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Chapter 5
Layer 2 Switching
This section describes the Layer 2 switching features on the AT-8800 Series
Switch, and how to configure them.
Switch Ports
Each Ethernet switch port is uniquely identified by a port number. The switch
supports a number of features at the physical level that allow it to be connected
in a variety of physical networks. This physical layer (layer 1) versatility
includes:
■ Enabling and disabling of Ethernet ports.
■ Auto negotiation of port speed and duplex mode for all 10/100 Ethernet
ports.
■ Manual setting of port speed and duplex mode for all 10/100 Ethernet
ports.
■ Link up and link down triggers.
■ Port trunking.
■ Packet storm protection.
■ Port mirroring.
■ Support for SNMP management
Enabling and Disabling Switch Ports
An switch port that is enabled is available for packet reception and
transmission. Its administrative status in the Interfaces MIB is UP. Conversely,
an Ethernet port that is disabled is not available for packet reception and
transmission. It will not send or receive any frames; incoming STP BPDU
packets are discarded. Its administrative status in the Interfaces MIB is DOWN.
Every Ethernet port on the switch is enabled by default. Disabling a switch
port does not affect the STP operation on the port. Enabling a switch port will
allow the port to participate in spanning tree negotiation. A switch port that
has been disabled by the Port Security feature cannot be enabled using the
ENABLE SWITCH PORT command.