EMC Connectrix EC-1200 Planning Manual page 223

Glossary
Subnet Mask Used by a computer to determine whether another computer
with which it needs to communicate is located on a local or
remote network. The network mask depends upon the class of
networks to which the computer is connecting. The mask
indicates which digits to look at in a longer network address and
allows the router to avoid handling the entire address. Subnet
masking allows routers to move the packets more quickly.
Typically, a subnet may represent all the machines at one
geographic location, in one building, or on the same local area
network.
Switch Priority Value configured into each switch in a fabric that determines its
relative likelihood of becoming the fabric's principal switch.
T
TCP/IP Transmission Control Protocol/Internet Protocol.
Topology Logical and/or physical arrangement of stations on a network.
Trap An asynchronous (unsolicited) notification of an event originating on
an SNMP-managed device and directed to a centralized SNMP
Network Management Station.
Toggle To change the state of a feature/function that has only two states. For
example, if a feature/function is enabled, toggling changes the state to
disabled.
U
ULP Upper Layer Protocol, the protocol user of FC-4, including IPI, SCSI,
IP, and SBCCS.
Unblocked Port Devices communicating with an unblocked port can log in to a
Connectrix switch or a similar product and communicate with
devices attached to any other unblocked port if the devices are in the
same Zone.
Unicast Unicast routing provides one or more optimal path(s) between any of
two switches that make up the fabric. (This is used to send a single
copy of the data to designated destinations.)
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Connectrix v6.02 Planning Guide