Cabletron Systems 802.1Q manual 226318

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Chapter 4: Examples

2.Switch 4 receives the frame and classifies this new untagged frame as belonging to the Red VLAN. Since the frame is a broadcast, it is forwarded to any ports that are classified as eligible to receive Red VLAN frames. Switch 4 also updates its Source Address Table for FID 1, identifying User B as being located out Port 1.

On Switch 4, the only port eligible to receive Red VLAN frames is Port 4, the 1Q Trunk. The frame is forwarded out Port 4 with the Red VLAN Tag header being added, as shown in Figure 4-8.

User B

Bridge 1		2
Bridge 1
Red VLAN	1	4 3
		4

Bridge 2

Blue VLAN

Floor 4

2263_18

Figure 4-8 Bridge 1 Broadcasts Frames

3.Switch 2 receives the tagged Red VLAN frame on Port 2, as shown in Figure 4-9. The VLAN Tag in the frame is maintained, classifying the frame as belonging to the Red VLAN. The switch forwards the broadcast frame out all the eligible ports, Ports 3 and 4. Switch 2 simultaneously updates its Source Address Table for FID 1 to reflect the location of User B (Port 2).

The frame forwarded out Port 3 has its VLAN Tag stripped before transmission, and it is passed to Bridge 4 as a normal broadcast frame. The frame that is transmitted out Port 4, the 1Q Trunk, retains its VLAN tag.

4-14	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 Types of VLANs 1 802.1Q VLANsSecureFast 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 ComponentsClassifying Frames to a Vlan Configuration Process1 Deﬁning a Vlan Vlan Switch Operation Customizing the Vlan Forwarding ListInside the Switch Receiving Frames from Vlan PortsKnown Unicasts Forwarding DecisionsBroadcasts, Multicasts, and Unknown 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 VlanDisabling VLANs Deleting a VlanEnabling 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 FormatDeleting Forwarding List Entries Paging Through Vlan Forwarding List EntriesAdding 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