User`s guide
Table Of Contents
- Title
 - Notice
 - Contents
 - Figures
 - Tables
 - About This Guide
 - Introduction
 - Local Management Requirements
 - Accessing Local Management
- 3.1 Navigating Local Management Screens
 - 3.2 Password Screen
 - 3.3 Main Menu Screen
 - 3.4 Module Selection Screen
 - 3.5 Module Menu Screen
 - 3.6 Overview of Security Methods
 - 3.7 Security Menu Screen
 - 3.8 Passwords Screen
 - 3.9 Radius Configuration Screen
 - 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
 - 4.5 SNMP Traps Configuration Screen
 - 4.6 Chassis Environmental Information Screen
 - 4.7 Redirect Configuration Menu Screen (Chassis)
 - 4.8 Port Redirect Configuration Screen
 - 4.9 VLAN Redirect Configuration Screen
 
 - Module Configuration Menu Screens
- 5.1 Module Configuration Menu Screen
 - 5.2 General Configuration Screen
- 5.2.1 Setting the IP Address
 - 5.2.2 Setting the Subnet Mask
 - 5.2.3 Setting the Default Gateway
 - 5.2.4 Setting the TFTP Gateway IP Address
 - 5.2.5 Setting the Module Name
 - 5.2.6 Setting the Module Date
 - 5.2.7 Setting the Module Time
 - 5.2.8 Entering a New Screen Refresh Time
 - 5.2.9 Setting the Screen Lockout Time
 - 5.2.10 Configuring the COM Port
 - 5.2.11 Clearing NVRAM
 - 5.2.12 Enabling/Disabling IP Fragmentation
 
 - 5.3 SNMP Configuration Menu Screen
 - 5.4 SNMP Community Names Configuration Screen
 - 5.5 SNMP Traps Configuration Screen
 - 5.6 Access Control List Screen
 - 5.7 System Resources Information Screen
 - 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
 - 6.4 HSIM/VHSIM Configuration Screen
 - 6.5 Redirect Configuration Menu Screen
 - 6.6 Port Redirect Configuration Screen
 - 6.7 VLAN Redirect Configuration Screen
 - 6.8 Link Aggregation Screen (802.3ad Main Menu Screen)
 - 6.9 Broadcast Suppression Configuration Screen
 
 - 802.1 Configuration Menu Screens
 - 802.1Q VLAN Configuration Menu Screens
- 8.1 Summary of VLAN Local Management
 - 8.2 802.1Q VLAN Configuration Menu Screen
 - 8.3 Static VLAN Configuration Screen
 - 8.4 Static VLAN Egress Configuration Screen
 - 8.5 Current VLAN Configuration Screen
 - 8.6 Current VLAN Egress Configuration Screen
 - 8.7 VLAN Port Configuration Screen
 - 8.8 VLAN Classification Configuration Screen
 - 8.9 Protocol Port Configuration Screen
 
 - 802.1p Configuration Menu Screens
- 9.1 802.1p Configuration Menu Screen
 - 9.2 Port Priority Configuration Screen
 - 9.3 Traffic Class Information Screen
 - 9.4 Traffic Class Configuration Screen
 - 9.5 Transmit Queues Configuration Screen
 - 9.6 Priority Classification Configuration Screen
 - 9.7 Protocol Port Configuration Screen
 - 9.8 Rate Limiting Configuration Screen
 
 - Layer 3 Extensions Menu Screens
 - Module Statistics Menu Screens
 - Network Tools Screens
 - VLAN Operation and Network Applications
- 13.1 Defining VLANs
 - 13.2 Types of VLANs
 - 13.3 Benefits and Restrictions
 - 13.4 VLAN Terms
 - 13.5 VLAN Operation
 - 13.6 Configuration Process
 - 13.7 VLAN Switch Operation
 - 13.8 VLAN Configuration
 - 13.9 Summary of VLAN Local Management
 - 13.10 Quick VLAN Walkthrough
 - 13.11 Examples
 - 13.12 Example 1, Single Switch Operation
 - 13.13 Example 2, VLANs Across Multiple Switches
 - 13.14 Example 3, Filtering Traffic According to a Layer 4 Classification Rule
 - 13.15 Example 4, Securing Sensitive Information According to Subnet
 - 13.16 Example 5, Using Dynamic Egress to Control Traffic
 - 13.17 Example 6, Locking a MAC Address to a Port Using Classification Rules
 
 - Generic Attribute Registration Protocol (GARP)
 - About IGMP
 - Index
 

How It Works
A-2 Generic Attribute Registration Protocol (GARP)
A.2 HOW IT WORKS
In Figure A-1, Switch 4, port 1 is registered as being a member of VLAN Blue and then declares 
this fact out all its ports (2 and 3) to Switch 1 and Switch 2. These two switches register this in the 
Port VLAN Lists of the ports (Switch 1, port 1 and Switch 2, port 1) that received the frames with 
the information. Switch 2, which is connected to Switch 3 and Switch 5 declares the same 
information to those two switches and the Port VLAN List of each port is updated with the new 
information, accordingly.
Figure A-1 Example of VLAN Propagation via GVRP
Configuring a VLAN on an 802.1Q switch creates a static GVRP entry. The entry will always 
remain registered and will not time out. However, dynamic entries will time-out and their 
registrations are removed from the member list if the end station A is removed. This ensures that if 
switches are disconnected, or if end stations are removed, the registered information remains 
accurate.
The end result is that the Port VLAN List of a port is updated with information about VLANs that 
reside off that port, even if the actual station on the VLAN is several hops away.
D
End
Station A
Switch 1 Switch 2
Switch 3
Switch 4 Switch 5
R
R
R
R
D
D
D
 = Port registered as a member of VLAN Blue
 = Port declaring VLAN Blue
D
R
2599_19
1
1
1
1
1
2
2
3
3
R










