Port Trunking; Port Mirroring; Port Security - Allied Telesis AT-8700XL SERIES User Manual

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Resetting ports at the hardware level discards all frames queued for reception
or transmission on the port, and restarts autonegotiation of port speed and
duplex mode. Ports are reset using the command:
RESET SWITCH PORT={port-list|ALL} [COUNTER]
To display information about switch ports, use the command:
SHOW SWITCH PORT[={port-list|ALL}]
Autonegotiation of Port Speed and Duplex Mode
Each of the switch ports can operate at either 10 Mbps or 100 Mbps, in either
full duplex or half duplex mode. In full duplex mode a port can transmit and
receive data simultaneously, while in half duplex mode the port can either
transmit or receive, but not at the same time. This versatility makes it possible
to connect devices with different speeds and duplex modes to different ports
on the switch. Such versatility also requires that each port on the switch know
which speed and mode to use.

Port Trunking

Port trunking, also known as port bundling or link aggregation, allows a
number of ports to be configured to join together to make a single logical
connection of higher bandwidth. This can be used where a higher performance
link is required, and makes links even more reliable.
Packet Storm Protection
The packet storm protection feature allows you to set limits on the reception
rate of broadcast, multicast and destination lookup failure packets. The
software allows separate limits to be set for each port, beyond which each of
the different packet types are discarded. The software also allows separate
limits to be set for each of the packet types. Which of these options can be
implemented depends on the model of switch hardware.

Port Mirroring

Port mirroring allows traffic being received and transmitted on a switch port to
be sent to another switch port, the mirror port, usually for the purposes of
capturing the data with a protocol analyser. This mirror port is the only switch
port which belongs to no VLANs, and therefore does not participate in any
other switching. Before the mirror port can be set, it must be removed from all
VLANs except the default VLAN. The port cannot be part of a trunk group.

Port Security

The port security feature allows control over the stations connected to each
switch port, by MAC address. If enabled on a port, the switch will learn MAC
addresses up to a user-defined limit from 1 to 256, then lock out all other MAC
AT-8700XL Series Switch User Guide
Software Release 2.6.1
C613-02030-00 REV B