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Chapter 1 Introduction Installation and Operation Manual

1-12 Functional Description Egate-100 Ver. 4.0

Ingress Process

The ingress process is composed of three subprocesses: frame admission, ingress

filtering and PVID assignment to untagged/priority only tagged frames.

• Frame admission – has two modes of operation (configurable per bridge):

 Admit all frames – all frames arriving from the port are admitted and

proceed to the Ingress Filtering process.

 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 – configured per bridge, to one of the following modes:

 Enabled – perform ingress filtering according to VID. This means that only

frames that share a VID assigned to this bridge port are admitted

 Disabled – all frames are forwarded.

Only admitted frames that pass filtering are submitted to the learning and

forwarding processes.

Table

1-1

summarizes the behavior of the ingress

process.

Table

1-1. Ingress Process

Frame Admission

Mode

Ingress Filtering Mode Bridge Behavior

Admit all frames Enabled

VLAN-tagged frames with a VLAN ID (or PVID for

untagged/priority tagged frames) that do not include

the bridge port in their VLAN member set are dropped

Disabled All frames pass.

Admit VLAN-tagged

frames

Enabled

VLAN-tagged frames with a VLAN ID that do not

include the bridge port in their member set are

dropped. Untagged/priority-tagged frames are

dropped.

Disabled All VLAN-tagged frames pass.

Untagged/priority-tagged frames are dropped.

• PVID assignment – configurable per bridge port:

 In VLAN-aware mode, each received frame entering the bridge is

associated with a single VID. In cases where the received frame does not

contain a VLAN ID (i.e., untagged or priority-only tagged frames), a

specific PVID is assigned to the frame before it passes to the forwarding

process. This means that the untagged/priority tagged frames that have

passed the admission are tagged with PVID and proceed to the ingress

filtering process. Tagged frames are double-tagged with the PVID only if

tag stacking is enabled.

• Default priority tag – configurable per bridge port:

 In VLAN-aware mode, each received frame entering the bridge is

associated with a single VLAN ID and priority. In cases where the received

frame does not contain a VLAN ID (i.e., untagged frames), a specific PVID

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