User`s guide

ManualsBrandsEnterasys ManualsComputer equipmentVHSIM2-A6DP

381

382

383

384

385

386

387

388

389

390

Table Of Contents

Title
Notice
Contents
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- A
- B
Figures
Tables
About This Guide
- Using This Guide
- Structure of This Guide
- Related Documents
- Document Conventions
- Typographical and Keystroke Conventions
Introduction
- 1.1 Overview
  - 1.1.1 The Management Agent
  - 1.1.2 In-Band vs. Out-of-Band
- 1.2 Navigating Local Management Screens
- 1.3 Local Management Requirements
- 1.4 Local Management Screen Elements
- 1.5 Local Management Keyboard Conventions
- 1.6 Getting Help
Local Management Requirements
- 2.1 Management Terminal Setup
  - 2.1.1 Console Cable Connection
  - 2.1.2 Management Terminal Setup Parameters
- 2.2 Telnet Connections
- 2.3 Monitoring an Uninterruptible Power Supply
Accessing Local Management
- 3.1 Navigating Local Management Screens
- 3.2 Password Screen
- 3.3 Main Menu Screen
- 3.4 Module Selection Screen
  - 3.4.1 Selecting a Module
- 3.5 Module Menu Screen
- 3.6 Overview of Security Methods
- 3.7 Security Menu Screen
- 3.8 Passwords Screen
  - 3.8.1 Setting the Module Login Password
- 3.9 Radius Configuration Screen
  - 3.9.1 Setting the Last Resort Authentication
  - 3.9.2 Setting the Local and Remote Servers
- 3.10 Name Services Configuration Screen
- 3.11 System Authentication Configuration Screen
- 3.12 EAP (Port) Configuration Screen
- 3.13 EAP Statistics Menu Screen
- 3.14 MAC Port Configuration Screen
- 3.15 MAC Supplicant Configuration Screen
Chassis Menu Screens
- 4.1 Chassis Menu Screen
- 4.2 Chassis Configuration Screen
- 4.3 SNMP Configuration Menu Screen
- 4.4 SNMP Community Names Configuration Screen
  - 4.4.1 Establishing Community Names
- 4.5 SNMP Traps Configuration Screen
  - 4.5.1 Configuring the Trap Table
- 4.6 Chassis Environmental Information Screen
- 4.7 Redirect Configuration Menu Screen (Chassis)
- 4.8 Port Redirect Configuration Screen
  - 4.8.1 Changing Source and Destination Ports
- 4.9 VLAN Redirect Configuration Screen
  - 4.9.1 Changing Source VLAN and Destination Ports
Module Configuration Menu Screens
- 5.1 Module Configuration Menu Screen
- 5.2 General Configuration Screen
- 5.3 SNMP Configuration Menu Screen
- 5.4 SNMP Community Names Configuration Screen
  - 5.4.1 Establishing Community Names
- 5.5 SNMP Traps Configuration Screen
  - 5.5.1 Configuring the Trap Table
- 5.6 Access Control List Screen
  - 5.6.1 Entering IP Addresses
  - 5.6.2 Enable/Disable ACL
- 5.7 System Resources Information Screen
  - 5.7.1 Setting the Reset Peak Switch Utilization
- 5.8 FLASH Download Configuration Screen
Port Configuration Menu Screens
- 6.1 Port Configuration Menu Screen
- 6.2 Ethernet Interface Configuration Screen
- 6.3 Ethernet Port Configuration Screen
  - 6.3.1 Selecting Field Settings
  - 6.3.2 Setting the Advertised Ability
- 6.4 HSIM/VHSIM Configuration Screen
- 6.5 Redirect Configuration Menu Screen
- 6.6 Port Redirect Configuration Screen
  - 6.6.1 Changing Source and Destination Ports
- 6.7 VLAN Redirect Configuration Screen
  - 6.7.1 Changing Source VLAN and Destination Ports
- 6.8 Link Aggregation Screen (802.3ad Main Menu Screen)
- 6.9 Broadcast Suppression Configuration Screen
  - 6.9.1 Setting the Threshold
  - 6.9.2 Setting the Reset Peak
802.1 Configuration Menu Screens
- 7.1 802.1 Configuration Menu Screen
- 7.2 Spanning Tree Configuration Menu Screen
- 7.3 Spanning Tree Configuration Screen
  - 7.3.1 Configuring a VLAN Spanning Tree
- 7.4 Spanning Tree Port Configuration Screen
  - 7.4.1 Enabling/Disabling the Default Spanning Tree Ports
  - 7.4.2 Viewing Status of Spanning Tree Ports
- 7.5 PVST Port Configuration Screen
802.1Q VLAN Configuration Menu Screens
- 8.1 Summary of VLAN Local Management
  - 8.1.1 Preparing for VLAN Configuration
- 8.2 802.1Q VLAN Configuration Menu Screen
- 8.3 Static VLAN Configuration Screen
- 8.4 Static VLAN Egress Configuration Screen
  - 8.4.1 Setting Egress Types on Ports
  - 8.4.2 Displaying the Next Group of Ports
- 8.5 Current VLAN Configuration Screen
- 8.6 Current VLAN Egress Configuration Screen
- 8.7 VLAN Port Configuration Screen
  - 8.7.1 Changing the Port Mode
  - 8.7.2 Configuring the VLAN Ports
- 8.8 VLAN Classification Configuration Screen
- 8.9 Protocol Port Configuration Screen
  - 8.9.1 Assigning Ports to a VID/Classification
802.1p Configuration Menu Screens
- 9.1 802.1p Configuration Menu Screen
- 9.2 Port Priority Configuration Screen
  - 9.2.1 Setting Switch Port Priority Port-by-Port
  - 9.2.2 Setting Switch Port Priority on All Ports
- 9.3 Traffic Class Information Screen
- 9.4 Traffic Class Configuration Screen
  - 9.4.1 Assigning the Traffic Class to Port Priority
- 9.5 Transmit Queues Configuration Screen
  - 9.5.1 Setting the Current Queueing Mode
- 9.6 Priority Classification Configuration Screen
- 9.7 Protocol Port Configuration Screen
  - 9.7.1 Assigning Ports to a PID/Classification
  - 9.7.2 Example, Prioritizing Traffic According to Classification Rule
    - 9.7.2.1 Solving the Problem
- 9.8 Rate Limiting Configuration Screen
Layer 3 Extensions Menu Screens
- 10.1 Layer 3 Extensions Menu Screen
- 10.2 IGMP/VLAN Configuration Screen
  - 10.2.1 IGMP/VLAN Configuration Procedure
Module Statistics Menu Screens
- 11.1 Module Statistics Menu Screen
- 11.2 Switch Statistics Screen
- 11.3 Interface Statistics Screen
  - 11.3.1 Displaying Interface Statistics
- 11.4 RMON Statistics Screen
  - 11.4.1 Displaying RMON Statistics
- 11.5 Chassis Environmental Statistics Configuration Screen
Network Tools Screens
- 12.1 Network Tools
- 12.2 Built-in Commands
- 12.3 Example, Effects of Aging Time on Dynamic Egress
- 12.4 Example, Using Dynamic Egress to Control Traffic
- 12.5 Special Commands
VLAN Operation and Network Applications
- 13.1 Defining VLANs
- 13.2 Types of VLANs
  - 13.2.1 802.1Q VLANs
  - 13.2.2 Other VLAN Strategies
- 13.3 Benefits and Restrictions
- 13.4 VLAN Terms
- 13.5 VLAN Operation
  - 13.5.1 Description
  - 13.5.2 VLAN Components
- 13.6 Configuration Process
- 13.7 VLAN Switch Operation
  - 13.7.1 Receiving Frames from VLAN Ports
  - 13.7.2 Forwarding Decisions
    - 13.7.2.1 Broadcasts, Multicasts, and Unknown Unicasts
    - 13.7.2.2 Known Unicasts
- 13.8 VLAN Configuration
- 13.9 Summary of VLAN Local Management
  - 13.9.1 Preparing for VLAN Configuration
- 13.10 Quick VLAN Walkthrough
- 13.11 Examples
- 13.12 Example 1, Single Switch Operation
  - 13.12.1 Solving the Problem
  - 13.12.2 Frame Handling
- 13.13 Example 2, VLANs Across Multiple Switches
  - 13.13.1 Solving the Problem
  - 13.13.2 Frame Handling
- 13.14 Example 3, Filtering Traffic According to a Layer 4 Classification Rule
  - 13.14.1 Solving the Problem
- 13.15 Example 4, Securing Sensitive Information According to Subnet
  - 13.15.1 Solving the Problem
- 13.16 Example 5, Using Dynamic Egress to Control Traffic
- 13.17 Example 6, Locking a MAC Address to a Port Using Classification Rules
  - 13.17.1 Solving the Problem
Generic Attribute Registration Protocol (GARP)
- A.1 Operation
- A.2 How It Works
About IGMP
- B.1 IGMP Overview
- B.2 Supported Features and Functions
- B.3 Detecting Multicast Routers
Index
- Numerics
- A
- B
- C
- D
- E
- F
- G
- H
- I
- K
- L
- M
- N
- P
- Q
- R
- S
- T
- U
- V
- W

