If you are upgrading to this image:
If you decide to use it:
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Cisco IOS image names are famously dense with information. Here’s the translation: cat4500es8-universalk9.spa.03.11.05.e.152-7.e5.bin
| Field | Value | Meaning |
|-------|-------|---------|
| Platform | cat4500es8 | Catalyst 4500 Series (specifically with the 8-port Supervisor Engine) |
| Feature Set | universalk9 | Universal image with K9 = cryptographic (SSH, VPN, etc.) support |
| Package type | spa | Supports Shared Port Adapters (modular line cards) |
| Major Release | 03.11.05.E | IOS 15.2(5)E – this is an IOS 15 derived train |
| Internal build | 152-7.e5 | Equivalent to IOS 15.2(7)E5 maintenance release |
| File extension | .bin | Bootable binary image |
In short: This is a unified IOS image for Catalyst 4500 series switches running IOS 15.2(7)E5. If you are upgrading to this image: If
In an era of pervasive snooping, the k9 feature is paramount. The Catalyst 4500 Sup8-E has hardware support for MACsec (IEEE 802.1AE). This image enables:
Use case: Securing uplinks between distribution switches in a campus environment where physical cabling passes through non-secure risers or data center interconnects. In short: This is a unified IOS image
If you have issued license right-to-use activate ipservices on 15.2(7)E5, you cannot downgrade to 12.2(xx) images. The license state data structure is incompatible. A downgrade will result in a switch that only boots IP Base, regardless of your previous entitlements.