HP StorageWorks 2.32 SAN Switch - Manual (Page 342)

Glossary–32 Web Tools Version 3.0.x/4.0.x User Guide
Glossary
Trap (SNMP)
The message sent by an SNMP agent to inform the SNMP management station of a critical
error.
See also SNMP.
Trunking
See ISL Trunking.
Tunneling
A technique for enabling two networks to communicate when the source and destination hosts
are both on the same type of network, but are connected by a different type of network.
U_Port
Universal Port. A switch port that can operate as a G_Port, E_Port, F_Port, or FL_Port. A port
is defined as a U_Port when it is not connected or has not yet assumed a specific function in
the fabric.
UDP
User Datagram Protocol. A protocol that runs on top of IP and provides port multiplexing for
upper-level protocols.
ULP_TOV
Upper-level Time-out Value. The minimum time that a SCSI ULP process waits for SCSI
status before initiating ULP recovery.
ULP
Upper-level Protocol. The protocol that runs on top of Fibre Channel. Typical upper-level
protocols are SCSI, IP, HIPPI, and IPI.
Unicast
The transmission of data from a single source to a single destination.
See also broadcast, multicast.
user account
A login intended for use by the customer to monitor, but not control, switch operation.
See also account level switches.
VC
Virtual circuit. A one-way path between N_Ports that allows fractional bandwidth.