From: Chris Johnston (chris@routerguy.com)
Date: Tue Feb 11 2003 - 05:32:07 GMT-3
And to follow on and not sound like a real Cisco bigot, but... 3Com had
this nasty habit of saying "well ,we can do 24GB on the CB". This is
because their math added the bandwidth of each blade to come up with a
marketing number. Cisco had the true bandwidth across the bus and then
came out with the SFM to get you to 210Megapackets/sec.
I ran into this on a competitive bid. Oddly enough shortly after we
lost the bid, 3Com got out of the big iron business and 6 months later
we got it anyway. Oh well.
Chris Johnston <chris@routerguy.com>
714-306-5746
949-653-8819 (fax)
So tell me again. How do I set my laser printer to stun?
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Matt Dexter
Sent: Monday, February 10, 2003 11:40 PM
To: Ong Boon Hui; ccielab@groupstudy.com
Subject: Re: Anyone knew what is the backplane capacity for Corebuilder
9000
3com originally came out with a 16 blade chassis and the fabric module
went in slot 8 with a redundant option in slot 9. The modules were just
blade versions of CoreBuilder 3500s, SuperStack 3900s and SuperStack
9300s, etc.
After the CB9000 16 blade version 3com came out with a 7 blade version
and it had one (non-redundant) 24 Gig fabric module. I think they had a
8 slot version too that allowed redundant fabrics. Later they changed
it to a 4000 series core switch (when they shutdown a ton of their
production of Corebuilders).
The original 3com CB9000 16 slot had 2 Gig per blade in slots 1 - 12 and
1 Gig per blade in slots 13 - 16 and 24 1 Gig ports for the cross bar.
For example ports 21 and 22 of blade 1 linked to ports 1 and 2 of the
fabric.
In comparison a Cisco 6500 with SFM has 8 Gig per slot for each fabric
enabled blade. Taking full duplex and architecture into account those
numbers go up. Apples to apples its 2 Gig to each slot (most cases) vs
8 Gig to each slot. The 3com buffers and stores packets much
differently than the 6500 and having used both it appeared to me the
Cisco 6500 moves data faster.
If you look today at a 4007 you can get a 18 Gig or 48 Gig fabric. The
48 Gig fabric is probably the same fabric as the original 24 Gig fabric
but with the math done differently.
Regards,
Matt.
----- Original Message -----
From: "Ong Boon Hui" <ongbh@cet.st.com.sg>
To: <ccielab@groupstudy.com>
Sent: Monday, February 10, 2003 7:33 PM
Subject: OT: Anyone knew what is the backplane capacity for Corebuilder
9000
> Hi Group,
>
> Does anyone know what is teh backplane for CoreBuilder 9000 ?
>
> Rgds,
> Debarros
> .
.
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