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Software packages can have four states: inactive, active, committed, and superceded. Put simply, PIEs add functionality to the device, while SMUs fix defects. pie file extension, such as in asr9k-invmgr-5.2.4.CSCuz20763.pie. They are easily distinguishable from PIEs by the defect ID included in the filename as well as the. SMU versions are synchronized to the package major, minor, and maintenance versions they upgrade. Typically, SMUs do not have a large impact on router operations. SMUs are created to respond to immediate issues and do not include new features. Some SMUs fix one specific defect, while others bundle together multiple fixes for multiple defects. SMUs (Software Maintenance Upgrade) are nonbootable files that contain fixes for a specific defect. They are distinguishable by the word “pie” within the filename, such as asr9k-fpd-px.pie-5.2.4. Because the files are nonbootable, they are used to add software package files to a running router. PIEs (Packet Installation Envelope) are nonbootable files that contain a single package or a set of packages (called a composite package or bundle). Software packages are divided into two major groups: PIEs, and SMUs. For example, Cisco IOS XR Unicast Routing Core Bundle (known as mini) provides the main packages for use on every router. Bundles are groups of packages that can be downloaded as a set. Each package contains the components to perform a specific set of router functions, such as routing, security, or modular services card (MSC) support. Software TypesĬisco IOS XR software is divided into software packages so that you can select which features run on your router. Topics that are covered include software types and states, software package downloading, addition, installation, and commission, turbobooting an IOS XR device, and some common caveats an individual might encounter when upgrading or downgrading the software of an IOS XR device. This article highlights the basics of IOS XR software, with the end goal being the education of an individual who desires to understand and upgrade the software of an IOS XR device.

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