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Cabletron Systems TYPES OF VLANs, 1.2.1 802.1Q VLANs, SecureFast VLANs, Other VLAN Strategies

Models: 802.1Q

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Types of VLANs

1.2TYPES OF VLANs

There are a number of different strategies for creating Virtual Local Area Networks, each with their own approaches to deﬁning a station’s membership in a particular VLAN.

1.2.1802.1Q VLANs

An 802.1Q VLAN switch determines the VLAN membership of a data frame by its Tag Header, described later in this chapter. If the frame received is not tagged, the switch classiﬁes the frame into the VLAN that is assigned as the default VLAN of the switch.

Some or all ports on the switch may be conﬁgured to operate as GARP VLAN Registration Protocol (GVRP) ports. If a frame received is tagged, the frame is forwarded to the GVRP ports that are conﬁgured to transmit frames associated with the frame VLAN ID and protocol. If the received frame is not tagged, the frame is examined and tagged as belonging to the default VLAN. Then the frame is forwarded to the GVRP ports that are conﬁgured to transmit frames associated with the default VLAN and the frame protocol.

1.2.2SecureFast VLANs

Cabletron Systems’ SecureFast VLAN strategy takes a different approach to creating virtual LANs. In a SecureFast VLAN environment, the switches in the network recognize Network Layer routing requests and translate them. Based on this translation, the switches set up a connection between the end devices in the network.

1.2.3Other VLAN Strategies

VLANs may also be created by a variety of addressing schemes, including the recognition of groups of MAC addresses or types of trafﬁc. One of the best-known VLAN-like schemes is the use of IP Subnets to divide networks into smaller subnetworks.

802.1Q VLAN User’s Guide

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Cabletron Systems manual TYPES OF VLANs, 1.2.1 802.1Q VLANs, SecureFast VLANs, Other VLAN Strategies

