Impact of changing Management IP Address

Question

Hello Devcentral Users,&nbsp;
is there any impact when changing the management ip of several BigIPs?
The expected impact is the network connectivity of management interface, but which other impacts are there?&nbsp;
I have at customer side 14 Cluster (28 Machines) which I have to change the management IPs. Most are BigIPs, several are Viprions (vCMP Guests).&nbsp;
Thank you and kind regards,
Kim&nbsp;

brad_parker · Answer

Yes, when you change the management IP your Device Trust is reset.  This can cause the devices to not trust each other and thus become Active/Active for the same traffic group.  You will need to rebuild the trust for them to communicate again.  This could potentially affect application traffic so I would recommend a maintenance period.&nbsp;

kim_stephan_510 · Answer

Hello Brad,&nbsp;
thank you for your answer.&nbsp;
I have to do all changes at maintenance windows.&nbsp;
Are there any problems with license? I don't think so but i'm not really sure. The license is not bound at IP-Adress, only at serial-.&nbsp;
Kind regards,
Kim&nbsp;

brad_parker · Answer

This shouldn't affect licensing at all.  One thing to keep in mind, is if you change the management IP of the vCMP guest within the guest, the vCMP host will not reflect that change.  I would recommend changing the vCMP guests' IP addresses/default route via the vCMP host in the vCMP config.  I would also recommend restarting SOD on all the blade instances of each of the vCMP guests or rebooting the guests all together or you'll get these notice events in your log until you do; Config digest module error: Traffic group device not found.  Support tells me this is due to SOD still looking for the old management IPs.  Its benign, but I thought I'd share.

emo_gokay_22518 · Answer

Yes it will break the HA or bring the HA in INOP state. 
Follow these steps below to change the management IP address w/o causing outage:
I hope this helps:&nbsp;
Reassign new mgmt. IP or change mgmt. IP to F5 that is in HA pair or environment &nbsp;
Create UCS file and download them to your PC from both unitsPut the F5 in question in standby mode Force it offline and KEEP it OFFLINE till you finish this processBreak the HA between those Units by resetting the trust on both units (they will read “standalone”)Make sure that unit in question is and stays in “OFFLINE” state Re-assign the new mgmt. IP and make sure you have access to it with the new IPMake sure that unit in question is still and stays in “OFFLINE” state Rebuild the HA with the new mgmt. IP from the active unitAdd the units/hostnames in the sync-failover group Sync the units from the active “self” and check the “override config” check boxif successful they should be in sync test the sync feature by creating a test http monitor on the active and sync it over if that replicates it on the offline F5 it is working and you can delete the test monitor and syncnow you can release the unit in question from “OFFLINE” stateif you need to re-assign new IP on the active unit as well, perform failover so the initial active becomes standby and repeat the process above starting from step 3

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Impact of changing Management IP Address

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