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Cisco WAN Manager User’s Guide
Version 10.5, Part Number 78-12945-01 Rev. D0, August 2003
Chapter 4 Connection Manager
PVC Connections Supported by Release 10 of CWM
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Initial Cell Rate (ICR): 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.
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Max Burst Size(MBS): The maximum number of cells that may arrive at a rate equal to the PCR.
Used for policing. Range and Units: 1-5000000.
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Max Frame Size(MFS): The maximum AAL5 frame size in cells.
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Cell Delay Variation Tolerance(CDVT): Specifies the transmit/receive Cell Delay Variation
Tolerance for the second leaky bucket. The second bucket applies to cells with CLP(0). CDVT
is the maximum time for accumulated violations of cell-arrival time parameters.
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VC Packet Discard Mode: Enables or disables Packet Discard Mode on the connection. Range
and units: 1=enabled; 2=disabled.
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Max Threshold: The VcMax Threshold for CLP (0+1) cells in microseconds. Range and units:
0-5000000 microseconds.
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CLP (1) High Threshold: 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.
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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.
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EPD Threshold: 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.
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EFCI Threshold: 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.
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Class of Service 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.
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CI Control: Congestion Indication Control. Indicates whether the EFCI Threshold has been
exceeded.
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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.
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ACR Decrease Time Factor: Allowed Cell Rate Decrease Time Factor. Sets the Decrease Time
Factor for the VC queue service rate being used on an ABR connection.
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ABR Rate Decrease Factor: Available Bit Rate-Rate Decrease Factor. Sets the Rate Decrease
Factor on an ABR variable rate ATM service type utilizing the ForeSight algorithm for
congestion avoidance.
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Rate Increase Factor(RIF): A percentage increase in the allowable cell rate for an ABR
connection if the BRM cells do not have the N1 or C1 bits set.
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Number of Data Cells Between FRM Cells