3750's mixing EMI and SMI

Hey all,

Does anyone know what the results would be of mixing a stack of 3750 emi's
and smi's ?

Say you were to put the controller as an EMI, can you make the rest of the
stack smi's and maintain the emi capabilities....or does everything in the
stack need to be emi to do that?

Cisco link to back up the answer if you have it.

Thanks,
-Brian

 

I am using a 3550 with EMI and SMI's
I also have some 3548's in the stack.

Setup one port as a router on the EMI Switch. Configure your VLANS on the
EMI Switch with IP addresses on all VLANs. Setup the trunks to the other
swithes, Setup the VTP Domain the same on all switches....

 

At Networkers last year, the PM gave a 3750 session. He said mixed
emi/smi:
-- Isn't supported
-- Seems in general to work

 

Big difference between 3750's and 3550's or 3524/48's....

3750's connect via essentially a backplane connector creating a single
virtual switch with a 36gig backplane. Fairly new switch to Cisco's line.

3550's/2950's connect via a gbic/gigastack module, 1-2gig uplinks

I do agree with your statement 100% tho if they were 3550's !

Thanks anyways,
-Brian

 

Heya Chris,

I heard the same thing last year...... hey, were you sitting next to me? You
the one that stole my damn mug?<G>

It appears that some things have changed tho...here's a link that I found
while doing some research after posting earlier:

emi/smi can be mixed/used in a stack.
emi should be the master
recomended that atleast 2 switchs in the stack be emi (to support redundent
emi)

Other than that I'm not finding too much on it....quite a big difference in
pricing of the switches. I'm really surprised there's not more out there on
it.

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3750/12119ea1/3750scg/swstack.htm#1172299

Later,
Brian

 

Brian,
Thanks for the reference. It looks like they've changed their
support since Networkers. This is good -- I have several
applications where it would be cost-effective to mix emi and smi in a
stack.

What they seem to be saying for both EMI and crypto that if the
master fails, one will loose the EMI and/or crypto functionality
unless the backup also has these features. That seems reasonable.

/Chris