From: Bob Sinclair (bsin@cox.net)
Date: Tue Dec 28 2004 - 00:32:55 GMT-3
Hi David,
When I reserve bandwidth for a class and apply that policy to an interface,
I should see the Available Bandwidth parameter decrease from 75% (default
max-reservable). Each time I reserve more bandwidth in an applied policy I
should see Available bandwidth (show interface) correspondingly decrease.
This did not happen when I entered the command to reserve bandwidth for
class class-default, further suggesting that the command is not effective.
HTH,
Bob Sinclair
CCIE #10427, CCSI 30427, CISSP
www.netmasterclass.net
----- Original Message -----
From: "David Duncon" <david_ccie@hotmail.com>
To: <bsin@cox.net>; <ccielab@groupstudy.com>
Sent: Monday, December 27, 2004 8:58 PM
Subject: Re: Class class-default
> Appreciate your feedback, Bob.
>
> As I did not quite get your point (attached clip bellow) , can you please
> elaborate ?
>
> <clip> it does not decrease available bandwidth on the interface. <clip>
>
> Cheers
>
> - David
>
>>From: "Bob Sinclair" <bsin@cox.net>
>>To: "David Duncon" <david_ccie@hotmail.com>,<ccielab@groupstudy.com>
>>Subject: Re: Class class-default
>>Date: Mon, 27 Dec 2004 08:17:17 -0500
>>
>>David,
>>
>>I would say definitely option 1. Is the bandwidth command really
>>effective in class class-default? On my box it takes the command, but it
>>does not show up in the output of "show policy-map interface," and it
>>does not decrease available bandwidth on the interface.
>>
>>HTH,
>>
>>Bob Sinclair
>>CCIE #10427, CCSI 30427, CISSP
>>www.netmasterclass.net
>>
>>----- Original Message ----- From: "David Duncon" <david_ccie@hotmail.com>
>>To: <ccielab@groupstudy.com>
>>Sent: Monday, December 27, 2004 2:54 AM
>>Subject: Class class-default
>>
>>
>>>Hi Group,
>>>
>>>I got a Q on MQC 'c class class-default behavior. And appreciate your
>>>guidance on this.
>>>
>>>On production network, let us consider that we have end to end L3 MQC
>>>policy which primarily aimed to protect Business critical apps such as
>>>Voice and Citrix and bundled every other traffic type such as File
>>>transfers , HTTP and Emails ..etc in to a common default class with
>>>random detect feature enabled. Since there is a bit of concern on the
>>>email (MS Exchange & Lotus Notes Domino) traffic with in a default class
>>>as we are seeing some drops there. So If we were to segregate &
>>>prioritize email traffic from the rest of default class traffic , then
>>>which of the following options is the better way to go. Either to leave
>>>the email traffic with in class class-default and assign a guaranteed
>>>bandwidth or to segregate email traffic in to separate class-map with in
>>>policy-map. The reason I am asking this Q is to understand any negative
>>>impacts the NON time sensitive email traffic can bring in to policy maps
>>>processing where already time sensitive traffic types (Voice & citrix)
>>>are being serviced.
>>>
>>>
>>>Option 1:
>>>=================
>>>
>>>Policy-map data
>>>
>>>Class voice
>>>Match access-group xxx
>>>Priority xxx
>>>
>>>Class citrix
>>>Match access-group xxx
>>>Bandwidth xxx
>>>
>>>Class email
>>>Match access-group xxx
>>>Bandwidth xxx
>>>
>>>Class class-default
>>>Random detect
>>>
>>>Option 2:
>>>==================
>>>
>>>Policy-map data
>>>
>>>Class voice
>>>Match access-group xxx
>>>Priority xxx
>>>
>>>Class citrix
>>>Match access-group xxx
>>>Bandwidth xxx
>>>
>>>Class class-default
>>>Random detect
>>>Bandwidth xxx ---------------------------------------> emails are bundled
>>>together along with file transfers & HTTP traffic with in class default.
>>>
>>>
>>>And my Qs are :
>>>
>>>1) is there any way where we can create 2 class-maps with in class
>>>class-default , one for email and the rest for all default traffic ? If
>>>yes is there any benefit in doing that ?
>>>
>>>2) or is it safe for me to create another class-map for email and slot
>>>that in with policy-map itself along with voice & citrix and dedicate
>>>certain amount of bandwidth to it.
>>>
>>>3) Thirdly , what is the between a class class-default with a bandwidth
>>>command and one with out a bandwidth command. And also what is the
>>>difference between a class class-default with a random detect command and
>>>one with out it. Though I do aware the functionality of congestion
>>>avoidance techniques such as WRED and RED , I was in the impression that
>>>besides configuring random detect , you need to map it to a relevant DSCP
>>>code which underlines a certain level of drop probability. In other
>>>words, you are telling the policy engine on what type of traffic you want
>>>her to drop should she pick up any early congestion warnings.
>>>
>>>
>>>Any feed back is much appreciated.
>>>
>>>- David.
>>>
>>>_________________________________________________________________
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>>>
>>>_______________________________________________________________________
>>>Subscription information may be found at:
>>>http://www.groupstudy.com/list/CCIELab.html
>>>
>>
>>
>
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