RMON

RMON (Remote Monitoring) is a facility used to manage networks remotely while providing multi-vendor interoperability between monitoring devices and management stations. RMON is defined by an SNMP MIB. This MIB is divided into nine different groups, each gathering specific statistical information or performing a specific function. RMON-capable devices gather network traffic data and then store them locally until downloaded to an SNMP management station.

The ELH100-12/24TX supports four of the nine groups of RMON defined for Ethernet networks on a per segment basis. Specifically, these are:

Statistics: a function that maintains counts of network traffic statistics such as number of packets, broadcasts, collisions, errors, and distribution of packet sizes.

History: a function that collects historical statistics based on user- defined sampling intervals. The statistical information collected is the same as the Statistics group, except on a time stamped basis.

Alarm: a function that allows managers to set alarm thresholds based on traffic statistics. Alarms trigger other actions through the Event group.

Event: a function that operates with the Alarm group to define an action that will be taken when an alarm condition occurs. The event may write a log entry and/or send a trap message.

Because the Agent Module must be attached to either the 10 or 100 Mbps stack segment, RMON can only be activated for one segment at a time. You must therefore use an out-of-band connection to the Agent Module to select the segment to activate for RMON. However, note that RMON statistics and other information can only be viewed using a connection to the on-board web agent or via other compatible SNMP management applications.

Auto-Sensing and Auto-Negotiation

Auto-sensing is a process that permits the hub to automatically select the operational speed of its ports. When an RJ-45 port on the base unit is connected, the hub detects and configures the port to the speed of the network the port is connected to, either 10 Mbps or 100 Mbps. Auto- sensing is configurable in the Port Configuration Menu of the console menus or via SNMP.

The 10Base-T/100Base-TX optional modules support auto-negotiation. The port automatically negotiates the best connection possible with the attached device. However, if the attached device must operate at full duplex, then it must also support auto-negotiation. Otherwise, you can set the mode manually using the mode selection switch on the module, or via the management agent.

The 100Base-FX module does not support auto-negotiation. You need to configure the duplex setting via the front panel switch.

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Product Overview 9

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Cabletron Systems ELH100 manual Rmon, Auto-Sensing and Auto-Negotiation

ELH100 specifications

The Cabletron Systems ELH100 is a robust and innovative networking device that was designed for use in high-performance network environments. Introduced during the late 1990s, the ELH100 served as a valuable solution for enterprises looking to enhance their network efficiency and reliability. This device is particularly notable for its combination of advanced features, cutting-edge technologies, and versatile characteristics.

One of the main features of the ELH100 is its ability to support multiple Ethernet standards, including 10BASE-T and 100BASE-TX, making it highly flexible for diverse networking needs. This multi-standard support provided businesses with the ability to upgrade their networking infrastructure without entirely replacing existing equipment, allowing for a more cost-effective transition to higher-speed connections.

The ELH100 is equipped with a variety of ports, enabling it to connect to various devices seamlessly. Its design includes multiple media access control (MAC) addresses and the capability of supporting a sizable number of simultaneous connections. This design ensures optimal performance, even in environments requiring high data throughput.

In terms of technology, the ELH100 utilizes a pioneering architecture for load balancing and traffic management. This technology ensures that network bandwidth is used efficiently, minimizing bottlenecks and latency while maximizing throughput. Additionally, the device features hardware-based switching, which accelerates data transmission within the network, providing a competitive edge in applications that demand high-speed access.

Another defining characteristic of the ELH100 is its management capabilities. The device supports remote management via simple network management protocol (SNMP), allowing network administrators to monitor performance, configure settings, and troubleshoot issues from a central location. Such features not only enhance usability but also contribute to improved network uptime.

The ELH100 also emphasizes security features, including VLAN support, which permits the segmentation of network traffic. This capability helps in isolating different segments of the network, increasing both performance and security by preventing unauthorized access to sensitive data.

In summary, the Cabletron Systems ELH100 is a noteworthy networking solution that amalgamates versatility, efficiency, and advanced technology, making it a mainstay in the networking devices market during the era of its popularity. Its multi-standard support, hardware-based switching, management features, and security protocols underscore its capability to meet the evolving demands of enterprise networking environments.