwidth remaining from other classes with the layer-2 overhead
and control traffic.
So the answer for the question sent is:
First we have to use: maximum-reserved bandwidth 100
Second under class default we have to use: bandwidth percent 10
This is my understanding so far. Please correct me if you think I'm wrong.
Thanks,
Mahmoud.
On Fri, Dec 5, 2008 at 2:23 PM, mahmoud genidy <ccie.mahmoud@gmail.com>wrote:
>
> I agree with you if you will go with (map-class and traffic shaping) option
> you will have to statically define CIR and MINCIR as well.
>
> But the point is based on what the question says I think we don't have to
> configure shaping or map-class. We can directly assign the service policy to
> the interface.
>
>
>
> On Fri, Dec 5, 2008 at 1:20 PM, Nick Matthews <matthn@gmail.com> wrote:
>
>> From what I understand of frame QoS in this situation -
>>
>> If you're using a map-class with a service policy (but not using
>> interface-level frame-relay traffic shaping) you will need to assign the
>> bandwidth level via cir/mincir or a hierarchical shaping policy. I noticed
>> that doing 'show policy-map interface' will not show anything until one of
>> these is configured.
>>
>> Feel free to correct if this isn't right.
>>
>>
>> -Nick
>>
>>
>> On Thu, Dec 4, 2008 at 7:52 PM, Pavel Bykov <slidersv@gmail.com> wrote:
>>
>>> Regarding #4: bandwidth is not reserved by default for class-default and
>>> it
>>> can easily starve. To really alocate bandwidth to class-default so it has
>>> minimum guarantee you'd need to use "bandwidth" command.
>>>
>>> On Fri, Dec 5, 2008 at 1:44 AM, mahmoud genidy <ccie.mahmoud@gmail.com
>>> >wrote:
>>>
>>> >
>>> > 1- For [ Critical voice ] wording. Is it a proctor question to ask if
>>> he it
>>> > requires matching precedence 5 in the ACL used to match the voice
>>> traffic?
>>> >
>>> > 2- Again is it a proctor question if I like to confirm if [ maximum
>>> > reserved bandwidth 100 ] is required or not?
>>> >
>>> > 4- Regarding the class-default as the question says remaining bandwidth
>>> > will go for the default class. This is the default behavior any way so
>>> I
>>> > think no extra configuration is required for it.
>>> >
>>> >
>>> >
>>> > On Fri, Dec 5, 2008 at 3:33 AM, Pavel Bykov <slidersv@gmail.com>
>>> wrote:
>>> >
>>> >> Here is my take:
>>> >> 1. I'd match udp port ranges AND precedence 5 to be sure. Maybe even
>>> mark
>>> >> it as critical on input, depending on context of other QoS tasks.
>>> >> 2. It does not imply that, but it does seem logical in this example,
>>> since
>>> >> he asks you to allocate "remaining bandwidth" to default, which would
>>> be the
>>> >> rest of the interface bandwidth
>>> >> 3. Interface
>>> >> 4. It is NOT POSSIBLE to configure fair-queue if you put bandwidth
>>> >> reservation. In this case, you are asked to reserve the res to class
>>> >> default, so you would go:
>>> >> class class-default
>>> >> bandwidth percent 10
>>> >>
>>> >> So you will not be able to put fair queue in there.
>>> >>
>>> >>
>>> >> On Thu, Dec 4, 2008 at 3:16 PM, mahmoud genidy <
>>> ccie.mahmoud@gmail.com>wrote:
>>> >>
>>> >>> Hi
>>> >>>
>>> >>> I have a QoS scenario over FR link and I'm not sure which way should
>>> I
>>> >>> go.
>>> >>>
>>> >>> The case is as follows.
>>> >>>
>>> >>> A Router *R1* with S0/0 configured with FR with two PVC on main
>>> interface
>>> >>> (HUB). It is connected with two other routers R2 & R3 over FR as
>>> spokes.
>>> >>>
>>> >>> The question says: On *R1* Allocate bandwidth as follows:
>>> >>>
>>> >>> - % 25 of S0/0 bandwidth for network 10.1.1.0/24
>>> >>> - % 35 of S0/0 bandwidth for network 10.1.2.0/24
>>> >>> - % 30 of S0/0 bandwidth for CRITICAL voice traffic
>>> >>> - Remaining bandwidth is for Class-Default
>>> >>>
>>> >>> My questions are:
>>> >>>
>>> >>> - When he says *CRITICAL* voice does this mean in the extended ACL to
>>> use
>>> >>> precedence 5, or it is not necessary as Voice by default is critical
>>> >>> traffic?
>>> >>>
>>> >>> - When he says for example %25 *OF S0/0* does this implies we have to
>>> >>> configure [ maximum-reserved-bandwidth 100 ] ?
>>> >>>
>>> >>> - The interface in question is FR with two PVCs. Does this mean we
>>> have
>>> >>> to
>>> >>> apply the service policy through a FR MAP-CLASS with CIR equals S0?)
>>> >>> bandwidth? Or we can directly apply the service policy on the serial
>>> >>> interface?
>>> >>>
>>> >>> - Is it preffered to configure fair-queue for class-default in this
>>> case,
>>> >>> or
>>> >>> just leave it as it is?
>>> >>>
>>> >>> Thanks in advance for your time.
>>> >>>
>>> >>> Mahmoud
>>> >>>
>>> >>>
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>>> >>>
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>>> >>>
>>> >>>
>>> >>>
>>> >>>
>>> >>>
>>> >>
>>> >>
>>> >> --
>>> >> Pavel Bykov
>>> >> ----------------
>>> >> Don't forget to help stopping the braindumps, use of which reduces
>>> value
>>> >> of your certifications. Sign the petition at
>>> >> http://www.stopbraindumps.com/
>>> >>
>>> >
>>> >
>>>
>>>
>>> --
>>> Pavel Bykov
>>> ----------------
>>> Don't forget to help stopping the braindumps, use of which reduces value
>>> of
>>> your certifications. Sign the petition at http://www.stopbraindumps.com/
>>>
>>>
>>> Blogs and organic groups at http://www.ccie.net
>>>
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