Cisco IOS image banners are strings that display information regarding the type of build from which the Cisco IOS image was produced, the release name, and whether it is an interim build, a maintenance build, or a rebuild. An fc2 build cannot be created if the first build was already released to a public directory. If a catastrophic defect is found in a maintenance version of a software after it was released to the public, Cisco may decide to fix the defect in and re-release a new version with the fix as a rebuild image. The defective image is usually deferred and made inaccessible to customers. Experimental Cisco IOS special images.
Image built by individual engineers to incorporate engineering changes.
The following are examples of the show version command output on various Cisco IOS release types. Early Deployment Release Software Cisco IOS maintenance images on a specific Technology or X release trains. Maintenance Interim Software Cisco IOS interim builds on major releases. Beta Test Software Pre-released builds of major releases. Note that version number has a leading zero.