M
martian address

Network address about which all information is ignored.

mask
See [subnet mask]
MBGP

Multiprotocol BGP. An extension to BGP that allows you to connect multicast topologies within and between BGP ASs.

MBone

Internet multicast backbone. An interconnected set of subnetworks and routers that support the delivery of IP multicast traffic. The MBone is a virtual network that is layered on top of sections of the physical Internet.

MCS

Miscellaneous Control Subsystem. On an M160 router, provides control and monitoring functions for router components and SONET clocking for the router.

MED

Multiple exit discriminator. Optional BGP path attribute consisting of a metric value that is used to determine the exit point to a destination when ...

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