We have several vlans... one for each building. One building is using up almost all available IP addresses. Currently the subnet mask is 255.255.254.0 so we have a total of 508 usable addresses. We have 2 options, add another vlan to the building or change the subnet mask to allow more IP addresses.
For manageability, it would be preferable for us to change the subnet mask and up the number of available hosts on the subnet. The thing I'm wondering is what number of nodes would be acceptable to have on a vlan? We have a Cisco 4006 and I want to make sure we do not impede performance.