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7000 Series L3 Managed Switch Reference Manual for Software v2.0
Glossary C-15
Mbps
Megabits per second.
MBONE
See “Multicast Backbone” on page 15.
MD5
MD5 creates digital signatures using a one-way hash function, meaning that it takes a message and converts
it into a fixed string of digits, also called a message digest.
When using a one-way hash function, one can compare a calculated message digest against the message
digest that is decrypted with a public key to verify that the message hasn't been tampered with. This
comparison is called a "hashcheck."
MDC
Management Data Clock.
MDI
Management Data Interface.
MDIO
Management Data Input/Output.
MDI/MDIX
In cable wiring, the concept of transmit and receive are from the perspective of the PC, which is wired as a
Media Dependant Interface (MDI). In MDI wiring, a PC transmits on pins 1 and 2. At the hub, switch,
router, or access point, the perspective is reversed, and the hub receives on pins 1 and 2. This wiring is
referred to as Media Dependant Interface - Crossover (MDI-X). See “Auto-negotiation” on page 3.
MIB
See “Management Information Base” on page 14.
MOSPF
See “Multicast OSPF” on page 16.
MPLS
See “Multi-Protocol Label Switching” on page 16.
Multicast Backbone
The MBONE is a virtual network. It is layered on top of portions of the physical Internet to support routing
of IP multicast packets since that function has not yet been integrated into many production routers. The
network is composed of islands that can directly support IP multicast, such as multicast LANs like Ethernet,
linked by virtual point-to-point links called "tunnels". The tunnel endpoints are typically workstation-class
machines having operating system support for IP multicast and running the "mrouted" multicast routing
daemon.