You should upgrade your ROMMON when Cisco technical documentation specifies that the new IOS XE software requires it. The 17.3(1r) version is typically needed for: Resolving boot failures or hardware recognition issues.
The upgrade is applicable to various hardware components including Route Processors (RPs), Embedded Services Processors (ESPs), and SPA Interface Processors (SIPs). It is often a prerequisite for moving older platforms like the or 1002-HX toward the final supported releases of the 17.3 train.
Upgrading ROMMON is safe but requires precision. A power loss during ROMMON write can brick the router. Follow these steps exactly.
Version 17.3(1r) strengthens the Secure Boot architecture of the hardware, protecting the router from malicious, unauthorized modifications to the bootloader code. Step-by-Step Upgrade Procedure asr1000-rommon.173-1r.spa.pkg
Engineers should be aware that after completing the ROMMON upgrade, the router must be reloaded to make the new ROMMON permanent. The upgrade process flashes the ROMON, repartitions the flash memory, and rewrites the necessary components.
Engineers may encounter the %ASR1000_APPLIANCE-3-ROMMON_UNSUPPORTED error message, which indicates that virtualization is not supported by the current ROMMON configuration. This requires verifying both the ROMMON version and the ROMMON variable ENABLE_VTX are correct to enable virtualization features.
Once the operating system loads, re-verify your boot system variables using show bootvar and set them correctly in the configuration mode. Dual RP Out-of-Sync Errors You should upgrade your ROMMON when Cisco technical
Another known problem is that ROMMON versions older than 16.9(5r) may fail to boot Cisco IOS software images larger than 1GB. This issue affects ASR1000-RP2 and ASR1000-RP3 modules, particularly when upgrading to IOS XE version 16.10 or newer where image sizes exceed 1GB. The solution is to upgrade ROMMON to 16.9(5r) or newer and upgrade FPGA to version 17071402 or newer.
: After upgrading IOS-XE to version 17.6.3a with ROMMON 17.3(1r), the router may display "Invalid input detected" logs and interfaces remain "admin down".
| Component | Meaning | |-----------|---------| | | Platform family (ASR 1000 series – including ASR 1001-X, 1002-HX, 1004, 1006, etc.) | | rommon | ROMMON – the bootstrap firmware stored on the RP (Route Processor) or ESP (Embedded Services Processor) | | 173-1r | Version number: Major version 173, minor version 1, revision r (often indicates a rebuild or service pack) | | spa | Shared Port Adapter – though here, it indicates the package type for the SPA/driver environment | | pkg | Package file – the installable software bundle for the IOS XE ecosystem | It is often a prerequisite for moving older
for a specific ASR model (e.g., ASR1001-X, ASR1004). Explain what to do if you get a checksum error. Provide advice on validating the signature of the file. Share public link
The file is a critical system bootstrap (ROMMON) firmware package used to upgrade the bootloader on Cisco ASR 1000 Series Routers . Upgrading ROMMON is typically required before migrating your router to modern Cisco IOS XE 17.x software releases. 📋 Key Details at a Glance File Name : asr1000-rommon.173-1r.spa.pkg
Prepares the Route Processor (RP), Embedded Services Processor (ESP), and Shared Port Adapters (SPAs) for operation.
Depending on your exact Cisco IOS XE train, the upgrade syntax varies slightly. If upgrade rom-monitor is unrecognized, consult your context-sensitive help ( upgrade ? ) to identify the exact command keyword mapping for your release.