Planning for CSX400 ISDN Configuration

TCP/IP Route Addresses — If the CSX400 is to direct traffic to networks or stations beyond the remote router, the routing table in the CSX400 can be “seeded” with static IP routes. An IP route includes an IP address, subnet mask and metric. The metric is a number representing the perceived cost in reaching the remote network or station.

The CSX400 routing table must be seeded statically so that it dials out to the appropriate remote router when IP traffic is targeted to networks and stations beyond that remote router. After the link is established, RIP update packets are dynamically added to the routing table. Seeding the routing table is not necessary when the CSX400 never dials out; it discovers remote networks and stations beyond the calling router as soon as RIP updates arrive (provided the remote router supports RIP and RIP packets are allowed to flow on the WAN link).

TCP/IP Default Route — One default route should be designated in the routing table for all traffic that cannot be directed to other specific routes. You need to define the default route for a remote router if the CSX400 will be placing calls to that remote router.

Source (Target) and Remote WAN IP Addresses — You may need to specify a Source WAN IP address and/or a Remote WAN IP address for the WAN connection to the remote router depending on IP address negotiation under PPP. Check with your system administrator for details on whether the router must communicate in numbered or unnumbered mode and what addresses are required.

In unnumbered mode, neither IP address is defined on the link. In numbered mode, one IP address is defined on each end of the WAN link. These addresses may or may not belong to the same subnetwork. They may also be determined automatically, negotiated, or forced by the network administrator.

The CSX400 automatically determines whether to run in unnumbered mode or numbered mode. If unnumbered mode negotiation fails, numbered mode is attempted using the Ethernet LAN IP address as a default. If you have specified a Source WAN IP address, unnumbered mode negotiation is not performed; i.e., the operating mode is numbered. If a Source WAN IP address is explicitly defined, the router will not, as a rule, accept another local address from the remote end. In numbered mode without an explicit Source WAN IP address, this address can be negotiated to a different value by the remote end.

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Cabletron Systems CSX400-DC manual Planning for CSX400 Isdn Configuration
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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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