| Myth | Reality | |------|---------| | This file boots the router | No – IOS-XE packages like asr1000-universalk9.17.03.02.SPA.bin do. ROMMON only initializes hardware. | | Higher version always better | Not if the hardware doesn’t support it. ROMMON 173-1r is not for RP1. | | You can downgrade ROMMON | Usually yes via the same upgrade rom-monitor command, but some hardware revisions block downgrades below a security baseline. | | It’s included in IOS-XE bundle | No – the .pkg is separate and must be downloaded from Cisco’s software portal. |
ROMMON upgrades do not take effect until a hard reboot is performed. Schedule a maintenance window and reload the router: Router# reload Proceed with reload? [confirm] Use code with caution. Copied to clipboard Step 4: Verify the Upgrade
If you are running a High Availability (HA) pair (two routers or an ASR with dual RPs), ensure both Route Processors are updated. In some cases, you may need to perform the upgrade on the standby RP explicitly or ensure the auto-sync feature is functioning correctly to avoid version mismatches between active and standby supervisors.
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(Alternatively, you can also use show rom-monitor slot R0 to see specific software levels). ⚡ Best Practices & Warnings
The version 17.3(1r) aligns with the Cisco IOS-XE release trains. ROMMON versions are not arbitrary; they are tied to specific IOS-XE releases.
Modern Cisco IOS XE releases (such as the 17.x train) often require a minimum baseline ROMMON version to execute properly. | Myth | Reality | |------|---------| | This
However, if you need to manually verify or upgrade, here is the workflow:
) and executed using the following command in privileged EXEC mode:
The text you've provided appears to be a filename: ROMMON 173-1r is not for RP1
Before downloading any files, verify your current ROMMON version and ensure you have sufficient flash storage space. Router# show platform Router# show rom-monitor slot R0 Use code with caution. Step 2: File Transfer
The asr1000-rommon.173-1r.spa.pkg file is a critical ROM monitor (ROMmon) upgrade for Cisco ASR 1000 series routers, specifically required for compatibility with Cisco and later releases. Key Considerations