Originally Posted By: wfaulk
Well, if you already have rackmount equipment, and you can find the ears, then you're good to go, but I thought I would point out that most Cisco equipment I've worked with has had the ability to mount the ears on the device rotated 90° specifically so that you can mount it directly on a wall.

The 2921 and 2951 have a rectangular arrangement for the rackmount attachment holes and doesn't support turning the brackets 90 degrees. The smaller 1U 2900s do let you do that however.