Cisco IPS 7.1 Installation Manual page 449

U
Unique Device Identifier. Provides a unique identity for every Cisco product. The UDI is composed of
UDI
the PID, VID, and SN. The UDI is stored in the Cisco IPS ID PROM.
UniDirectional Link Detection. Cisco proprietary protocol that allows devices connected through
UDLD
fiber-optic or copper Ethernet cables connected to LAN ports to monitor the physical configuration of
the cables and detect when a unidirectional link exists. When a unidirectional link is detected, UDLD
shuts down the affected LAN port and sends an alert, since unidirectional links can cause a variety of
problems, such as, spanning tree topology loops.
User Datagram Protocol. Connectionless transport layer protocol in the TCP/IP protocol stack. UDP is
UDP
a simple protocol that exchanges datagrams without acknowledgments or guaranteed delivery,
requiring that error processing and retransmission be handled by other protocols. UDP is defined in
RFC 768.
To direct a router to remove a previously applied block.
unblock
See UDLD.
UniDirectional Link
Detection
An unvirtualized sensing interface has not been divided into subinterfaces and the entire interfaces can
unvirtualized
be associated with at most one virtual sensor.
sensing interface
Uninterruptable Power Source.
UPS
Coordinated Universal Time. Time zone at zero degrees longitude. Formerly called Greenwich Mean
UTC
Time (GMT) and Zulu time.
8-bit Unicode Transformation Format. A variable-length character encoding for Unicode. UTF-8 can
UTF-8
represent every character in the Unicode character set and is backwards-compatible with ASCII.
V
VLAN ACL. An ACL that filters all packets (both within a VLAN and between VLANs) that pass
VACL
through a switch. Also known as security ACLs.
Version identifier. Part of the UDI.
VID
Versatile Interface Processor. Interface card used in Cisco 7000 and Cisco 7500 series routers. The VIP
VIP
provides multilayer switching and runs Cisco IOS. The most recent version of the VIP is VIP2.
A logical grouping of sensing interfaces and the configuration policy for the signature engines and
virtual sensor
alarm filters to apply to them. In other words, multiple virtual sensors running on the same appliance,
each configured with different signature behavior and traffic feeds.
A virtualized interface has been divided into subinterfaces each of which consists of a group of VLANs.
virtualized sensing
You can associate a virtual sensor with one or more subinterfaces so that different intrusion prevention
interface
policies can be assigned to those subinterfaces. You can virtualize both physical and inline interfaces.
OL-24002-01
Cisco Intrusion Prevention System Appliance and Module Installation Guide for IPS 7.1
Glossary
GL-23