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Glossary
GL-8
Cisco 10008 Router Hardware Installation Guide
OL-0659-13
MAC
Media Access Control. Lower of the two sublayers of the data link layer defined by the IEEE. The MAC
sublayer handles access to shared media.
MAC address
Standardized data link layer address that is required for each port or device that connects to a LAN.
Other devices in the network use these addresses to locate specific ports in the network, and to create
and update routing tables and data structures. MAC addresses are 6 bytes long and are controlled by
the IEEE. Also known as a hardware address, MAC-layer address, or physical address.
Major alarm
One of a group of alarm conditions that are considered the second most severe of all reportable alarms.
Major alarms affect several subscribers who connect to the reporting node. You can use the
show
facility-alarm status
IOS command to obtain more information about the problem. See also Critical
alarm and Minor alarm.
MAN
Metropolitan-area network. A network that spans a metropolitan area. Generally, a MAN spans a larger
geographic area than a LAN, but a smaller geographic area than a WAN. Compare with LAN and
WA N.
Management
Information Base
See MIB.
Media Access
Control
See MAC.
Metropolitan-area
network
See MAN.
MIB
Management Information Base. Database of network management information that is used and
maintained by a network management protocol such as SNMP or CMIP. The value of a MIB object can
be changed or retrieved using SNMP or CMIP commands, usually through a GUI-based network
management system. MIB objects are organized in a tree structure that includes public (standard) and
private (proprietary) branches.
Minor alarm
One of a group of alarm conditions that are considered the third most severe of all reportable alarms.
Minor alarms affect a single or small number of subscribers who connect to the reporting node. You
can use the
show facility-alarm status IOS command to obtain more information about the problem. See
also Critical alarm and Major alarm.
MLP
Multilink Point-to-Point Protocol. A method of splitting, recombining, and sequencing datagrams
across multiple logical data links.
MMF
Multimode fiber. Optical fiber supporting propagation of multiple frequencies of light. See also
Single-mode fiber.
MPLS
Multiprotocol Label Switching. An emerging industry standard upon which tag switching is based.
Multicast
Single packets copied by the network and sent to a specific subset of network addresses. These
addresses are specified in the Destination Address field. Compare with Broadcast and Unicast.
Multilink
Point-to-Point
See MLP.
Multimode fiber
See MMF.