Packet Prioritization, 802.1p QOS | GarrettCom 6K32TRC guide

Magnum 6K32T & 6K32TRC Managed Switch

Installation and User Guide 05/07)

2.2.7Packet Prioritization, 802.1p QOS

Quality of Service means providing consistent predictable data delivery to

users from datagram paths that go all across a network. As a LAN device, the Magnum 6K32T & 6K32TRC can do its part to prevent any QOS degradation while it is handling Ethernet traffic through its ports and buffers.

The Magnum 6K32T & 6K32TRC switching hardware supports the IEEE 802.1p standard and fulfills its role in support of QOS, giving packet processing priority to priority tagged packets according to the 802.1p standard. In addition to hardware support for QOS, the MNS software (R3) supports two priority queues that can be shared across the eight levels of defined packet priorities for application-specific priority control by the user through software configuration settings.

2.2.8Frame Buffering and Flow Control

Magnum 6K32T & 6K32TRC’s are store-and-forward switches. Each frame

(or packet) is loaded into the Switch’s memory and inspected before forwarding can occur. This technique ensures that all forwarded frames are of a valid length and have the correct CRC, i.e., are good packets. This eliminates the propagation of bad packets, enabling all of the available bandwidth to be used for valid information.

While other switching technologies (such as "cut-through" or "express") impose minimal frame latency, they will also permit bad frames to propagate out to the Ethernet segments connected. The "cut-through" technique permits collision fragment frames (which are a result of late collisions) to be forwarded which add to the network traffic. Since there is no way to filter frames with a bad CRC (the entire frame must be present in order for CRC to be calculated), the result of indiscriminate cut- through forwarding is greater traffic congestion, especially at peak activity. Since collisions and bad packets are more likely when traffic is heavy, the result of store-and- forward operation is that more bandwidth is available for good packets when the traffic load is greatest.

When the Magnum 6K32T & 6K32TRC Switch detects that its free buffer queue space is low, the Switch sends industry standard (full-duplex only) PAUSE packets out to the devices sending packets to cause “flow control”. This tells the sending devices to temporarily stop sending traffic, which allows a traffic catch-up to occur without dropping packets. Then, normal packet buffering and processing resumes.

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6K32T, 6K32TRC specifications

The GarrettCom 6K32TRC and 6K32T are advanced, ruggedized network switches designed for mission-critical applications in challenging environments. These switches are notable for their reliability, versatility, and high performance, making them ideal for industries such as transportation, utilities, and industrial automation.

One of the key features of the 6K32TRC and 6K32T is their robust construction. These switches are built to withstand extreme temperatures, humidity, and harsh conditions, ensuring continued operation even in the most demanding settings. With an operational temperature range of -40°C to +75°C, they can function effectively in various climates, making them perfect for outdoor or unconditioned environments.

Both models are equipped with Layer 2 and Layer 3 switching capabilities, offering flexibility for different networking needs. The 6K32T, for instance, is designed specifically for applications that require high-speed connectivity and data management. With support for various Ethernet protocols, these switches provide reliable data transmission and low latency, essential for real-time applications.

The 6K32TRC model features enhanced redundancy and failover capabilities. It supports a range of network topologies including ring, star, and mesh configurations, ensuring that network uptime is maximized even in the face of component failures. Redundant power supply options further guarantee continuous operation.

Scalability is another highlight of the GarrettCom 6K32 series. The switches are modular, allowing users to easily add or replace various interface cards to support additional network connections or management features without significant downtime.

Security is paramount in industrial settings, and the 6K32TRC and 6K32T adhere to modern cybersecurity standards. They include features such as access control lists (ACLs), Secure Shell (SSH) for encrypted management access, and VLAN tagging to enhance network security.

In terms of management, the switches support an array of protocols for easy integration and monitoring within existing networks. SNMP, RMON, and web-based management interfaces streamline the administrative process, ensuring that network managers can efficiently oversee their operations.

Overall, the GarrettCom 6K32TRC and 6K32T switches exemplify reliability and advanced technology. Their robust design, comprehensive feature set, and focus on security make them an excellent choice for organizations requiring resilient network solutions in challenging industrial environments.