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New Member

switching "Maximum VLANs supported locally"

i have a problem, some switch have Maximum VLANs supported locally = 250 and others 64 or 68,.... how do i equal all switchs?

5 REPLIES

Re: switching "Maximum VLANs supported locally"

Hi Friend,

When we talk about 64 and 250 vlans it does not mean that you cannot create more than 64 vlans it just means that only 64 vlans will be having per vlan spanning tree instance.

For example 2950 as a VTP client will learn all normal-range VLANs, with VLAN IDs 1 to 1005; VLAN IDs greater than 1005 are extended-range VLANs and are not stored in the VLAN database. The switch must be in VTP transparent mode when you create VLAN IDs from 1006 to 4094.

Again mostly all switches support normal vlans upto 1005 but if we talk of per vlan spanning tree it depends on hardware and also on image it is running.

Like 2950 running standard image only supports 64 per vlan spanning tree and 2950 with enhance image supports upto 250 per vlan spanning tree instance but still both will let you create more than 64 and 250 vlans just that per vlan spanning tree instance will be only supported on 64 and 250 vlans depending upon image they are running.

And in this situation when you have more than 64 vlans on switch running standard image it is recommended not to run PVST+ but to confiure MST.

HTH, if yes please rate the post.

Ankur

New Member

Re: switching "Maximum VLANs supported locally"

Hi Ankur,

Do you have any more information when to change MST over PVST+

BR

Daniel

Re: switching "Maximum VLANs supported locally"

Hi Daniel,

MST is basically a protocol which enhances the STP features by adding different vlans to a single STP instance. PVST+ is a protocl which has a single instance for each and every vlan.

By using MST and adding diiferent vlans to a single STP instance certainly improves the STP designing in your n/w over the limitation of 64 or 250 STP instances.

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat2950/12119ea1/2950scg/swmstp.htm

HTH, Please rate if it does.

-amit singh

New Member

Re: switching "Maximum VLANs supported locally"

Do 2950 switch supported extended-rang vlans ?

Re: switching "Maximum VLANs supported locally"

Yes, it does support extended range vlans.

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat2950/12119ea1/2950scg/swvlan.htm

HTH, Please rate if it does.

-amit singh

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