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Assign Multiple IPs to a Single BVI on Cisco FTD in Transparent Mode

irfanrtcomsa
Level 1
Level 1

Hello Community,

I am currently managing a Cisco FTD firewall in transparent mode via FMC, and I'm encountering a configuration challenge. Here are the details of my setup:

  • Firewall: Cisco FTD in transparent mode, managed through FMC.

  • Subnets in VLAN 1:

    • 10.31.0.0/20
    • 10.32.0.0/20
    • 102.0.0.0/8
  • Switch A: Connected to the firewall with servers that have NICs assigned to all three networks.

  • Switches B and C: Connected devices that send data to the servers. Each device has its own individual network.

Problem: I want the data from Switches B and C to pass through the firewall. However, I can only assign one IP to the BVI on the firewall, which allows traffic from only one network to pass and blocks the other two networks.

Question: Is there a way to assign multiple IPs to a single BVI on the Cisco FTD firewall in transparent mode? If not, what would be the best practice to enable traffic from all three networks through the firewall?

Also I cannot change the VLAN ID as the switches B,C as they are in remote locations

Any insights or alternative configuration suggestions would be greatly appreciated.

Thank you!

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