The answer depends more on your network topology than on any absolute numbers. If you are talking about a small remote site with a single switch connected to an edge router, a single voice VLAN is fine. If you are talking about a larger site or campus, best practice dictates separate voice VLANs for every edge switch, with layer 3 switching enabled. That will allow you to load balance over multiple layer 3 uplinks to your core, and will also result in faster failover if one the links drops.
If you cannot run layer 3 links to the edge you will run into Spanning Tree constraints, though using Cisco features like Uplinkfast (or 802.1W) will speed up failover. You would then need ar least 2 VLANs on each edge switch, if you wanted to be able to load balance your traffic over multiple layer 2 links. Those same 2 VLANs could be used on multiple edge switches.
I have never seen a number on max phones per VLAN, but since they are not broadcast intensive, the practical limit is probably pretty large. My personal, conservative approach has been to use 24 bit mask subnets, limiting the max to 253. The big risk in a large flat network would be someone screwing up a switch config, creating a loop, resulting in a broadcast storm that would knock down an entire subnet. Limiting the size would reduce this risk somewhat.
You have reached the Cisco Logistics Support Center.. To Check Status of
your RMA, visit Product Returns & Replacements (RMA). Need help? Contact
us by Phone or Email. North Americas Phone: 1800 553 2447 Option 4
Email: email@example.com Europe Phone: +3...
The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...