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Cisco WAN Manager User’s Guide
Version 10.5, Part Number 78-12945-01 Rev. D0, August 2003
Chapter 7 Service Class Template Manager
Functional Interaction
• Explicit Rate Sampling: Indicates whether Explicit Rate Sampling (ERS) is enabled or disabled.
Range and units: 1=enabled; 2=disabled.
• Random Early Discard Selection(RED): RED will drop packets from queues on a random basis in
order to avoid buffer overflow. RED is accomplished by dropping packets on a random basis, which
is determined statistically, when the mean queue depth exceeds a threshold over a period of time,
effectively advising the packet source router to decrease its packet rate.
• RED Threshold: Random Early Discard Threshold: The threshold at which the COSB Random Early
Discard (RED) is activated. This threshold is a percentage of the MAX_CELL THRESH for the
connection. 1000000 is equal to 100%. Range and units: 0-1000000.
• RED Probability: Random Early Discard Probability Factor: The mantissa value of probability for
maximum discard when RED is activated. Determined as 1/2^<value>.
• WFQ: Weighted Fair Queuing. WFQ queues traffic in separate queues, according to traffic class
definition, guaranteeing each queue some portion of the total available bandwidth. WFQ recognizes
when a particular queue is not fully utilizing its allocated bandwidth and portions that capacity out
to the other queues on a proportionate basis. This is done by portioning out available bandwidth on
the basis of individual information flows according to their message parameters.
• Best Effort: A Quality of Service Class in which no specific traffic parameters and no absolute
guarantees are provided. Best Effort includes UBR and ABR Service Types.
• Discard Alarm Enable: Indicates whether Discard Alarm has been enabled or disabled. Range and
units: 1=enabled; 2=disabled.
• Discard Alarm Threshold: Indicates the Discard Alarm Threshold.
• Cell Loss Ratio: A negotiated Quality of Service parameter in an ATM network. This parameter
indicates a ratio of lost cells to total transmitted cells.
Each tab displays parameters in table format, with the above criteria and its associated data presented in
each column of a given table. Each row represents a unique Service Type, including: ABR, CBR, UBR,
VBR and VSI Signal.
By selecting a row on the table, the corresponding CoSB parameters are also displayed in the bottom
CoSB panel.
Except for Service Type and Service Category columns, most columns under each VC tab have drop
down boxes which allow authorized users to edit and modify cells as needed.
Cells are editable and can be changed ONLY if both of the following conditions are met:
• The user has security permissions to configure SCT files, and
• The SCT file is not downloaded and/or not associated
CoSB Panel
The CoSB panel displays CoSB parameters by CoSB Number. The data in this panel reflects the row
selection of the table on the VC or top panel. These parameters are currently organized into three groups:
Rate & Priority, Threshold, and Miscellaneous.
In the Rate & Priority category, the following parameters can be modified:
• Minimum Rate: The minimum rate at which this COSB will be serviced in order to guarantee its
minimum and maximum bandwidth requirements.
• Maximum Rate: The minimum rate at which this COSB will be serviced in order to guarantee its
minimum and maximum bandwidth requirements.