Specifications

Chapter 1 Introduction Installation and Operation Manual
1-8 Functional Description LA-210 Ver. 1.5
are members of this specific VLAN, enabling a total separation between different
VLAN users within the same bridge.
Bridge Features
• Full VLAN-Aware bridge in accordance with 802.1Q
• Learning and forwarding according to MAC address and VID
• Learning of up to 1,024 MAC table entries (MAC + VID pairs)
• Configuration of the aging time
• MAC table viewing (learned MACs).
Ingress Process
The ingress process is composed of three steps:
• Frame Admission: Two modes of operation (configured per bridge):
 Admit All Frames: All frames arriving from the port are admitted and
proceed to the ingress filtering process. PVID is assigned to untagged or
priority only tagged frames.
 Admit Only VLAN Tagged Frames: Only VLAN tagged frames are admitted
and allowed to proceed to the ingress filtering process. Untagged or
priority-only tagged frames are discarded.
• Ingress Filtering: Works in one of the following modes (configured per bridge
port):
 Enable – Performs ingress filtering according to VIDs. Only frames that
share a VID assigned to this bridge port are admitted
 Disable – All frames are forwarded.
Only admitted frames that pass filtering are submitted to learning and
forwarding processes.
• PVID Assignment: Is per bridge port configuration:
In VLAN-Aware mode, each received frame entering the bridge is
associated with a single VID. In case the received frame does not contain
a VLAN ID (untagged or priority only tagged frames), a specific PVID is
assigned to these frames before they pass to the forwarding process.
Accordingly, the untagged/priority tagged frames that have passed the
admission/ingress filtering, are tagged with PVID and proceed to the
forwarding process. Tagged frames will be double tagged with the PVID
only if Tag Stacking is enabled.
For untagged frames that were tagged during this process to VID=PVID,
the priority tag is assigned at the VLAN priority field, according to the
default priority configuration.
Table 1-2 summarizes the behavior of the ingress process: