Cabletron Systems 802.1Q manual Solving the Problem

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Chapter 4: Examples

4.3.1Solving the Problem

Much of the existing network conﬁguration can remain as it was for Example 2, VLANs Across Multiple Switches. However, the Forward Default VLAN Out All Ports must be set to YES on Switch 4 and 2, and a new 1Q Trunk port must be activated and conﬁgured on Switch 2. There are no other real changes to the network above the ﬁrst ﬂoor.

Switch 4

Switch 4 is set as follows:

1.The Forward Default VLAN Out All Ports is set to YES using the Device/VLAN Configuration screen. This adds the Default VLAN to the Port VLAN List of every switch port and all VLANs become members of FID 1. This allows all traffic received from the mail server via Switch 2 and Switch 1 to be received and classified to the Default VLAN of Switch 4.

Switch 2

Switch 2 is set as follows:

1.The Forward Default VLAN Out All Ports is set to YES using the Device/VLAN Configuration screen. This adds the Default VLAN to the Port VLAN List of every switch port and all VLANs become members of FID 1.

2.The port mode of Port 4 is set using the Port Assignment screen:

• Port 4, Port Mode: 1Q Trunk

This causes Port 4 to be set as an additional 802.1Q Trunk port, which makes its Port VLAN List contain all VLANs, and all frames forwarded out this port are forwarded as tagged frames.

Switch 1

Switch 1 needs to be added to the network backbone to handle trafﬁc from the Green Incorporated network and the mail server. To accomplish this Switch 1 is conﬁgured as follows:

1.One VLAN is added to the list of VLANs in the Device/VLAN Configuration screen. In this example, Switch 1 is set as follows:

• VLAN ID 4, FID 4, with a VLAN Name of Green

4-12	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 Using this Guide Structure of this GuideRelated Documents Document ConventionsChapter Virtual Local Area Networks Defining VLANsBuilding One Building Two SecureFast VLANs Types of VLANs1 802.1Q VLANs Other Vlan StrategiesBenefits and Restrictions Vlan TermsData frame that does not have a Tag Header 1D Trunk Getting Help Your email address802.1Q Vlan User’s Guide Description Vlan ComponentsConfiguration Process 1 Deﬁning a VlanClassifying Frames to a Vlan Vlan Switch Operation Customizing the Vlan Forwarding ListInside the Switch Receiving Frames from Vlan PortsForwarding Decisions Broadcasts, Multicasts, and Unknown UnicastsKnown Unicasts Garp Switch Operation Managing the Switch Switch Without VLANsSwitch with VLANs Switch Management with VLANsManaging the Switch Summary of Vlan Local Management Preparing for Vlan Conﬁguration802.1Q Vlan Configuration Menu Screen When to UseHow to Access Menu Deﬁnitions Device Vlan Configuration Screen Device Vlan Conﬁguration ScreenField Deﬁnitions 1 Deﬁning a Vlan Changing the Vlan to FID Association Renaming a VlanDeleting a Vlan Enabling VLANsDisabling VLANs Changing the Forwarding Mode Paging Through the Vlan ListPort Assignment Configuration Screen Port Assignment Conﬁguration ScreenChanging the Port Mode Port ModeAssigning a Vlan ID Port Filtering Configuration Screen Paging Through the Port ListPort Filtering Conﬁguration Screen Displaying Vlan IDs Associated with a Port Vlan ListsSelecting the Type of Filtering for a Port Vlan Forwarding Configuration Screen Vlan Forwarding Conﬁguration ScreenViewing Current Vlan Ports Frame FormatPaging Through Vlan Forwarding List Entries Adding Forwarding List EntriesDeleting Forwarding List Entries Protocol Vlan Configuration Screen Changing the Frame FormatProtocol Vlan Conﬁguration Screen Selectable Feature Status Assigning a Protocol Family to a Vlan ID Ether typeProtocol Vlan Conﬁguration Screen Displaying the Protocol Types on Current Ports Protocol Ports Configuration Screen 10 Protocol Ports Conﬁguration ScreenDelete ALL Adding/Deleting Ports Associated with a Vlan ID Quick Vlan Walkthrough802.1Q Vlan User’s Guide Hybrid 12 Walkthrough Stage Two 13 Walkthrough Stage Three 14 Walkthrough Stage Four Quick Vlan Walkthrough 15 Final Walkthrough Stage Example 1, Single Switch Operation Chapter ExamplesSolving the Problem Switch Conﬁgured for VLANsFrame 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 Example 3, 1D Trunk Connection to 802.1Q Vlan Network Transmitting to BridgeExample 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 Index NumericsIndex-2 802.1Q Vlan User’s Guide 802.1Q Vlan User’s Guide Index-3 Index Index-4 802.1Q Vlan User’s Guide