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Perhaps the most critical aspect of upgrading to asr1000-rommon.173-1r.SPA.pkg (ROMMON version 17.3[1r]) is the non-downgrade restriction. Once a router is upgraded to this version, it (e.g., versions 16.x or earlier).

Or, during boot, watch for:

The .spa.pkg file contains bundled hardware programming instructions. Upgrading stabilizes the communication between the Route Processor (RP) and the Embedded Services Processor (ESP), reducing line-card drops and bus errors under high traffic loads. Technical Specifications and Supported Hardware

Mastering the Cisco ASR 1000 ROMMON 17.3(1r) Upgrade ( asr1000-rommon.173-1r.spa.pkg )

Compare against Cisco’s published hash.

Modular chassis utilizing standalone Route Processors like the RP3 .

The upgrade requires a reload, and the router will be down for 5–15 minutes. Step-by-Step Upgrade Procedure

The system will write to the ROMMON storage – this takes ~30 seconds.

This article provides an exhaustive breakdown of this file—what it is, why version 173-1r matters, how to upgrade it safely, and how to troubleshoot when things go wrong.

ROMMON operates independently of the Cisco IOS XE software, but running an outdated ROMMON version on modern hardware can cause critical system failures. Upgrading to the 17.3(1r)SG release provides several key benefits: