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atifali's avatar
atifali
Icon for Altocumulus rankAltocumulus
May 29, 2025
Solved

How to replace F5 LTM which is failed from HA stack, I dont have backup config of failed BIG IP F5

Hi,    Dear F5 Community and Seniors, One of my F5 failed from HA(Total 2 F5)  and I want to replace it with other F5 obtained after RMA. Unfortunately i dont have backup file of that failed f5, n...
bigip
f5 ltm
  • Injeyan_Kostas's avatar
    Injeyan_Kostas
    May 29, 2025

    First of all why running such an old and usupported version?

    Now to your question, you can just deploy the new F5 with vlans, self IPs, DNS, NTP.
    Then add it to the cluster and sync.

VGF5's avatar
VGF5
Icon for Cumulonimbus rankCumulonimbus
May 30, 2025

You do NOT need a backup of the failed device. The correct process is to add the new device to the trust and device group, ensure network/HA settings match, and then perform a full config sync from the active device. This will replicate all configuration (VIPs, pools, etc.) to the new device, making it the standby/secondary in the HA pair.

Please check below articles:

K51396049: Creating new HA Pair, both devices are Active 

K44885200: Unable to sync configuration between HA pair after updating their ConfigSync IPs

K42161405: Rebuilding device trust using the Configuration utility (11.x - 15.x)