It is often the "sweet spot" for mixed environments where older line cards must coexist with newer Supervisor engines. Deployment Tips
: Some users have reported odd OSPF adjacency drops on Catalyst 4500-X cat4500e-universalk9.spa.03.11.04.e.152-7.e4.bin
For detailed bug fixes and compatibility, you can check the official Cisco Catalyst 4500E Release Notes . It is often the "sweet spot" for mixed