Cisco ASR5K-02-FSR21= System Software Release 21.0

Operate Cisco ASR5000 and ASR5500 packet-core systems with Release 21.0 system software under the VZW-only designation. This software item applies the named release to those ASR platforms rather than supplying a hardware appliance or add-on module. Its scope is platform software, giving network operators a defined release target for supported packet-core nodes. ASR5K-02-FSR21= ties the Release 21.0 designation to the ASR5000 and ASR5500 system-software family. That distinction matters where the installed platform must remain aligned to a particular software release. The code is explicitly marked for VZW-only use, so it belongs with environments governed by that designation. It does not represent a general-purpose desktop operating system or physical network component. For mobile-core environments, system software determines the release level running on the ASR platform and should align with the platform already deployed. This item covers two named platform families, which differentiates it from software scoped to a single appliance class. Record the exact release, platform family, and VZW designation when validating the order against the intended network environment. No physical chassis, interface card, cable, or mounting hardware is represented by this software item.