[nsp] bandwidth manager

[BALLA Attila]

Hi!

	I attended a Packeteer course last month, and it supports ISL
trunking. The productline is from PacketShaper 1500 to 8500. These devices
have two 10/100 Ethernet port by default, and LAN Extension Module, so you
can connect 4 LANs (except the smallest device, PS1500).

Attila

On Fri, 2 Aug 2002, Tony Wasson wrote:

> > On Thu, 1 Aug 2002 19:08:18 -0700 (PDT) Benjie Ko <gerwalk1@yahoo.com>
> wrote:
> > > Is it possible to put a transparent ethernet bridge
> > > (bandwidth manager) between two cisco switches doing ISL
> > > trunking?
>
> I think your bridge will be confused because the Ethernet Addresses won't be
> at the front of the frame. The ISL format is like this:
>
> ISL Header | Original Frame | FCS
> http://www.cisco.com/warp/public/473/741_4.html
>
> ISL may work if the bandwidth manager only allows 'n' frames in each
> direction. I'd imagine the box you want is more sophisticated; you can
> probably configure bandwidth based on L3 or L4 information. Once ISL has
> shifted your frames, the bandwidth manager won't find the L2 or L3
> information where it expects.
>
> 802.1q would work in this situation, but you might see giant sized frames
> come through the bandwidth manager. I have used 802.1q over some 10Mbps
> radio links where we HAD to allow 2 VLANs. As long as your bandwidth manager
> won't disable ports due to errors, you'll be all set.
>
>
> Hope this helps!
> Ton Wasson
>
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