From: Alex (alex.arseniev@gmail.com)
Date: Tue Oct 30 2007 - 11:16:02 ART
Ryan,
You could use "fair-queue" in Bulk traffic class to achieve fair bandwidth
allocation and reduce delay.
http://www.cisco.com/en/US/products/sw/iosswrel/ps5187/products_command_reference_chapter09186a008017cf0c.html#wp1135395
But you need a VIP platform to do that.
Rgds
Alex
----- Original Message -----
From: "Ryan Morris" <ryan@egate.net>
To: <ccielab@groupstudy.com>
Sent: Tuesday, October 30, 2007 1:06 PM
Subject: Real Life QoS Question
> Hi everyone,
>
> I'm developing a standardised QoS model for our enterprise. Using Tim
> Szigeti's 4/5 class model as a basis, I'm wondering if anyone has real
> world experience mapping applications to queues over the wide area.
> Here's a breakdown of my current plan:
>
> Voice: 10% priority queue (that's enough to cover all the calls our IP
> trunks are licensed for, plus additional room for overhead)
>
> Bulk: 5% Here I'm looking at mapping Lotus Notes and file transfer
> traffic. See problem below
>
> Critical: 37% Database apps, call signalling, and identified high
> priority web apps (http & https)
>
> Best effort: 25% Everything else
>
> These numbers map fairly well to our measured traffic ratios over time,
> except when someone overloads the link with Lotus Notes or file transfer.
>
> Current problem: someone doing a large Lotus Notes replication or a large
> file transfer can congest the WAN and affect the performance of the file
> transfer traffic and vice versa. If I map Lotus Notes and file transfer
> to the same queue, this problem still exists. Note that our Windows file
> servers are centralised using WAN accelerators, so there's an interactive
> component to the file transfer traffic (i.e. I'm trying to use the Open
> function in MS Word) that is sensitive to delay.
>
> Solution: create 2 queues, one for Notes and one for file transfer, to
> ensure both are allocated bandwidth.
>
> Question: should we stick with a low bandwidth percentage for these
> queues, or should I bump it up to say, 20% each and reduce my critical
> data queue? Alternatively, I could map the file transfer traffic to the
> critical data queue, due to the interactive component.
>
> Any thoughts or real world experience would be appreciated.
>
> Thanks,
>
> Ryan Morris
> CCIE #18953
>
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