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Forum Discussion

Sri_Narasimha_05's avatar
Sri_Narasimha_05
Icon for Altocumulus rankAltocumulus
Jan 30, 2023

Changing Management subnet Mask- F5 LTM

Hi Experts, We've a pair of F5's in HA where Firewall is the gateway with /29 subnet. Now, we'd like to expand the subnet from /29 to /28 to accomdate or install a new switch in our data center. . ...
application delivery
Sri_Narasimha_05's avatar
Sri_Narasimha_05
Icon for Altocumulus rankAltocumulus
Jan 31, 2023

Thanks for the reply, Is there any chance for failover or getting into split brain situation due to this?

Any idea

Paulius's avatar
Paulius
Icon for MVP rankMVP
Jan 31, 2023

Sri_Narasimha_05 Typically a split brain situation occurs because one device cannot reach the other on an interface and believes it is active because they other cannot be reached but both devices are actually up so they both become active. In this instance an ARP already exists so from a networking perspective they should be able to communicate with each other on the respective IP so that shouldn't happen. I do recommend doing this in a lab situation first because sometimes devices don't follow networking the way we would always expect them to and that could occur but it shouldn't.