Layer 2 Switching

49

 

Table 8: Parameters in the output of the SHOW SWITCH QOS command

 

 

 

 

Parameter

Meaning

 

 

 

 

Priority level

The priority level of the frame.

 

 

 

 

QOS egress queue

The Quality Of Service egress queue that frames with this

 

 

priority level join.

 

 

 

Spanning Tree Protocol (STP)

The Spanning Tree Protocol (STP) makes it possible to automatically disable redundant paths in a network to avoid loops, and enable them when a fault in the network means they are needed to keep traffic flowing. A sequence of LANs and switches may be connected together in an arbitrary physical topology resulting in more than one path between any two switches. If a loop exists, frames transmitted onto the extended LAN would circulate around the loop indefinitely, decreasing the performance of the extended LAN. On the other hand, multiple paths through the extended LAN provide the opportunity for redundancy and backup in the event of a bridge experiencing a fatal error condition.

The spanning tree algorithm ensures that the extended LAN contains no loops and that all LANs are connected by:

■Detecting the presence of loops and automatically computing a logical loop-free portion of the topology, called a spanning tree. The topology is dynamically pruned to a spanning tree by declaring the ports on a switch redundant, and placing the ports into a ‘Blocking’ state.

■Automatically recovering from a switch failure that would partition the extended LAN by reconfiguring the spanning tree to use redundant paths, if available.

Spanning Tree Port States

Each port can be in one of five Spanning Tree states, and one of two switch states. The Spanning Tree states (Table 9) affect the behaviour of ports whose switch state is enabled.

Table 9: Spanning tree port states

State

Meaning

 

 

DISABLED

STP operations are disabled on the port. The port can still

 

switch if its switch state is enabled.

 

 

LISTENING

The port is enabled for receiving frames only.

 

 

LEARNING

The port is enabled for receiving frames only, and the

 

Learning Process can add new source address information

 

to the Forwarding Database.

 

 

FORWARDING

The normal state for a switch port. The Forwarding Process

 

and the Spanning Tree entity are enabled for transmit and

 

receive operations on the port.

 

 

BLOCKING

The Spanning Tree entity has disabled the Forwarding

 

process for transmit and receive operations on the port, but

 

the Spanning Tree entity itself remains enabled for transmit

 

and receive operations on the port.

 

 

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

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Allied Telesis C613-02013-00 manual Spanning Tree Protocol STP, Spanning Tree Port States
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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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