Example 4, Isolating Network Traffic According to Protocol

8.Bridge 1 receives the frame and recognizes User B’s MAC address. The frame is forwarded to the correct port and the bridge’s Source Address Table is updated with an entry for the Mail Server’s MAC address. User B receives the Mail Server’s response. Any further unicast traffic between the Mail Server and User B will be handled in the same fashion by the switches in the network.

4.4EXAMPLE 4, ISOLATING NETWORK TRAFFIC ACCORDING TO PROTOCOL

This final example illustrates how to restrict AppleTalk protocol traffic of a network to prevent unwanted multicast frames from slowing down the whole network and yet be able to send and receive frames associated with other protocols.

In this example, illustrated in Figure 4-7, the Publications Department is relocating from another site to the third floor. This network will consist of six computers and a printer using several protocols including the AppleTalk protocol. A characteristic of the AppleTalk protocol is to send all frames as multicast frames. These multicast frames will be isolated to a VLAN (Grey VLAN) to prevent them from slowing down the other networks.

A second VLAN (Yellow VLAN) will be established to handle traffic of other protocols. The Publications Department users will have access to the mail server on the first floor along with the Red, Blue, and Green VLANs.

4-14Examples

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Enterasys Networks 802.1Q manual Example 4, Isolating Network Traffic According to Protocol

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.