Cabletron Systems Types of VLANs, 1 802.1Q VLANs, SecureFast VLANs, Other Vlan Strategies

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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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Contents 802.1Q Vlan User’s Guide Page 802.1Q Vlan User’s Guide 802.1Q Vlan User’s Guide Contents Contents Contents Contents 802.1Q Vlan User’s Guide Figures Tables Structure of this Guide Using this GuideDocument Conventions Related DocumentsDefining VLANs Chapter Virtual Local Area NetworksBuilding One Building Two Other Vlan Strategies Types of VLANs1 802.1Q VLANs SecureFast VLANsVlan Terms Benefits and RestrictionsData frame that does not have a Tag Header 1D Trunk Your email address Getting Help802.1Q Vlan User’s Guide Vlan Components DescriptionConfiguration Process 1 Deﬁning a VlanClassifying Frames to a Vlan Customizing the Vlan Forwarding List Vlan Switch OperationReceiving Frames from Vlan Ports Inside the SwitchForwarding Decisions Broadcasts, Multicasts, and Unknown UnicastsKnown Unicasts Garp Switch Operation Switch Without VLANs Managing the SwitchSwitch Management with VLANs Switch with VLANsManaging the Switch Preparing for Vlan Conﬁguration Summary of Vlan Local ManagementWhen to Use 802.1Q Vlan Configuration Menu ScreenHow to Access Menu Deﬁnitions Device Vlan Conﬁguration Screen Device Vlan Configuration ScreenField Deﬁnitions 1 Deﬁning a Vlan Renaming a Vlan Changing the Vlan to FID AssociationDeleting a Vlan Enabling VLANsDisabling VLANs Paging Through the Vlan List Changing the Forwarding ModePort Assignment Conﬁguration Screen Port Assignment Configuration ScreenPort Mode Changing the Port ModeAssigning a Vlan ID Paging Through the Port List Port Filtering Configuration ScreenPort Filtering Conﬁguration Screen Vlan Lists Displaying Vlan IDs Associated with a PortSelecting the Type of Filtering for a Port Vlan Forwarding Conﬁguration Screen Vlan Forwarding Configuration ScreenFrame Format Viewing Current Vlan PortsPaging Through Vlan Forwarding List Entries Adding Forwarding List EntriesDeleting Forwarding List Entries Changing the Frame Format Protocol Vlan Configuration ScreenProtocol Vlan Conﬁguration Screen Selectable Feature Status Ether type Assigning a Protocol Family to a Vlan IDProtocol Vlan Conﬁguration Screen Displaying the Protocol Types on Current Ports 10 Protocol Ports Conﬁguration Screen Protocol Ports Configuration ScreenDelete ALL Quick Vlan Walkthrough Adding/Deleting Ports Associated with a Vlan ID802.1Q Vlan User’s Guide Hybrid 12 Walkthrough Stage Two 13 Walkthrough Stage Three 14 Walkthrough Stage Four Quick Vlan Walkthrough 15 Final Walkthrough Stage Chapter Examples Example 1, Single Switch OperationSwitch Conﬁgured for VLANs Solving the ProblemFrame Handling Example 2, Vlans Across Multiple Switches Example 2, VLANs Across Multiple Switches Switch Example 2, VLANs Across Multiple Switches Bridge 1 Broadcasts Frames Transmitting to Switch Transmitting to Bridge Example 3, 1D Trunk Connection to 802.1Q Vlan NetworkExample 3, 1D Trunk Connection to 802.1Q Vlan Network Solving the Problem Frame Handling 226318 Switch 2 Forwards to 1Q Trunk Examples Example 4, Isolating Network Traffic According to Protocol 11 Example 4, Isolating Trafﬁc According to Protocol Switch Examples Example 4, Isolating Network Trafﬁc According to Protocol Examples 802.1Q Vlan User’s Guide Numerics IndexIndex-2 802.1Q Vlan User’s Guide 802.1Q Vlan User’s Guide Index-3 Index Index-4 802.1Q Vlan User’s Guide