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Expansion Slots
MAC Address
Table
The switch features two expansion slots on the front panel. You can use
the slots to install optional expansion modules which you can use to
extend the distance of your network, build high-speed backbone
networks, and connect additional nodes to the network, such as high-
speed servers.
Note
For a list of the Allied Telesyn expansion modules supported by
your AT-9006 Gigabit Ethernet Switch and the AT-S26 management
software, refer to the Preface in the AT-S26 Management
Software User's Guide. This guide is available from the Allied
Telesyn web site.
The AT-9006 Series Switch contains a 12 K MAC address table. The switch
uses the table to store the MAC addresses of the network nodes
connected to its ports, along with the port number on which each
address was learned. The switch learns the MAC addresses by examining
the source address in each packet that enters a port, and adds the
address and port to the MAC table, assuming the address has not
already been entered in the table.
When the switch receives a packet, it examines the destination address
and, by referring to its MAC address table, can determine the port on
which the destination node is connected. It then forwards the packet to
the appropriate port and on to the end node. This increases network
bandwidth by limiting each frame to the appropriate port when the
intended end node is located, which frees the other switch ports for
receiving and transmitting data.
If the switch receives a packet with a destination address that is not in
the MAC address table, it floods the packet to all the ports on the switch.
If the ports have been grouped into virtual LANs, the switch floods the
packet only to those ports which belong to the same VLAN as the port
on which the packet was received. This prevents packets from being
forwarded onto inappropriate LAN segments, increasing network
security. When the destination node responds, the switch add its MAC
address and port number to the table.
If the switch receives a packet with a destination address that is on the
same port on which the packet was received, it filters the packet and
does not forward it on to any port. Since both the source node and the
destination node for the packet are located on the same port on the
switch, there is no reason for the switch to forward the packet.
AT-9006 Series Installation Guide
21
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