The firmware package asr1000-rommon.173-1r.spa.pkg is the ROM Monitor (ROMMON) image for the Cisco ASR 1000 Series Aggregation Services Routers. It is specifically used to upgrade the low-level boot code on hardware components like Route Processors (RP), Embedded Services Processors (ESP), and line cards (SPA Interface Processors). Why You Need This Upgrade

: Providing a low-level environment to recover from lost passwords, corrupted software images, or hardware failures Separation of Powers

Step 5: Reboot with Power Cycle

A standard reload may not be enough. On most ASR1000 chassis:

, once you upgrade to version 17.3(1r), you cannot revert to an earlier ROMMON version.

Part 3: Which ASR 1000 Platforms Use This File?

The asr1000-rommon.173-1r.spa.pkg is compatible with all ASR 1000 series that use the SPA-based architecture and separate RP/ESP. Specifically:

Have you encountered any specific issues upgrading ROMMON on the ASR 1000 series? Let us know in the comments.

Step 6: Verify

After boot, re-run:

Asr1000-rommon.173-1r.spa.pkg May 2026

The firmware package asr1000-rommon.173-1r.spa.pkg is the ROM Monitor (ROMMON) image for the Cisco ASR 1000 Series Aggregation Services Routers. It is specifically used to upgrade the low-level boot code on hardware components like Route Processors (RP), Embedded Services Processors (ESP), and line cards (SPA Interface Processors). Why You Need This Upgrade

: Providing a low-level environment to recover from lost passwords, corrupted software images, or hardware failures Separation of Powers asr1000-rommon.173-1r.spa.pkg

Step 5: Reboot with Power Cycle

A standard reload may not be enough. On most ASR1000 chassis: The firmware package asr1000-rommon

, once you upgrade to version 17.3(1r), you cannot revert to an earlier ROMMON version. On most ASR1000 chassis: , once you upgrade to version 17

Part 3: Which ASR 1000 Platforms Use This File?

The asr1000-rommon.173-1r.spa.pkg is compatible with all ASR 1000 series that use the SPA-based architecture and separate RP/ESP. Specifically:

Have you encountered any specific issues upgrading ROMMON on the ASR 1000 series? Let us know in the comments.

Step 6: Verify

After boot, re-run: