From: Howard C. Berkowitz (hcb@gettcomm.com)
Date: Thu Apr 08 2004 - 01:00:59 GMT-3
At 9:18 PM -0500 4/7/04, Church, Chuck wrote:
>Thanks for the info. Naming standards is exactly the reason.
>
Wes makes some excellent points. I haven't worked with VTPv3 -- to be
honest, I didn't even know there was one out, although the need to
have VTP for extended range VLANs is pretty obvious. Extended range
VLANs tend to make me a little nervous, in wondering what else they
might break that assumes 1024 max, such as network management tools.
I realize all I'm doing is giving you something else to worry about,
but I like the story about an optimist and a pessimist, both of whom
have their garage catch on fire. The optimist moans this can't be
happening, while the pessimist grabs the cell phone to call 911 (the
POTS lines burned up in the garage), knocks down some of the fire
with the extinguishers at the ready, then backs off and uses the
garden hose to keep the roof of the house wet. I prefer to design
pessimistically, planning for the worst. Annlee Hines is probably a
better pessimist than I am!
Unfortunately, the link I had to a source of Big (foam rubber) Clue
Bats is dead. You might need a supply for some of your operators.
> > -----Original Message-----
>> From: Wes Smith [mailto:wesmith@rogers.com]
>> Sent: Wednesday, April 07, 2004 6:14 PM
>> To: Howard C. Berkowitz
>> Cc: ccielab@groupstudy.com
>> Subject: Re: OT: 4096 VLAN support
>>
>>
>> Well one circumstance is naming standards. Another is a
>> desire to have
>> completely unique vlan'id's thruout a large campus.
>> (again naming standards... ie, vlan 20 is the 2nd floor , 30 is the
>> 3rd etc)
>>
>> Service providers doing ethernet lan extentions are another.
>>
>> You're right about VTP. You need VTP Ver3 to support the
>> expanded range
>> vlans.. Really new stuff.
>>
>> Re switches. All of the C4K, 4500, 5000, 6000 and 2950/3550 support
>> extended vlans.
>> None of the ...2900xl and 3500xl do.
>>
>> Howard C. Berkowitz wrote:
>>
>> > At 8:12 AM -0500 4/7/04, Church, Chuck wrote:
>> >
>> >> All,
>> >>
>> >> Sorry about the OT, but does anyone have a list of which Cisco
>> >> switches support the 1025-4096 VLANs using dot1Q? I looked for a
>> >> while on CCO, but never found a comprehensive list. I'm most
>> >> interested in 3550s (which I'm pretty sure do), 3500XLs,
>> and Sup 1 &
>> >> 2 for the cat 4000s and 4500s.
>> >>
>> >
>> > Might I ask a couple of questions, just for my own sense of such
>> > problems?
>> >
>> > What drives the requirement for such a large number of
>> VLANs? A large
>> > campus? Are the VLANs divided by physical constraints (e.g.,
>> > building/floor), or are they application/departmental?
>> >
>> > Are you using VTP? Will it be an operational constraint
>> that it has
>> > trouble with extended range VLANs?
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