Netgear XCM8806 Chassis Hardware Installation Guide - Page 331

NETGEAR 8800 Chassis Switch CLI Manual • Message-The message contains the log information with text that is specific to the problem. The switch maintains a configurable number of messages in its internal (memory-buffer) log (1000 by default). You can display a snapshot of the log at any time. In addition to viewing a snapshot of the log, you can configure the system to maintain a running real-time display of log messages on the console display or telnet session. In addition to maintaining an internal log, the switch supports remote logging by way of the UNIX syslog host facility. EMS supports IPv6 as a parameter for filtering events. sFlow Statistics sFlow® is a technology for monitoring traffic in data networks containing switches and routers. It relies on statistical sampling of packets from high-speed networks, plus periodic gathering of the statistics. A User Datagram Protocol (UDP) datagram format is defined to send the information to an external entity for analysis. sFlow consists of a (Management Information Base) MIB and a specification of the packet format for forwarding information to a remote agent. Details of sFlow specifications can be found in RFC 3176 and at the following website: http://www.sflow.org NETGEAR 8800 allows you to collect sFlow statistics on a per port basis. An agent, residing locally on the switch, sends data to a collector that resides on another machine. You configure the local agent, the address of the remote collector, and the ports of interest for sFlow statistics gathering. You can also modify default values for how frequently on average a sample is taken, how often the data is sent to the collector, and the maximum load allowed on the CPU before throttling the statistics gathering. For information about software licensing, including how to obtain and upgrade your license, see Appendix A in the NETGEAR 8800 User Manual. RMON RMON is the common abbreviation for the Remote Monitoring Management Information Base (MIB) system defined by the Internet Engineering Task Force (IETF) documents RFC 1757 and RFC 2021, which allows you to monitor LANs remotely. Using the RMON capabilities of the switch allows network administrators to improve system efficiency and reduce the load on the network. The IETF defines nine groups of Ethernet RMON statistics. The switch supports the following four of these groups, as defined in RFC 1757: • Statistics • History • Alarms • Events Chapter 8. Commands for Status Monitoring and Statistics | 331