Configuration Process

2.3CONFIGURATION PROCESS

Before a VLAN can operate, steps must be performed to configure the switch to establish and configure a VLAN. Enterasys Networks VLAN aware SmartSwitches default to operate in the 802.1Q VLAN mode. However, further configuration is necessary to establish multiple logical networks.

NOTE: The actual steps involved in VLAN configuration using Local Management are presented in Chapter 3, VLAN Configuration.This brief section describes the actions that must be taken in very general terms, and is intended only to aid in the Administrator’s understanding of VLAN switch operation.

2.3.1Defining a VLAN

A VLAN must exist and have a unique identity before any ports or rules can be assigned to it. The Administrator defines a VLAN by assigning it a unique identification number (the VLAN ID), a filter database association, and an optional name. The VLAN ID is the number that will identify data frames originating from, and intended for, the ports that will belong to this new VLAN.

2.3.2Classifying Frames to a VLAN

Now that a VLAN has been created, rules are defined to classify all frames in a VLAN. This is accomplished through management by associating a VLAN ID with each port on the switch. Optionally, frames can be classified according to a protocol identifier contained within the frame. The order of frame classification priority is by VLAN Tag, a protocol match, and lastly the PVID. This combination of the switch port’s identification and the VLAN ID becomes the Port VLAN ID (PVID).

At the same time, the Administrator configures the trunk ports that need to consider themselves members of every VLAN. The configuration of trunk ports is very important in multiswitch VLAN configurations where a frame’s VLAN membership needs to be maintained across several switches.

2.3.3Customizing the VLAN Forwarding List

Each port on a VLAN aware switch has a VLAN forwarding list that contains, as a minimum, the PVID of the VLAN configured. Additionally, the Port VLAN Forwarding List of each port can be configured to allow any number of VLANs to be added to its list. In the case of GMRP (dynamic VLANs), the list can have VLANs added and deleted by the switch as directed by the protocol.

2-2VLAN Operation

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Enterasys Networks 802.1Q manual Configuration Process, Defining a Vlan, Classifying Frames to a Vlan

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.