Extreme Networks ExtremeWare XOS Guide Manual page 658

Glossary
M (Continued)
MSM
MTU
multicast
multinetting
N
NAT
netlogin
netmask
neutral state/switch
ExtremeWare XOS 11.3 Concepts Guide
Master Switch Fabric Module. This Extreme Networks-proprietary
name refers to the module that holds both the control plane and the
switch fabric for switches that run the ExtremeWare XOS software on
modular switches. One MSM is required for switch operation; adding
an additional MSM increases reliability and throughput. Each MSM
has two CPUs. The MSM has LEDs as well as a console port,
management port, modem port, and compact flash; it may have data
ports as well. The MSM is responsible for upper-layer protocol
processing and system management functions. When you save the
switch configuration, it is saved to all MSMs.
Maximum transmission unit. This term is a configurable parameter
that determines the largest packet than can be transmitted by an IP
interface (without the packet needing to be broken down into smaller
units).
Note: Packets that are larger than the configured MTU size are
dropped at the ingress port. Or, if configured to do so, the system can
fragment the IPv4 packets and reassemble them at the receiving end.
Multicast messages are transmitted to selected devices that specifically
join the multicast group; the addresses are specified in the destination
address field. In other words, multicast (point-to-multipoint) is a
communication pattern in which a source host sends a message to a
group of destination hosts.
IP multinetting assigns multiple logical IP interfaces on the same
circuit or physical interface. This allows one bridge domain (VLAN) to
have multiple IP networks.
Network Address Translation. This is a network capability that
enables a group of computers to dynamically share a single incoming
IP address. NAT takes the single incoming IP address and creates a
new IP address for each client computer on the network.
Network login provides extra security to the network by assigning
addresses only to those users who are properly authenticated. You can
use web-based, MAC-based, or IEEE 802.1x-based authentication with
network login. The two modes of operation are campus mode and ISP
mode.
A netmask is a string of 0s and 1s that mask, or screen out, the
network part of an IP address, so that only the host computer part of
the address remains.
In ESRP, the neutral state is the initial state entered by the switch. In a
neutral state, the switch waits for ESRP to initialize and run. A neutral
switch does not participate in ESRP elections.
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