[c-nsp] 3750 Stack-Wise

[cisco at confluence.com]

I think only the stack master has to be EMI.  The rest of the switches in
the stack could be SMI. However, if the switch with the EMI image died, then
the new stack master would be running the SMI image and you'd lose your EMI
capabilities.

So if you had a stack of (6) 3750's, and you had two of them with EMI images
and four SMI, you would have redundant EMI stack masters and save some cash
on the remaining four switches.  Just set the stack member priority values
so that your two EMI switches have higher priority than the SMI switches.

check out:
http://www.cisco.com/en/US/products/hw/switches/ps5023/products_configuratio
n_guide_chapter09186a008017ed92.html

"The system-level features supported on the stack master are supported on
the entire switch stack. If the switch stack must have switches running both
standard multilayer software image (SMI) and enhanced multilayer software
image (EMI) software, we recommend that a switch running the EMI software be
the stack master. EMI features become unavailable if the stack master is
running the SMI software."

-Brian

-----Original Message-----
From: lists at hojmark.org [mailto:lists at hojmark.org]
Sent: Thursday, January 20, 2005 4:48 PM
To: 'Ziv Mosery'; cisco-nsp at puck.nether.net
Subject: RE: [c-nsp] 3750 Stack-Wise


> Any one has any issues with running several 3750 with 
> stack-wise cables?

No problems with that. When stacking 3750s, the stack in all practical sense
becomes one switch. Actually, you can think of it sort of like a
chassis-based switch, when the chassis has been removed and the backplane
replaced with cables on the back. (Only, here you have as many supervisors
as you have switches).

> I want to have inter-vlan routing, EIGRP, not anything too 
> complicated.

Well, for EIGRP you'll have to buy the EMI (Enhanced Multilayer Image), and
do so for every switch in the stack. For a large stack, full layer 3
capability therefore becomes somewhat expensive.

Also, the plain 3750s can't (yet?) be stacked with the 3750 Metro, which is
a shame.

-A

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