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Forum Discussion

Kevin_Tang's avatar
Kevin_Tang
Icon for Nimbostratus rankNimbostratus
Jan 12, 2021

multiple floating self IPs for the same vlan and within the same traffic group

Hi, Is that a valid config to give more than 1 floating self IPs for the same vlan in F5 LTM? Also with the same traffic group setting. I saw on F5 LTM cluster configured this way and looks like st...
application delivery
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Floating
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Amine_Kadimi's avatar
Amine_Kadimi
Icon for MVP rankMVP
Jan 12, 2021

Having two floating IP in the same VLAN is a working scenario and I am not aware of any problem it can cause, however since you are using SNAT and as per K7820:

 

If multiple floating self IP addresses are configured on the VLAN, the BIG-IP system translates the address of client connections by alternating through a pool of all floating self IPs on the VLAN.

 

Regarding MAC addresses, the BIG-IP will advertise the physical interface MAC of the active node for arp reponses for 10.17.16.20 and 10.17.16.21 unless you configure MAC Masquerade in the traffic group.