Chapter
1 Introduction
Installation and Operation Manual
1-26 Functional
Description
ACE-3105, ACE-3205 Ver. 5.2
•
Ingress tag stacking – per user configuration, a VLAN tag can be added to
incoming frames. The VLAN tag stacking is performed upon entering the
bridge, while the bridge forwarding decision is made according to this VLAN
tag.
The VID of the stacked VLAN tag is the configured port VID of the bridge port.
Management traffic over Ethernet in the receive direction is passed to the host
through the bridge. For more information about how to enable management over
bridge, refer to
Chapter 4
.
MAC Table Handling in Bridge Mode
The bridge supports learned MAC addresses. Since the VLAN-aware bridge works
in IVL mode, the MAC table consists of MAC add VIDs. The maximum
number of MAC addresses kept in the MAC table is 512.
ACE-3105, ACE-3205 allows configuring the maximal number of learned MAC
addresses per bridge port. New MAC addresses received by the bridge are
transferred to the host through a dedicated learning queue. The host samples
this queue and configures the bridge accordingly.
Unused learned MAC addresses are deleted from the MAC table in the MAC aging
process. A MAC address is regarded unused if no frames from that address were
received for a specified period of time. This time is the ‘aging time’ configurable
parameter.
Frames Handling in Bridge Mode
The bridge treats multicast frames as broadcast frames. Multicast frames are
flooded to all bridge ports that belong to the VID of a multicast frame.
The bridge handles all received frames on an Ethernet port except PW frames.
The following flowchart illustrates the possible paths for a frame that is received
on the Ethernet port:
Note
