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3Com 3CR17501-91 - SuperStack 3 Switch 3250 User Manual

3Com 3CR17501-91 - SuperStack 3 Switch 3250
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http://www.3com.com/
Part No. DUA1750-0BAA01
Published December 2003
SuperStack
®
3
Switch 3226 and Switch 3250
Implementation Guide
3CR17500-91
3CR17501-91

Table of Contents

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3Com 3CR17501-91 - SuperStack 3 Switch 3250 Specifications

General IconGeneral
Jumbo Frame SupportYes
Product TypeSwitch
Device TypeSwitch
Layer2
Form FactorRack-mountable
Status Indicatorspower
Compliant StandardsIEEE 802.3, IEEE 802.3u, IEEE 802.3ab
Operating Humidity10%
Standards ComplianceIEEE 802.3, IEEE 802.3u, IEEE 802.3ab, IEEE 802.3x
MAC Address Table Size8000 entries

Summary

About This Guide

Conventions

Lists conventions for notice icons and text formatting used throughout the guide.

Related Documentation

Lists other guides and resources available for the switch for further information.

Documentation Comments

Provides information on how to submit feedback to improve the documentation.

Switch Features Overview

What is Management Software?

Explains the role and benefits of using management software for switch configuration and monitoring.

Switch Features Explained

Introduces key switch features and their applications for optimizing network performance.

Aggregated Links

Details how multiple links combine for increased bandwidth and redundancy in network connections.

Auto-negotiation

Explains automatic negotiation for port speed, duplex mode, and flow control settings.

Configuration Save and Restore

Describes how to save and restore switch configuration files remotely to a server.

Multicast Filtering

Explains how to forward multicast traffic efficiently to specific endstations using IGMP snooping.

Rapid Spanning Tree Protocol

Details RSTP for network resilience against link failures and protection from network loops.

VLANs

Explains Virtual LANs for logical network segmentation, enhancing management and security.

Port Security

Details features for securing network ports based on MAC addresses or login authentication.

IP Routing

Explains IP routing as a method for distributing traffic across IP networks at Layer 3.

Optimizing Bandwidth

Duplex

Explains full and half duplex modes for data transmission efficiency and potential throughput.

Flow Control

Details flow control mechanisms to prevent packet loss during network congestion.

Aggregated Links

Details how multiple member links combine for increased bandwidth and redundancy.

How 802.3ad Link Aggregation Operates

Explains the IEEE 802.3ad standard and Link Aggregation Control Protocol (LACP).

Using Multicast Filtering

What is an IP Multicast?

Explains IP multicast for efficient one-to-many and many-to-many communication.

Multicast Filtering

Explains the process of forwarding multicast traffic only to registered endstations.

IGMP Multicast Filtering

Describes IGMP as a system for registering endstations with multicast groups.

Using Resilience Features

Rapid Spanning Tree Protocol

Explains RSTP for network resilience against link failure and protection from network loops.

What is STP?

Defines Spanning Tree Protocol (STP) and its role in path management.

How STP Works

Details how STP determines the most appropriate paths and blocks redundant ones.

How RSTP Differs to STP

Compares RSTP functionality and benefits over the legacy STP protocol.

Using the Switch Database

What is the Switch Database?

Explains the purpose and structure of the switch database for packet forwarding decisions.

Switch Database Entry States

Describes the different states (Learned, Non-aging, Permanent) of entries within the switch database.

Using Traffic Management

What is Traffic Prioritization?

Explains how to prioritize time-sensitive and critical data for smooth network transfer.

How Traffic Prioritization Works

Details classification methods (802.1D, DiffServ, IP Port) for prioritizing network traffic.

Status Monitoring and Statistics

What is RMON?

Defines RMON as an IETF standard for monitoring LAN/VLAN traffic and collecting statistics.

Alarms

Explains how the Alarms group sets thresholds and sampling intervals to generate events.

Events

Describes how the Events group creates logs and sends SNMP traps for RMON alarms.

Setting Up Virtual LANs

What are VLANs?

Defines Virtual LANs and their role in logical network segmentation, enhancing management and security.

Benefits of VLANs

Outlines benefits like ease of device movement, security, and traffic control.

VLANs and Your Switch

Explains support for VLANs using IEEE Std 802.1Q tagging for carrying traffic over single links.

Communication Between VLANs

Explains the need for routers or Layer 3 switches for inter-VLAN communication.

Using Automatic IP Configuration

How Your Switch Obtains IP Information

Describes automatic IP configuration via DHCP or manual IP configuration methods.

How Automatic IP Configuration Works

Explains the automatic IP configuration process using DHCP servers for network setup.

Making Your Network Secure

Limiting Management Access by IP Address

Details restricting management access to trusted IP addresses and specific network interfaces.

Securing Access to the Web Interface

Explains using HTTPS for secure, encrypted access to the switch's web interface.

Securing Access to the Command Line Interface

Explains using SSH for secure remote administration of the switch's command line interface.

Access Control Lists

Details ACLs for filtering traffic and limiting network access based on defined rules.

Port Security

Explains port security modes (Static, Network Login) for controlling access to network ports.

What is Network Login?

Defines Network Login for port-based user authentication typically via RADIUS.

Benefits of RADIUS Authentication

Outlines benefits of RADIUS for centralized, secure management login and administration.

IP Routing

What is Routing?

Defines routing as distributing packets across potentially dissimilar networks using routers.

What is IP Routing?

Defines IP routing as operating at the network layer (Layer 3) of the OSI model for packet delivery.

Benefits of IP Routing

Outlines benefits like economy, optimal routing, and network resiliency.

Routing Tables

Details how routers use routing tables to determine the best path for packet forwarding.

Layer 3 Switching

Explains how Layer 3 switching controls interaction between bridging and routing within a switch.

Implementing IP Routing

Outlines the necessary tasks for implementing IP routing, including VLANs and interfaces.

IP Routing Protocols

Discusses key protocols like RIP, UDP Helper, ARP, and ICMP for IP routing operations.

Configuration Rules

Configuration Rules for Gigabit Ethernet

Details media specifications and cabling requirements for Gigabit Ethernet connections.

Configuration Rules for Fast Ethernet

Explains topology rules and examples for setting up large-scale Fast Ethernet networks.

Configuration Rules with Full Duplex

Covers Ethernet topology rules specific to full duplex operation for enhanced throughput.

Network Configuration Examples

Desktop Switch Example

Shows switch usage for dedicated desktop connections using VLANs and aggregated links.

Edge Switch Example

Demonstrates a switch used as an edge switch with aggregation and Layer 3 switching for network optimization.

IP Addressing

IP Addresses

Explains the format and structure of IP addresses, including network and host parts.

Subnets and Subnet Masks

Details how to divide networks into subnets and the critical role of subnet masks.

Default Gateways

Explains the function of gateways for forwarding IP packets to remote network destinations.

Advanced IP Routing Concepts

Variable Length Subnet Masks (VLSMs)

Explains how VLSMs allow flexible subnetting for more efficient IP address space utilization.

Supernetting

Describes supernetting as a technique to reduce routing table size in large networks.

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