3com DUA1770-0AAA04 User Manual

HAPTER

1: I

NTRODUCING

THE

UPER

TACK

3 S

WITCH

4900 S

ERIES

Console Port

The console port allows you to connect a terminal and perform remote or
local out-of-band management. The console port uses a standard null
modem cable and is set to auto-baud (up to a maximum of 19200 baud),
8 data bits, no parity and 1 stop bit.

Expansion Module

Slot

You can use this slot to install an Expansion Module. Contact your
supplier for further information on the range of Expansion Modules
supported by your Switch.

WARNING:

When an Expansion Module is not installed, ensure the

blanking plate is fitted by tightening all screws with a suitable tool.

Default Settings

Table 5

shows the default settings for the Switches. If you initialize one of

the Switch units, it is returned to these defaults.

Table 5 Default Setting

Feature

Switch 4900 Series

Port Status

Enabled

Port Speed

Auto-negotiated

Duplex Mode

Auto-negotiated

Flow Control

Auto-negotiated

Broadcast Storm Control

Enabled

High threshold: 3000 broadcast frames per
second — Notify and filter

Low threshold: 1500 broadcast frames per
second — Notify and unfilter

Virtual LANs (VLANs)

All ports belong to the untagged Default VLAN
(VLAN 1)

Multicast Filtering

IGMP filtering enabled

Rapid Spanning Tree Protocol

Enabled

Link Aggregation Control
Protocol (LACP)

Enabled

Smart Auto-sensing

Switch 4900, 4924, and 4950: Enabled
Switch 4900 SX: Not applicable

IP Address

169.254.100.100

* This default IP address is used if the unit is operating in standalone mode, and/or no other

Switches on the network have this IP address. If this default IP address is already in use then the
Switch detects this and configures itself with an IP address in the range 169.254.1.0 to
169.254.254.255.

Subnet Mask

255.255.0.0