Bridging

Subnet Mask

A subnet mask is used by a device to determine whether a destination address exists within its own subnetwork (logical division of the network by router or gateway) and can be reached directly, or whether it is unknown and therefore must be delivered to a router (as speciÞed by the deviceÕs IP routing table or default gateway address).

A subnet mask should be set at the device if it will issue SNMP traps in a routed environment, so that the trap messages it generates will be routed correctly.

A subnet mask acts as a Þlter for destination IP addresses. It is a 32-bit quantity in which all bits that correspond to the network portion (both site and subnet identifying bits) of the deviceÕs IP address are set to 1, and all bits that correspond to the host portion are set to 0.

The device will logically AND a destination trap IP address with the subnet mask to determine which portion of the address identiÞes the network/subnetwork. The device then compares the result on a bit-to-bit basis with the network identifying bits in its own IP address. If the network portions match, the bridging device transmits the trap onto its subnetwork. If they do not match, the device transmits the trap through a router or gateway.

This Þeld can only be edited (with the correct security access) via Local Management for the device (or the MIBTools utility). Refer to the appropriate device-speciÞc UserÕs Guide for more information.

MAC Address

This Þeld displays the Media Access Control (MAC) layer address which identiÞes the ports/interfaces of the bridging device on a network. This six-byte address is set at the factory and is unique to each interface. Each byte is identiÞed in bit order starting with the most signiÞcant bit. You cannot conÞgure this Þeld.

The following Þelds apply to the Source Route ConÞguration window:

Local Segment

This Þeld displays the unique segment number that identiÞes the segment attached to the selected interface (either of the Token Ring or FDDI interfaces). The bridge adds the Local Segment number to the routing information Þeld of source route discovery frames. Valid values range from 0 to 4095.

Target Segment

This Þeld displays the unique segment number of the target segment that the source routed frame will be forwarded to. Valid values range from 0 to 4095.

Hop Count Limit

The maximum number of routing descriptors (i.e., bridge hops) allowed for an All Routes Explorer or a Spanning Tree Explorer frame received by the device. This will reduce the unnecessary propagation of explorer frames through the network.

4-60

Source Route Configuration

Page 105 Page 107
Page 106
Image 106
Cabletron Systems CSX400, CSX200 manual Subnet Mask, Local Segment, Target Segment, Hop Count Limit
Page 105 Page 107

CSX200, 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.
Top Page Image Contents