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Installation and Operation Manual Chapter 1 Introduction

Egate-100 Ver. 4.0 Functional Description 1-13

and default priority tag are assigned to the frame before it passes to the

forwarding process. If tag stacking is enabled, the user can select the

priority according to the received priority tag or the default priority tag.

• Replace priority – configurable per bridge port:

 When stacking is disabled in VLAN-aware mode, each received frame that

enters the bridge is tagged with VLAN ID and priority. The original priority

can be replaced with the default priority tag when this parameter is set

to Yes.

• Copy origin priority – configurable per bridge port:

 When stacking is enabled in VLAN-aware mode, each received frame that

enters the bridge is tagged with VLAN ID and priority. When this

parameter is set to Yes, the original priority can be copied to the double

tag. When copy origin priority is set to No, the double tag is set with the

default priority tag.

• Strip VLAN tag – configurable for Gigabit Ethernet port:

 The VLAN tag of each received frame can be stripped at the Gigabit

Ethernet port ingress, before the frame enters the bridge. For

single-tagged ports, the frame enters the bridge with the user-defined

PVID and default priority.

Learning Process

The learning process observes the source MAC address (SA) and the VID of the

received frame, and updates the forwarding database with the MAC-VID pair and

with the bridge port that the frame was received from. The Forwarding Data Base

(FDB) is also referred to as the MAC table.

Entries in the MAC table can be dynamic (inserted by the learning process) or

static (inserted by configuration). A dynamic entry has an aging time associated

with it.

The Egate-100 VLAN-aware bridge is an Independent VLAN Learning (IVL) bridge.

The learning process inserts a new dynamic entry into the MAC table. This entry

consists of a MAC-VID pair and bridge port.

• If the MAC-VID pair already exists for the same port, the aging time is

updated

• If the MAC-VID pair already exists but for a different bridge port (dynamic

entry), the new entry overrides the existing one

• If the MAC-VID pair already exists for a different bridge port (static entry), the

static entry prevails.

Aging Process

The aging period for a table entry is the time since the last frame for this entry

entered the bridge.

The aging process checks the forwarding MAC table periodically. Each dynamic

entry for which the aging period has exceeded the configured Aging Time Limit is

deleted. The periodic check of the MAC table (aging time intervals) results in

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