Layer 2 Switching

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Generic VLAN Registration Protocol (GVRP)

The GARP application GVRP allows routers in a network to dynamically share VLAN membership information, to reduce the need for statically configuring all VLAN membership changes on all switches in a network. See the Generic Attribute Registration Protocol (GARP) chapter in the Rapier Switch Software Reference.

Layer 2 Switching Process

The Layer 2 switching process comprises related but separate processes. The Ingress Rules admit or discard frames based on their VLAN tagging. The Learning Process learns the MAC addresses and VLAN membership of frames admitted on each port. The Forwarding Process determines which ports the frames are forwarded to, and the Quality of Service priority with which they are transmitted. Finally, the Egress Rules determine for each frame whether VLAN tags are included in the Ethernet frames that are transmitted. These processes assume that each station on the extended LAN has a unique data link layer address, and that all data link layer frames have a header which includes the source (sender’s) MAC address and destination (recipient’s) MAC address.

The Ingress Rules

When a frame first arrives at a port, the Ingress Rules for the port check the VLAN tagging in the frame to determine whether it will be discarded or forwarded to the Learning Process.

The first check depends on whether the Acceptable Frame Types parameter is set to Admit All Frames or to Admit Only VLAN Tagged Frames. A port that transmits only VLAN tagged frames, regardless of which VLAN the port belongs to, will be automatically set to Admit Only VLAN Tagged Frames. The user cannot change this setting. Frames with a null numerical VLAN Identifier (VID) are VLAN-untagged frames, or frames with priority tagging only.

Every frame received by the switch must be associated with a VLAN. If a frame is admitted by the Acceptable Frame Types parameter, the second part of the Ingress Rules associates each untagged frame admitted with the VID of the VLAN for which the port is untagged.

Every port belongs to one or more VLANs, and therefore every incoming frame will have a VID to show which VLAN it belongs to. The final part of the Ingress Rules depends on whether Ingress Filtering is enabled for the port. If Ingress Filtering is disabled, all frames are passed on to the Learning Process, regardless of which VLAN they belong to. If Ingress Filtering is enabled, frames are admitted only if they have the VID of a VLAN to which the port belongs. If they have the VID of a VLAN to which the port does not belong, they are discarded.

The default settings for the Ingress Rules are to Admit All Frames, and for Ingress Filtering to be OFF. This means that if no VLAN configuration has been done, all incoming frames pass on to the Learning Process, regardless of

Rapier Switch Software Release 2.2.1 C613-02013-00 Rev A

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Allied Telesis C613-02013-00 manual Generic Vlan Registration Protocol Gvrp, Layer 2 Switching Process, Ingress Rules
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C613-02013-00 specifications

The Allied Telesis C613-02013-00 is a versatile and powerful network switch designed to meet the demands of modern networking environments. This device is part of Allied Telesis's extensive range of networking solutions, catering to both enterprise and industrial applications. It is engineered for high performance, reliability, and ease of management, making it a suitable choice for organizations that require robust connectivity solutions.

One of the main features of the C613-02013-00 is its support for advanced Layer 2 switching capabilities. This provides businesses with the necessary tools to manage and direct network traffic efficiently. The switch includes support for VLAN (Virtual Local Area Network) technology, which allows for the segmentation of network traffic, enhancing both security and performance. With VLANs, organizations can isolate critical workloads and improve network management while ensuring that sensitive information is protected from unauthorized access.

Another key characteristic of the C613-02013-00 is its extensive support for Power over Ethernet (PoE). This feature enables the switch to deliver electrical power along with data over standard Ethernet cabling. This is particularly beneficial for powering devices such as IP cameras, wireless access points, and VoIP phones, reducing the need for additional power supply infrastructure. With PoE capabilities, the switch simplifies installation and enhances flexibility in deploying network devices.

The C613-02013-00 also boasts advanced network management features, including support for SNMP (Simple Network Management Protocol) for efficient monitoring and troubleshooting. This ensures that network administrators can maintain optimal performance and quickly address any issues that arise. Additionally, the switch supports network redundancy features like Rapid Spanning Tree Protocol (RSTP), which helps to prevent network loops and minimizes downtime.

In terms of physical characteristics, the C613-02013-00 is designed for durability and ease of deployment in various environments. Its compact form factor allows for effective space utilization in data centers and network closets. Moreover, it features a fanless design, making it suitable for deployment in noise-sensitive environments such as offices and classrooms.

In summary, the Allied Telesis C613-02013-00 is a robust network switch offering advanced features such as Layer 2 switching, PoE support, and comprehensive network management capabilities. Its design and performance make it an excellent choice for businesses seeking to enhance their network infrastructure with reliable and secure connectivity solutions.
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