This function greatly simplifies network renumbering and allows for automated prefix definition.įor example, a general prefix might be 48 bits long (“/48”) and the more specific prefixes generated from it might be 64 bits long (“/64”). When the general prefix is changed, all of the more-specific prefixes based on it will change, too. A general prefix (for example, /48) holds a short prefix, based on which a number of longer, more-specific prefixes (for example, /64) can be defined. The upper 64 bits of an IPv6 address are composed from a global routing prefix plus a subnet ID, as defined in RFC 3513.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module. For the latest caveats and feature information, seeīug Search Tool and the release notes for your platform and software release. Your software release may not support all the features documented in this module. An IPv6 generic (or general) prefix (for example, /48) holds a short prefix, based on which a number of longer, more-specific prefixes (for example, /64) can be defined. The IPv6 generic prefix feature simplifies network renumbering and allows for automated prefix definition.