[cisco-voip] Voice VLANs and Multiple Switches ?

[Jason Aarons (US)]

I'm seeing Cisco Advanced Services set the access layer 3750s to
trunking but the native vlan is routed and wireless vlan trunked.  The
CUWN/LWAP access point vlan is the only thing going out to all access
layer 3750s from distribution 6500s.  I assume this allows fast secure
wireless roaming.

 

In short each closet has its own data/voice vlans, but a common vlan
across all switches for 1252 Access Points.

 

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Ben Story
Sent: Tuesday, December 09, 2008 11:21 AM
To: Dane
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Voice VLANs and Multiple Switches ?

 

You are correct in your notion that Cisco recommends a best practice to
not span VLANs between multiple switches (unless those switches are
acting a stackwise stack like the 3750 or 3750-E).  I believe you can
find this recommendation in the Campus Network for High Availability
SRND at
http://www.cisco.com/en/US/docs/solutions/Enterprise/Campus/HA_campus_DG
/hacampusdg.html amid the Spanning Tree recommendations.

On Tue, Dec 9, 2008 at 10:16 AM, Dane <dane at pktloss.net> wrote:

Someone correct me if I am wrong please, but I have always been under
the perception that when it comes to voice vlans (actually any vlan
really) that Cisco recommends as a best practice to keep vlans from
spanning multiple switches?

For instance, say you have a building with four access switches
dispersed throughout.  Isn't the best practice to maintain a seperate
voice and data vlan per access switch?  So I should four data and four
voice vlans in this example.

Simply looking to determine if it is in fact Cisco best practice.
Anyone happen to have anything from Cisco to confirm or deny this?
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-- 
Ben Story CCSP, CCDA




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