Cisco 10000 Series Configuration Manual page 824

Glossary
O
A method of improving network utilization by assigning a committed rate that is greater than the speed
oversubscription
of an interface or subinterface, or greater than the capacity of a VC port.
P
A QoS policy that defines the shape rate for the child traffic on an interface. The parent policy contains
parent policy
only the class-default class; it can contain no other classes.
See peak cell rate.
PCR
Parameter defined by the ATM Forum for ATM traffic management.
peak cell rate
Virtual circuit that is permanently established. PVCs save bandwidth associated with circuit
permanent virtual
circuit establishment and tear down in situations where certain virtual circuits must exist all the time. In ATM
terminology, called a permanent virtual connection. See also virtual circuit (VC).
A virtual path that consists of PVCs.
permanent virtual
path
The successor to SLIP, Point-to-Point Protocol (PPP) provides router-to-router and host-to-network
Point-to-Point
Protocol connections over both synchronous and asynchronous circuits.
With point-to-point subinterfaces, each pair of routers has its own subnet. If you put the PVC on a
point-to-point
point-to-point subinterface, the router assumes that there is only one point-to-point PVC configured on
subinterface
the subinterface. Therefore, any IP packets with a destination IP address in the same subnet are
forwarded on this VC. This is the simplest way to configure the mapping and is, therefore, the
recommended method.
A traffic regulation mechanism that is used to limit the rate of traffic streams. Policing allows you to
policing
control the maximum rate of traffic sent or received on an interface. Policing propagates bursts of traffic
and is applied to the inbound or outbound traffic on an interface. When the traffic rate exceeds the
configured maximum rate, policing drops or remarks the excess traffic.
A modular CLI (MQC) element that enables you to create QoS policies to tell the router the QoS actions
policy map
and rules to apply to packets belonging to a particular traffic class.
See Point-to-Point Protocol.
PPP
PPP over ATM. Enables a high-capacity central site router with an Asynchronous Transfer Mode
PPPoA
(ATM) interface to terminate multiple remote PPP connections.
PPP over Ethernet. Allows a PPP session to be initiated on a simple bridging Ethernet connected client.
PPPoE
Refers to a signaling protocol defined within PPPoE as well as the encapsulation method. See also
RFC 2516.
PPP over Ethernet over ATM. Allows tunneling and termination of PPP sessions over Ethernet links
PPPoEoA
and allows for Ethernet PPP connections over ATM links.
PPP over Ethernet over on Ethernet. Allows tunneling and termination of PPP sessions over Ethernet
PPPoEoE
links and allows for Ethernet PPP connections over Ethernet links.
Cisco 10000 Series Router Quality of Service Configuration Guide
GL-6
OL-7433-09