K-65
User Guide for Cisco Security Manager 3.2
OL-16066-01
AppendixK Router Platform User Interface Reference
PVC Policy Page
Traffic Shaping settings
Traffic Shaping The type of service to define on the PVC:
•[null]—The bit rate is not defined.
•ABR—Available Bit Rate. A best-effort service suitable for applications
that do not require guarantees against cell loss or delays.
•CBR—Constant Bit Rate service. Delay-sensitive data, such as voice or
video, is sent at a fixed rate, providing a service similar to a leased line.
•UBR—Unspecified Bit Rate service. A best-effort service suitable for
applications that are tolerant to delay and do not require realtime
responses.
•UBR+—Unspecified Bit Rate service. Unlike UBR, UBR+ attempts to
maintain a guaranteed minimum rate.
•VBR-NRT—Variable Bit Rate - Non-Real Time service. A service
suitable for non-realtime applications that are bursty in nature. VBR is
more efficient than CBR and more reliable than UBR.
•VBR-RT—Variable Bit Rate - Real Time service. A service suitable for
realtime applications that are bursty in nature.
For more information about each service class, see Understanding ATM
Service Classes, page 15-48.
ABR The following fields are displayed when ABR is selected as the Bit Rate:
•PCR—The peak cell rate in kilobits per second (kbps). It specifies the
maximum value of the ABR.
•MCR—The minimum cell rate in kilobits per second (kbps). It specifies
the minimum value of the ABR.
The ABR varies between the MCR and the PCR. It is dynamically controlled
using congestion control mechanisms.
CBR The following field is displayed when CBR is selected as the Bit Rate:
•Rate—The constant bit rate (also known as the average cell rate) for the
PVC in kilobits per second (kbps). An ATM VC configured for CBR can
send cells at this rate for as long as required.
TableK-27 PVC Dialog Box—QoS Tab (Continued)