Description Of L2 Protocol Frame Transparency Functionality; Overview - Alaxala AX2200S Series Configuration Manual

18 Extended VLAN Functionality

18.1 Description of L2 protocol frame transparency functionality

18.1.1 Overview

L2 protocol frame transparency functionality forwards Layer 2 protocol frames. The frames
that are forwarded include Spanning Tree BPDUs, and EAPOL for IEEE 802.1X. Usually,
protocol frames for these layers are not forwarded.
The frames forwarded are handled as simple multicast frames on the Switch, and are not
used as protocols by the Switch.
(1) BPDU forwarding functionality
The Switch can forward BPDUs when Spanning Tree Protocols are not used.
(2) EAPOL forwarding
The Switch can forward EAPOLs when IEEE 802.1X is not used. This functionality is used
when the Switch is used as an L2 switch between the Authenticator and terminal
(Supplicant).
Figure 18-1 Example application of EAPOL forwarding
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