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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
• MCR: The minimum cell rate for a connection using this service type. This value is a percentage of
the PCR. 1000000 is equal to 100%. Range and Units: 0-1000000.
• ICR: Initial Cell Rate. The cell rate used to begin a transmission on a connection that has been idle
for a configured period of time. This value is a percentage of the PCR for the logical interface.
1000000 is equal to 100%. (Used only on ABR service type connections.) Range and Units:
0-1000000.
• MBS: The maximum number of cells that may arrive at a rate equal to the PCR. Used for policing.
Range and Units: 1-500000.
• MFS: Max Frame Size. The maximum AAL5 frame size in cells.
• CDVT: Cell Delay Variation Tolerance for the first leaky bucket.
• Packet Discard Mode: Enables or disables Packet Discard Mode on the connection. Range and units:
1=enabled; 2=disabled.
• Maximum Threshold: The VcMax Threshold for CLP (0+1) cells in microseconds. Range and units:
0-5000000 microseconds.
• CLP-HIGH: Cell Loss Priority High Threshold (% of VC QMax) is the highest threshold for the bit
in the header of an ATM cell that identifies the cell as eligible for discard within the network under
predefined congestion conditions. Most often set by the ingress policing function. Range and values:
0-1000000.
• CLP-LOW/EPD1: CLP (1) Low or EPDs (1): Cell Loss Priority Low Threshold (% of VC QMax)/
Early Packet Discard. If AAL5 FBTC = yes, then for the BXM card this is the EPD threshold setting.
EPDs is the lowest threshold for the bit in the header of an ATM cell that identifies the cell as eligible
for discard within the network under predefined congestion conditions.
• EPD0: Early Packet Discard Threshold. The maximum threshold for CLP (0+1) cells. This value is
a percentage of the MAX_CELL THRESH for the connection. 1000000 is equal to 100%. Range
and value: 0-1000000.
• EFCI: Explicit Forward Congestion Indication. The VC EFCI discard threshold. This value is a
percentage of MAX_CELL THRESH. 1000000 is equal to m100%. Range and values: 0-1000000.
• CoS Scaling: Class of Service Scaling provides a means of scaling through a set of extended
parameters, which are generally platform specific, based on a set of standard ATM parameters
passed to the VSI slave during connection set up.
• Interface Scaling: Allows the scaling and exchange of information between connections.
• CI Control: Congestion Indicator is a field in an RM-cell used to cause the source to decrease its
ACR (Allowed Cell Rate). The source sets CI =0 when it sends an RM cell. C=1indicats EFCI has
been received on a previous data cell.
• Cut-Off RM Cells: Allows for variations in the RM-cell.
• VSVD: Virtual Source/ Virtual Destination. A VSVD is an ABR connection which may be divided
into two or more separately controlled ABR segments. Each ABR control segment, except the first,
is sourced by a virtual source. Sources and destinations are linked via bi-directional connections,
and each connection termination point is both a source and a destination, a source for data that is
transmitting, and a destination for data that is receiving.
• ADTF: Allowed-cell-rate Decrease Time Factor/Initial-cell-rate Time-out. The time between RM
cells before the allowable cell rate returns to the initial cell rate.
• RDF: Rate Decrease Factor: An ABR service parameter that controls the decrease in cell
transmission rate.