Contents

9032599-02 802.1Q VLAN User’s GuidePage 802.1Q VLAN User’s Guide 802.1Q VLAN User’s Guide VIRTUAL LOCAL AREA NETWORKS CONTENTSPREFACE CHAPTER802.1Q VLAN User’s Guide ContentsVLAN CONFIGURATION CHAPTER802.1Q VLAN User’s Guide ContentsCHAPTER EXAMPLES802.1Q VLAN User’s Guide Contents802.1Q VLAN User’s Guide FIGURESviii TABLES802.1Q VLAN Configuration Menu Screen Menu Items 802.1Q VLAN User’s GuideUSING THIS GUIDE PREFACESTRUCTURE OF THIS GUIDE DOCUMENT CONVENTIONS RELATED DOCUMENTS1.1 DEFINING VLANs CHAPTER VIRTUAL LOCAL AREA NETWORKSBuilding Two Building One1.2.3 Other VLAN Strategies 1.2 TYPES OF VLANs1.2.1 802.1Q VLANs 1.2.2 SecureFast VLANs1.4 VLAN TERMS 1.3 BENEFITS AND RESTRICTIONSA data frame that does not have a Tag Header GARP Multicast Registration Protocol GMRP 1D TrunkGeneric Attribute Registration Protocol GARP GARP VLAN Registration Protocol GVRP1.5 GETTING HELP 802.1Q VLAN User’s Guide Chapter 1 Virtual Local Area NetworksCHAPTER VLAN OPERATION 2.1 DESCRIPTION2.2 VLAN COMPONENTS Chapter 2 VLAN Operation 2.3 CONFIGURATION PROCESS2.3.1 Deﬁning a VLAN 2.3.2 Classifying Frames to a VLAN2.3.3 Customizing the VLAN Forwarding List 2.4 VLAN SWITCH OPERATIONUntagged Frames 2.4.1 Receiving Frames from VLAN PortsTagged Frames 2.4.2 Forwarding Decisions2.4.2.1 Broadcasts, Multicasts, and Unknown Unicasts 2.4.2.2 Known Unicasts2.5 GARP SWITCH OPERATION 802.1Q Switch CHAPTER VLAN CONFIGURATION3.1 MANAGING THE SWITCH 3.1.1 Switch Without VLANs802.1Q Switch 3.1.2 Switch with VLANs2. Use the Port Assignment Configuration screen for the following 3.2.1 Preparing for VLAN Conﬁguration 3.2 SUMMARY OF VLAN LOCAL MANAGEMENTWhen to Use 3.3 802.1Q VLAN CONFIGURATION MENU SCREENHow to Access Screen ExampleFigure 3-4 802.1Q VLAN Conﬁguration Menu Screen Table 3-1 802.1Q VLAN Conﬁguration Menu Screen Menu Items Menu Deﬁnitions802.1Q VLAN Conﬁguration Menu Screen 802.1Q VLAN User’s GuideScreen Example 3.4 DEVICE VLAN CONFIGURATION SCREENWhen to Use How to AccessTable 3-2 Device VLAN Conﬁguration Screen Field Deﬁnitions Field DeﬁnitionsDevice VLAN Conﬁguration Screen 802.1Q VLAN User’s Guide3.4.1 Deﬁning a VLAN 3.4.3 Renaming a VLAN 3.4.2 Changing the VLAN to FID AssociationThe default VLAN cannot be deleted from the list 3.4.4 Deleting a VLAN3.4.5 Enabling VLANs 3.4.6 Disabling VLANs3.4.7 Changing the Forwarding Mode 3.4.8 Paging Through the VLAN ListThe default VLAN cannot be disabled Screen Example 3.5 PORT ASSIGNMENT CONFIGURATION SCREENWhen to Use How to AccessField Deﬁnitions 3.5.1 Changing the Port Mode3.5.2 Assigning a VLAN ID 3.6 PORT FILTERING CONFIGURATION SCREEN 3.5.3 Paging Through the Port ListWhen to Use 3-18 How to AccessScreen Example Chapter 3 VLAN ConﬁgurationField Deﬁnitions 3.6.1 Displaying VLAN IDs Associated with a Port3.6.2 Selecting the Type of Filtering for a Port Screen Example 3.7 VLAN FORWARDING CONFIGURATION SCREENWhen to Use How to Access3.7.1 Viewing Current VLAN Ports Field DeﬁnitionsSee the frame format Tagged or Untagged for the frames 3.7.2 Paging Through VLAN Forwarding List Entries 3.7.3 Adding Forwarding List Entries3.7.4 Deleting Forwarding List Entries 3.8 PROTOCOL VLAN CONFIGURATION SCREEN 3.7.5 Changing the Frame FormatWhen to Use 802.1Q VLAN User’s Guide How to AccessScreen Example Protocol VLAN Conﬁguration Screen802.1Q VLAN User’s Guide Field DeﬁnitionsChapter 3 VLAN Conﬁguration 3-26Table 3-6 Protocol VLAN Conﬁguration Screen Field Deﬁnitions Cont’d Protocol VLAN Conﬁguration Screen802.1Q VLAN User’s Guide 3-273.8.2 Assigning a Protocol Family to a VLAN ID 3.8.1 Displaying the Current Protocol, VLAN ID, and Port Assignments802.1Q VLAN User’s Guide Protocol VLAN Conﬁguration ScreenTo see if there are VLANs currently assigned to the Protocol TIP displayed in the Protocol ﬁeld, press ENTER3.8.3 Displaying the Protocol Types on Current Ports Screen Example 3.9 PROTOCOL PORTS CONFIGURATION SCREENWhen to Use How to Access802.1Q VLAN User’s Guide Field DeﬁnitionsChapter 3 VLAN Conﬁguration 3-323.10 QUICK VLAN WALKTHROUGH 3.9.1 Adding/Deleting Ports Associated with a VLAN ID6. Use the arrow keys to highlight the ADD/DEL field It is now time to assign a port to this new VLAN Figure 3-12 Walkthrough Stage Two Figure 3-13 Walkthrough Stage Three 17. Press the SPACE bar to toggle the field to display Enabled 21. Use the arrow keys to highlight the Port field Figure 3-15 Final Walkthrough Stage Chapter 3 VLAN Conﬁguration3-40 802.1Q VLAN User’s GuideR1 R2 R3 802.1Q Switch4.1 EXAMPLE 1, SINGLE SWITCH OPERATION CHAPTER EXAMPLES4.1.1 Solving the Problem 802.1Q SwitchB3 B2 B1 4.1.2 Frame Handling 4.2 EXAMPLE 2, VLANS ACROSS MULTIPLE SWITCHES Figure 4-3 Example 2, VLANs Across Multiple Switches 4.2.1 Solving the ProblemSwitch 4 is set as follows Switch 2 is set as follows Figure 4-4 Bridge 1 Broadcasts Frames 4.2.2 Frame HandlingFigure 4-5 Transmitting to Switch Figure 4-6 Transmitting to Bridge 4.3 EXAMPLE 3, 1D TRUNK CONNECTION TO 802.1Q VLAN NETWORKFigure 4-7 Example 3, 1D Trunk Connection to 802.1Q VLAN Network User BGreen Incorporated 4.3.1 Solving the Problem 4.3.2 Frame Handling Figure 4-8 Bridge 1 Broadcasts Frames Figure 4-10 Switch 1 Forwards to 1D Trunk Figure 4-9 Switch 2 Forwards to 1Q TrunkSwitch 1 checks the Filtering Database for the MAC address of User B. User B’s MAC address is located, and Port 2 is identified as User B’s location. The frame is then checked for eligibility and frame format for Port 2. Since Port 2 is a 1Q Trunk port, it is eligible to transmit frames for all VLANs. The frame is tagged and transmitted out Port 4.4 EXAMPLE 4, ISOLATING NETWORK TRAFFIC ACCORDING TO PROTOCOL Figure 4-11 Example 4, Isolating Trafﬁc According to Protocol 4.4.1 Solving the ProblemSwitch 3 is set as follows Switch 5 is set as follows Port 2, VLAN ID 6, Protocol AppleTalk Chapter 4 Examples 4-22802.1Q VLAN User’s Guide Numerics INDEXIndex Index-2802.1Q VLAN User’s Guide Index 802.1Q VLAN User’s GuideIndex-3 Index Index-4802.1Q VLAN User’s Guide