Specifications

Installation and Operation Manual Chapter 1 Introduction
RICi-4E1/T1, RICi-8E1/T1 Ver. 2.0 Functional Description 1-9
Ingress Process
The ingress process is composed of three steps: frame admission, ingress
filtering and PVID assignment to untagged/priority-only tagged frames.
• 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. One of the following modes, configured per bridge port:
 Enable. Perform ingress filtering according to VID. This means that 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. Per bridge port configuration.
In VLAN-aware mode, each received frame entering the bridge is
associated with a single VID. If 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.
This means that 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 1-1 summarizes the behavior of the ingress process.