Allied Telesis AR450S Bedienungsanleitung PDF herunterladen (Seite 5)

Switching on the AR440S, AR441S and AR450S 3-5

Software Release 2.6.6

C613-03079-00 REV A

autonegotiating device connects to the switch port, they negotiate the highest

possible common speed and duplex mode.

It is also possible to require a switch port to operate at a single speed without

disabling autonegotiation by allowing the port to autonegotiate, but constrain

the speed/duplex options to the desired combination. For example, if one end

of a link is set to AUTO and other to 100MFULL then the AUTO end selects

100MHALF operation because without the other end autonegotiating the

AUTO end has no way of knowing that the fixed end is full duplex capable.

When a specific speed is required, it is usually better to fix the speed/duplex

combination using one of the autonegotiating speed values. Therefore, using

100MFAUTO at one end of a link and allows the AUTO end to autonegotiate

100MFULL.

If autonegotiation is disabled, the switch port is forced to operate at the

specified speed and duplex mode, regardless of whether the link partner is

capable of working at that speed.

Switch ports autonegotiate by default when they connect to a new device. To

change this setting, use the command:

SET SWITCH PORT={port-list|ALL} SPEED={AUTONEGOTIATE|10MHALF|

100MFAUTO} [other-options...]

To display the port speed and duplex mode settings, use the command:

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

Auto MDI/MDI-X (POLARITY parameter) is not affected by setting the port

speed and duplex mode.

Packet storm protection

The packet storm protection feature allows the user 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.

By default, packet storm protection is set to NONE, that is, disabled. Packet

storm protection can be enabled, and each of the limits set, using the command:

SET SWITCH PORT=port-list [BCLIMIT={NONE|limit}]

[DLFLIMIT={NONE|limit}] [MCLIMIT={NONE|limit}] [other-

options...]

Table 3-1: Switch Port Speed values.

Value Meaning

10MHALF 10 Mbps, half duplex, fixed, auto MDI/MDI-X

10MFULL 10 Mbps, full duplex, fixed, auto MDI/MDI-X

10MHAUTO 10 Mbps, half duplex, autonegotiate, auto MDI/MDI-X

10MFAUTO 10 Mbps, full duplex, autonegotiate, auto MDI/MDI-X-

100MHALF 100 Mbps, half duplex, fixed, auto MDI/MDI-X

100MFULL 100 Mbps, full duplex, fixed, auto MDI/MDI-X

100MHAUTO 100 Mbps, half duplex, autonegotiate, auto MDI/MDI-X

100MFAUTO 100 Mbps, full duplex, autonegotiate, auto MDI/MDI-X

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