Re: maximum active vlans in a crisco 6509

["Stephen Sprunk" <ssprunk () cisco com>]

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
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