VLAN Switch Operation

VLAN Operation and Network Applications 13-9

13.7 VLAN SWITCH OPERATION

IEEE 802.1Q VLAN switches act on the classification of frames into VLANs. Sometimes, VLAN

classification is based on tags in the headers of data frames. These VLAN tags are added to data

frames by the switch as the frames are transmitted out certain ports, and are later used to make

forwarding decisions by the switch and other VLAN-aware switches. In the absence of a VLAN

tag header, the classification of a frame into a particular VLAN depends upon the configuration of

the switch port that received the frame.

The operation of an 802.1Q VLAN switch is best understood from a point of view of the switch

itself. To illustrate this concept, the examples that follow view the switch operations from inside

the switch.

Figure 13-2 depicts the inside of a switch with six ports, numbered one through six. The switch has

been configured to associate VLAN A and B with Filtering Database Identifier (FDB ID) 2,

VLAN C and D with FDB ID 3, and VLAN E with FDB ID 4. Port 6 has been classified to serve

as a VLAN trunk connection (will only transmit and receive tagged frames). This classification

establishes that all VLANs are members of the Port VLAN List for Port 6 and the frames

transmitted for all VLANs will contain a tag header. Also the PVID for Port 6 is set to the default

VLAN with its corresponding relationship to FDB ID 1. Although untagged frames are not usually

present on a VLAN trunk connection, any untagged frames received would need to be classified if

the port has not been configured to drop all untagged frames.

Figure 13-2 View from Inside the Switch

NOTE: The example in Figure 13-2 shows ports sharing the same FDB ID, which is

supported by the switch. However, this feature cannot be configured using Local

Management at this time, but it can be configured using an SNMP management

application.

Port 4

FID 3

2599-02

Port 3

FID 3

Port 6

Port 2

FID 2

Port 1

FID 2

Default

FID 1

Port 5

FID 4