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Re: maximum active vlans in a crisco 6509
From: "Stephen Sprunk" <ssprunk () cisco com>
Date: Wed, 21 Jun 2000 13:27:38 -0500


Sez "Roeland Meyer (E-mail)" <rmeyer () mhsc com>

Bob Biver: Tuesday, June 20, 2000 7:28 PM
the docs say max 250, is this informational or a limit of
spanning tree?

The docs say 1000, actually.

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/sw_5_5/cnfg_
gd/vlans.htm#xtocid225297

I'd worry if you plan on having more than 100 STP instances on a switch;
if you're doing single-port VLANs, do yourself a favor and disable STP
for those VLANs.

also,
is anyone running more than 250 ?

There's probably someone doing it somewhere.

If I recall correctly, that's also real close to the maximum
number of physical connections to the chasis, with all modules
installed. Personally, I've never run anywhere near that number.

It's possible to have 384 FE connections in a single Cat6509 today.  I
do it frequently, but not with each in a different VLAN.

I don't think it is useful to have less than 2 members in a vlan.

You forget that the routing module (aka MSFC) might be the other member,
not counting as a physical port.

You would also be surpassing the bandwidth limitations of that
chasis, even if all the connections were 100baseTX.

Oversubscribed by 20%.  In reality, a Cat6509 doing end-user
aggregation, loaded to the hilt with 10/100 ports, will rarely see 10%
utilization.

S

     |          |         Stephen Sprunk, K5SSS, CCIE #3723
    :|:        :|:        Network Design Consultant, HCOE
   :|||:      :|||:       14875 Landmark Blvd #400; Dallas, TX
.:|||||||:..:|||||||:.    Email: ssprunk () cisco com




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