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Installation and Operation Manual Chapter 1 Introduction
Egate-100 Ver. 4.0 Functional Description 1-11
Bridge
Egate-100 has a multiport bridge with up to two Ethernet bridge ports and up to
130 bridge ports over the CH-STM-1/OC-3 interface. The bridge supports two
modes of operation: VLAN-aware and VLAN-unaware.
VLAN-Aware Mode
This mode enables creation of su/jointfilesconvert/371155/bgroups of bridge ports within the bridge. Each
su/jointfilesconvert/371155/bgroup is defined per VLAN and is associated with a unique VLAN ID. Frames
with a specific VLAN ID can be forwarded only between bridge ports that are
members of the same VLAN, thus enabling a total separation between different
VLAN users within the same bridge.
The bridge features in VLAN-aware mode are:
Full VLAN-aware bridge as per 802.1Q
VLAN tag options:
Option for VLAN tag stacking (“double VLAN”) at bridge port ingress
Option for VLAN tag stacking (“double VLAN”) at bridge port egress
Option to copy/set VLAN priority tag at port ingress
Option for VLAN tag stripping at port egress
Option for VLAN tag stripping at bridge port ingress.
Learning and forwarding according to MAC address and VID
Learning of up to 64,000 MAC table entries (MAC-VID pairs)
Up to 1024 VLANs supported (out of the full VLAN range)
MAC learning limit – can be configured for each bridge port
Aging time – can be configured at the bridge level
MAC table viewing (learned MACs)
Optional loop detection
Ethernet OAM (802.3ah).
The mechanism of the VLAN-aware bridge can be described as five different
processes:
Ingress – checks each frame entering the bridge to decide if and how this
frame should be passed on to the forwarding process
Learning – learns new MAC table entries (MAC only or MAC-VID pairs)
Aging – checks the forwarding MAC table periodically
Forwarding – decides to which bridge port/ports to forward the frame
Egress – selects the format of the transmitted frame at the output port, with
or without VLAN.
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