About the CSX400

HDLC

Cabletron Systems has provided the High-level Data Link Control (HDLC) protocol which is used in conjunction with the Inverse Multiplexing (IMUX) feature and the WPIM-HDSL to conserve a user’s WAN bandwidth between two Cabletron Systems products, over a point-to-point connection. Cabletron Systems products such as the CSX400, CSX200, and HSIM-W6 must be in use on both ends of the WAN link for these functions to work. The HDLC (RAW) protocol reduces the amount of overhead information that needs to be contained within each data packet to direct it to its destination. This decreased packet overhead provides the IMUX and HDSL functions with more bandwidth to transfer user data.

DHCP and NAT

The Dynamic Host Configuration Protocol (DHCP) and Network Address Translation (NAT) method eliminates the expense of purchasing limited public IP addresses for each client on a local network, and the need to re-configure a client if it is moved to a different network.

The CSX400 acts as a DHCP server that allows individual clients (PCs, network equipment) to take turns using a range of private IP addresses (often referred to as local IP addresses), and provides optional secondary setup features for these clients on a per-port basis. The CSX400 distributes these addresses dynamically assigning a local IP address to an individual client from a range of 253 available addresses in its table on a first-come-first-served basis. This local IP address is then “leased” for a predetermined amount of time, which is configured for the particular port. Each Ethernet port provides DHCP services for one Class C subnet and secondary setup features for individual clients that support the use of a default gateway, domain name and WINs server.

On the Wide Area Network (WAN) side, the Network Address Translation (NAT) routing method is used to enable clients assigned with local IP addresses to use the public IP address(es) of the CSX400 WAN interface(s) to access the WAN.

NOTE

A private or “local” network is referred to as a sub network that is using private or “local” IP addresses. An “outside” network refers to a Wide Area Network (WAN) commonly known as an Internet, an intranet is an “Internet” in use on a facility or campus where registered public IP addresses are required.

CSX400 and CSX400-DC User’s Guide 11

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Cabletron Systems CSX400-DC manual Hdlc, Dhcp and NAT
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CSX400-DC, CSX400 specifications

Cabletron Systems was a leading developer of networking solutions, and its CSX400 and CSX200 series of high-performance switches represent some of the key innovations in the field of enterprise networking during their time. Both models were geared towards enhancing network reliability, efficiency, and speed, particularly in environments where heavy data traffic and complex networking demands were prevalent.

The CSX400, designed for larger enterprises, boasts a robust architecture capable of handling significant throughput. One of its standout features is its stackable design, allowing multiple switches to be interconnected and managed seamlessly as a single unit. This scalability provides organizations with the flexibility to expand their networks without significant infrastructure overhauls. The CSX400 supports various Ethernet standards, including 10/100 Ethernet and Gigabit Ethernet, positioning it to effectively manage both legacy and modern networking requirements.

In addition to its scalability, the CSX400 is distinguished by its advanced Layer 2 and Layer 3 routing capabilities. This dual-layer functionality enables efficient data handling and is instrumental in managing traffic between different network segments. Moreover, the switch incorporates features like VLAN (Virtual Local Area Network) support and Quality of Service (QoS) prioritization, allowing for enhanced performance of critical applications and streamlined bandwidth allocation.

On the other hand, the CSX200 series is tailored for smaller enterprises or branch offices needing a reliable yet efficient networking solution. Despite its compact design, the CSX200 is equipped with essential features that promote effective network management and security. It offers a simplified management interface, making it user-friendly for network administrators. The switch also provides essential access control measures, employing technologies like IEEE 802.1X for network access security.

Both the CSX400 and CSX200 prioritize performance through the incorporation of advanced switching technologies. They support features such as Spanning Tree Protocol (STP), enabling loop-free topologies and enhanced network resilience. These attributes are particularly crucial in dynamic networking environments where downtime can have significant repercussions on business operations.

Overall, Cabletron Systems' CSX400 and CSX200 series represent a blend of scalability, advanced routing capabilities, and user-friendly management, making them vital assets for organizations looking to optimize their network infrastructure during a period of rapid technological evolution. With their rich feature sets and unwavering performance, these switches helped pave the way for modern networking solutions that cater to diverse enterprise needs.
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