End-of-Life (EoL)

Layer 2 Interfaces

In a Layer 2 deployment, the firewall provides switching between two or more networks. Devices are connected to a Layer 2 segment; the firewall forwards the frames to the proper port, which is associated with the MAC address identified in the frame. Configure a Layer 2 Interface when switching is required.
Layer 2 Deployment
In a Layer 2 deployment, the firewall rewrites the inbound Port VLAN ID (PVID) number in a Cisco per-VLAN spanning tree (PVST+) or Rapid PVST+ bridge protocol data unit (BPDU) to the proper outbound VLAN ID number and forwards it out. The firewall rewrites such BPDUs on Layer 2 Ethernet and Aggregated Ethernet (AE) interfaces only.
A Cisco switch must have the loopguard disabled for the PVST+ or Rapid PVST+ BPDU rewrite to function properly on the firewall.
The following topics describe the different types of Layer 2 interfaces you can configure for each type of deployment you need, including details on using virtual LANs (VLANs) for traffic and policy separation among groups.

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