features include least-cost routing, ECMP (Equal Cost Multi Paths) routing, and load balancing. Although
OSPF requires CPU power and memory space, it results in smaller, less frequent router table updates
throughout the network. This protocol is more ecient and scalable than vector-distance routing
protocols.
PCP
The Priority Code Point is a 3-bit field that stores the priority-level for the 802.1Q frame. It is also known
as User Priority.
PDU
A Protocol Data Unit is a message of a given protocol comprising payload and protocol-specific control
information, typically contained in a header.
PEAP
Protected Extensible Authentication Protocol is an IETF (Internet Engineering Task Force) draft standard
to authenticate wireless LAN clients without requiring them to have certificates. In PEAP authentication,
first the user authenticates the authentication server, then the authentication server authenticates the
user. If the first phase is successful, the user is then authenticated over the SSL tunnel created in phase
one using EAP-Generic Token Card (EAP-GTC) or Microsoft Challenged Handshake Protocol Version 2
(MSCHAP V2). (See also EAP-TLS/EAP-TTLS.)
PoE
The Power over Ethernet standard (IEEE 802.3af) defines how power can be provided to network
devices over existing Ethernet connections, eliminating the need for additional external power supplies.
PVST+
Per VLAN Spanning Tree +. This implementation of STP (Spanning Tree Protocol) has a 1:1 relationship
with VLANs. The Extreme Networks implementation of PVST+ allows you to interoperate with third-
party devices running this version of STP. PVST is a earlier version of this protocol and is compatible
with PVST+.
QL
QL In SyncE this is the Quality Level of a given clock source. This is received on a port in a SSM
indicating the quality of the clock received in the port.
QoS
Quality of Service is a technique that is used to manage network resources and guarantee a bandwidth
relationship between individual applications or protocols. A communications network transports a
multitude of applications and data, including high-quality video and delay-sensitive data such as real-
time voice. Networks must provide secure, predictable, measurable, and sometimes guaranteed
services. Achieving the required QoS becomes the secret to a successful end-to-end business solution.
RADIUS
RADIUS is a client/server protocol and software that enables remote access servers to communicate
with a central server to authenticate dial-in users and authorize their access to the requested system or
service. RADIUS allows a company to maintain user profiles in a central database that all remote servers
can share. It provides better security, allowing a company to set up a policy that can be applied at a
single administered network point. With RADIUS, you can track usage for billing and for keeping
network statistics.
Glossary
ISW Series Managed Industrial Ethernet Switch Command Reference Guide 162
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