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3-4 AR400 Series Router Software Reference

Software Release 2.6.6

C613-03079-00 REV A

Switch Ports

A switch port is one of the physical Ethernet interfaces on the base router unit.

Each switch port is uniquely identified by a port number. The router 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.

■ Autonegotiation 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.

■ Packet storm protection.

■ Support for SNMP management.

Enabling and disabling switch ports

A switch port that is enabled is available for packet reception and transmission.

The administrative status of the switch port in the Interfaces MIB is UP.

Conversely, a port that is disabled is not available for packet reception and

transmission. The port does not send or receive packets and the administrative

status in the Interfaces MIB is DOWN. Every switch port is enabled by default.

To enable or disable a switch port, use the commands:

ENABLE SWITCH PORT={port-list|ALL}

DISABLE SWITCH PORT={port-list|ALL}

To reset the switch module, which resets all switch ports, clear dynamic switch

information and reset counters and timers to zero, use the command:

RESET SWITCH

To display information about switch ports, use the command:

SHOW SWITCH PORT[={port-list|ALL}]

Autonegotiation of port speed and duplex mode

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. In half duplex mode a port can either transmit or receive data,

but not at the same time. This versatility makes it possible to connect devices

with different speeds and duplex modes to different switch ports. Such

versatility also requires that each switch port knows which speed and mode to

use.

Each switch port can be configured with a fixed speed and duplex mode. Or

switch ports can be configured to autonegotiate speed and duplex mode with a

device connected to it that determines a speed and mode for successful

transmission. Switch port speed and duplex modes are shown in Table 3-1 on

page 3-5. Setting the switch port to a fixed speed and duplex mode lets the port

support equipment that cannot autonegotiate. Autonegotiation permits switch

ports to adjust their speed and duplex mode to accommodate devices

connected to them. An autonegotiating switch port adopts the speed and

duplex mode required by devices connected to it. When another

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