[c-nsp] No. of vlans supported on 4948

[Mack McBride]

There are other limitations if you are running rapid pvstp vs mstp or HSRP.
pvstp and HSRP are CPU bound processes and can eat a lot of CPU.
If you go too high on the CPU, there will be issues.
Too high is very relative and very specific to an environment.

LR Mack McBride
Network Architect

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of CiscoNSP_list CiscoNSP_list
Sent: Tuesday, February 05, 2013 10:17 PM
To: td_miles at yahoo.com; cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] No. of vlans supported on 4948


 Thanks Tony.
 Date: Tue, 5 Feb 2013 20:46:45 -0800
From: td_miles at yahoo.com
Subject: Re: [c-nsp] No. of vlans supported on 4948
To: cisconsp_list at hotmail.com; cisco-nsp at puck.nether.net

Not sure whether/how you can see this but it will be 4096 which is from the IEEE 802.1Q standard (as well as what the spec docs say). I've run a few commands on some 3550/3750 and can't find anything that specifically says how many VLANs are supported by the box itself (ie. from a "show" command).

As to whether there are other limitations in how many you can actually configure/use at once on this device, I don't know about that.


regards,
Tony.


     
   From: CiscoNSP_list CiscoNSP_list <cisconsp_list at hotmail.com>
 To: "td_miles at yahoo.com" <td_miles at yahoo.com>; "cisco-nsp at puck.nether.net" <cisco-nsp at puck.nether.net> 
 Sent: Wednesday, 6 February 2013 2:22 PM
 Subject: RE: [c-nsp] No. of vlans supported on 4948
   




 
 
Thanks for the clarification Tony - What is the command to show how many vlans the switch supports?
 
 
 
"sh vlan summary" shows how many are used, but not how many are supported/available?

 
 
Date: Tue, 5 Feb 2013 19:59:37 -0800
From: td_miles at yahoo.com
Subject: Re: [c-nsp] No. of vlans supported on 4948
To: cisconsp_list at hotmail.com; cisco-nsp at puck.nether.net

Hi,

That is the number of VLAN's supported by VTP (VLAN trunking protocol), not the switch itself.

===
VTP version 1 and version 2 support only 
normal-range VLANs (VLAN IDs 1 to 1005). In these versions, the switch 
must be in VTP transparent mode when you create VLAN IDs from 1006 to 
4094. Cisco IOS Release 12.2(52)SE and later support VTP version 3. VTP 
version 3 supports the entire VLAN range (VLANs 1 to 4094). Extended 
range VLANs (VLANs 1006 to 4094) are supported only in VTP version 3. 
You cannot convert from VTP version 3 to VTP version 2 if extended VLANs
 are configured in the domain. 

===

regards,
Tony.

        From: CiscoNSP_list CiscoNSP_list <cisconsp_list at hotmail.com>
 To: "cisco-nsp at puck.nether.net"
 <cisco-nsp at puck.nether.net> 
 Sent: Wednesday, 6 February 2013 1:07 PM
 Subject: [c-nsp] No. of vlans supported on 4948
   





Hi Guys,
 
 
Following doc states that the 4948 supports 4096 vlans:
 
 
http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps6021/product_data_sheet0900aecd8017a72e.html
 
 
 
But if I run "sh vtp status" on one of our 4948's it states it only supports 1005 vlans?
 
 
Feature VLAN:
--------------
VTP Operating Mode                : Transparent
Maximum VLANs supported locally   : 1005
   Cheers.         
                  
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