Cisco IOS requires that the configured prefix-length, ge-value, and le-value meet the following requirement: prefix-length <= ge-value <= le-value. Otherwise, Cisco IOS rejects the ip prefix-list command.
- Filtering by Referencing IP Prefix Lists
- from CCNP Routing and Switching ROUTE 300-101: Official Cert Guide
- Publisher: Cisco Press
- Released: November 2014
actually this is the condition: len < ge-value <= le-value