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Glossary I ICMP ICMP (Internet Control Message Protocol) is TCP/IP protocol used to send error and control messages. For example, a router uses ICMP to notify the sender that its destination node is not available. IGMP IGMP (Internet Group Management Protocol) governs the management of multicast groups in a TCP/IP network. L LLDP The LLDP (Link Layer Discovery Protocol) provides a method for switches, routers and access points to advertise their identification, configuration and capabilities to neighboring devices that store the data in a MIB (management information base). N NTP NTP (Network Time Protocol) is used to update the real time clock in a computer. There are numerous primary and secondary servers in the Internet that are synchronized to the international time standard Coordinated Universal Time (UTC) via radio, satellite or modem. R RFC RFC (Request For Comment) is document that describes the specifications for a recommended technology. RFCs are used by the Internet Engineering Task Force (IETF) and other standards bodies. RM RM (Redundancy Manager) is a switch function which allows you to close both ends of a backbone in a line-type configuration to create a redundant HIPER ring. 192 31007122 8/2006