Enterasys Networks 802.1Q manual Switch 2 Forwards to 1Q Trunk

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Example 3, 1D Trunk Connection to 802.1Q VLAN Network

Figure 4-8 Bridge 1 Broadcasts Frames

User B

Bridge 1

 

2

 

4 3

Red VLAN

1

 

 

4

Floor 4

Bridge 2

Blue VLAN

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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.

Figure 4-9 Switch 2 Forwards to 1Q Trunk

Floor 3

 

 

2

Bridge 3

1

2 3

Blue VLAN

 

 

4

Floor 2

Bridge 4

Red VLAN

File Server

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4.When Switch 1 receives the tagged broadcast frame, it also examines the tag and classifies the frame as belonging to the Red VLAN. This broadcast frame is then sent to all ports eligible to receive Red VLAN frames. In this case only the 1D trunk, Port 3, is eligible, as it is considered a member of all VLANs for forwarding purposes. The VLAN Tag is stripped from the frame and the frame is transmitted out Port 3 as shown in Figure 4-10. The Source Address Table, FID 1 for Switch 1 is updated to contain User B.

4-12Examples

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Contents 802.1Q Vlan User’s Guide Page Page Page Contents Iv Contents Figures Tables Using this Guide Structure of this GuideRelated Documents Document ConventionsVirtual Local Area Networks Defining VLANsTypes of VLANs Example of a Vlan1 802.1Q VLANs SecureFast VLANsOther Vlan Strategies Benefits and RestrictionsVlan Terms Vlan IDGeneric Attribute Registration Protocol Garp Getting Help Your email addressDescription Vlan ComponentsConfiguration Process Defining a VlanClassifying Frames to a Vlan Customizing the Vlan Forwarding ListVlan Switch Operation Inside the SwitchReceiving Frames from Vlan Ports Forwarding DecisionsBroadcasts, Multicasts, and Unknown Unicasts Garp Switch Operation Known UnicastsPage Managing the Switch Switch Without VLANsSwitch with VLANs Switch Management with Only Default VlanSwitch Management with VLANs Summary of Vlan Local Management 802.1Q Vlan Screen Hierarchy802.1Q Vlan Configuration Menu Screen When to UseHow to Access Screen ExampleMenu Definitions Device Vlan Configuration Screen Device Vlan Configuration Screen Field Definitions ToggleVlan Name lower part 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 ListSee the names of the VLANs associated with the Vlan ID. If a Filter Using Vlan Displaying Vlan IDs Associated with a PortVlan Forwarding Configuration Screen Selecting the Type of Filtering for a PortPort Type Viewing Current Vlan Ports Paging Through Vlan Forwarding List EntriesAdding Forwarding List Entries Deleting Forwarding List Entries Changing the Frame FormatProtocol Vlan Configuration Screen Protocol Vlan Configuration ScreenVlan ID Protocol Type Assigning a Protocol Family to a Vlan ID Ether type28VLAN Configuration Protocol Ports Configuration Screen Displaying the Protocol Types on Current Ports10 Protocol Ports Configuration Screen Adding/Deleting Ports Associated with a Vlan ID Delete ALL32VLAN Configuration Quick Vlan Walkthrough11 Walkthrough Stage One 12 Walkthrough Stage Two Test Vlan 14 Walkthrough Stage Four 15 Final Walkthrough Stage Page Example 1, Single Switch Operation ExamplesSolving the Problem Switch Configured for VLANsExample 2, VLANs Across Multiple Switches Frame HandlingExample 2, VLANs Across Multiple Switches Switch 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 Switch 4 is set as follows Frame Handling Switch 2 Forwards to 1Q Trunk 10 Switch 1 Forwards to 1D Trunk Example 4, Isolating Network Traffic According to Protocol 11 Example 4, Isolating Traffic According to Protocol 16Examples Example 4, Isolating Network Traffic According to Protocol 18Examples Index NumericsIndex-2 Index-3

802.1Q specifications

Enterasys Networks, a subsidiary of the Siemens Group, is widely recognized for its comprehensive networking solutions, with a strong emphasis on security, reliability, and performance. One of the key technologies offered by Enterasys is 802.1Q, a critical component of Ethernet networking that establishes standards for VLAN (Virtual Local Area Network) tagging. This technology is essential for enhancing network performance and managing traffic efficiently.

The primary feature of 802.1Q is its ability to create VLANs, which segment a physical network into multiple logical networks. This segmentation improves network security by isolating sensitive data and restricting access to specific users or devices. With VLANs, organizations can reduce broadcast traffic, thereby enhancing overall network efficiency. Different departments within an organization can operate on their own VLAN, ensuring that their traffic is kept separate from others.

One significant technological aspect of 802.1Q is its tagging method. When a frame passes through a switch port configured for IEEE 802.1Q, the switch appends a VLAN tag to the frame. This tag contains important information, such as the VLAN ID, enabling switches and devices throughout the network to identify which VLAN the frame belongs to. This tagging is especially critical in environments where multiple VLANs share the same physical infrastructure.

Another characteristic of Enterasys Networks' implementation of 802.1Q is interoperability with existing network standards and protocols. This means that organizations can implement VLAN tagging without requiring major upgrades or replacements of their switch hardware. Enterasys ensures that its switches are compliant with various industry standards, making it easier for enterprises to integrate these solutions into their existing network settings.

Security is another vital feature of Enterasys Networks’ 802.1Q offering. By leveraging VLANs, organizations can enforce stricter access controls and policies, reducing the risk of unauthorized access to sensitive network segments. This is particularly beneficial for industries with stringent compliance requirements, such as finance and healthcare.

In summary, Enterasys Networks' 802.1Q technology plays a pivotal role in modern networking by facilitating VLAN creation, enabling efficient traffic management, ensuring interoperability, and bolstering network security. As organizations increasingly rely on connected devices and data-driven processes, technologies like 802.1Q are essential for building robust, scalable, and secure networking environments.
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