[482] in resnet
Re: Keeping traffic internal
daemon@ATHENA.MIT.EDU (Scott Genung)
Sat Dec 1 18:49:31 2001
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; format=flowed
Message-ID: <4.3.1.2.20011201171657.03f29df8@mail.ilstu.edu>
Date: Sat, 1 Dec 2001 17:35:45 -0600
Reply-To: Resnet Forum <RESNET-L@listserv.nd.edu>
From: Scott Genung <sagenung@ILSTU.EDU>
To: RESNET-L@listserv.nd.edu
In-Reply-To: <ECEBIACDOPGEFFBFMCFKAEDACCAA.mking@bridgew.edu>
At 05:53 PM 12/1/2001 -0800, you wrote:
>Very true, most bandwith shaping products are a single point of failure.
It's not the product that creates a single point of failure. That problem
comes from how the product is implemented within a network.
If you shape at your egress (as we do), you can implement multiple shapers
in your network so that a single point of failure doesn't exist.
Furthermore, you can load balance shaping to enhance your ability to scale
this model. We have done this with four PacketShapers in our environment.
Cost? Yes, these products cost a great deal of money. However, additional
Internet capacity and time spent by well paid engineering staff chasing
bandwidth starvation issues cost a great deal more. Where do you want to
spend your resources?
Someone brought up the topic of using QoS in a Cisco router. We actually
started there - first with CAR and then later NBAR.The problem is that the
vendor needs to be responsive to the needs of the Universities when it
comes to emerging applications. When we did our NBAR pilot with Cisco
during the summer of 2000, we had applications that would quickly emerge
and disappear from our radar screens. Cisco told us that it would to 3 to 4
weeks to write macros for them. That is not responsive.
Even with QoS, we will all be forced to add more capacity because we will
all continue to see growth - more users, more bandwidth consumed by any
one user, and a higher frequency of use. Excessively shaping these
applications is the same thing as blocking them - or at least that is an
opinion of some of our students. There is no silver bullet here. Shaping,
education, and adding capacity are all ingredients to the solution.
Scott Genung
Manager of Networking Systems
Telecommunications and Network Support Services
Illinois State University
(309)438-8731 http://www.tnss.ilstu.edu
___________________________________________________
You are subscribed to the ResNet-L mailing list.
To subscribe, unsubscribe or search the archives,
go to http://LISTSERV.ND.EDU/archives/resnet-l.html
___________________________________________________
