Cisco MGX 8850 Installation And Configuration Manual page 235

Parameter/Prompt
Flow Control External
Segments
SCR
MBS
Policing
VC QDepth
CLP Hi
CLP Lo/EPD
EFCI
ICR
IBR
ADTF (ATM Forum TM
4.0 term)
Trm (ATM Forum TM 4.0
term)
RIF (ATM Forum TM 4.0
term)
RDF (ATM Forum TM 4.0
term)
Nrm (ATM Forum TM 4.0
term)
FRTT (ATM Forum TM
4.0 term)
TBE (ATM Forum TM 4.0
term)
PCR
Description
Enables Cisco WAN switches to perform flow control on external segments (on the
CPE, for example) in addition to the Cisco WAN Switching segments.
Sustainable Cell Rate: the long-term limit on the rate that a connection can sustain.
Maximum Burst Size: the maximum number of cells that can burst at the PCR and still
be compliant. MBS is used to determine the Burst Tolerance (BT), which controls the
time period over which the SCR is policed.
(see Table D-3, "Traffic Policing Definitions").
The depth of the queue VC QDepth.
Cell Loss Priority Hi threshold (% of VC QDepth). When the high threshold is
exceeded, the node discards cells with CLP=1 until the number of cells in the queue
drops below the level specified by CLP Lo/EPD.
Cell Loss Priority Low threshold (% of VC QDepth)/Early Packet Discard. When the
number of cells in the queue drops below the level specified by CLP Lo/EPD, the node
stops discarding cells with CLP=1.
If the card is a BXM and AAL5 FBTC=yes, the percent of VC QMax equals the value
of EPD. Frame-based Traffic Control (FBTC) is FGCRA for AAL5.
For an ASI card, the percent of VC QMax is CLP Lo regardless of the FBTC setting.
Explicit Forward Congestion Indication threshold (% of VC QDepth).
Initial Cell Rate: the rate at which a source initially transmits after an idle period.
Initial Burst Size: the maximum burst size a source can initially transmit after an idle
period. IBR applies to only BXM cards.
The Allowed-Cell-Rate Decrease Factor.
Time permitted between sending RM-cells before the rate is decreased to ICR. (In
previous software releases, ADTF was ICR TO—Initial Cell Rate Time Out.)
An upper bound on the time between forward RM-cells for an active source: an RM cell
must be sent at least every Trm milliseconds. (In previous software releases, Trm was
Min. Adjust.)
Rate Increase Factor: controls the amount by which the cell transmission rate may
increase upon receipt of an RM cell. (In previous software releases, RIF was Rate Up.)
Rate Decrease Factor: controls the amount decrease in cell transmission rate when an
RM cell arrives. (In previous software releases, RDF was Rate Down.)
Nrm.
Maximum number of cells a source may send for each forward RM cell: an RM cell
must be sent for every Nrm–1 data cells.
Fixed Round Trip Time: the sum of the fixed and propagation delays from the source to
a destination and back.
Transient Buffer Exposure
The negotiated number of cells that the network would like to limit the source to
sending during start-up periods, before the first RM-cell returns.
Peak cell rate: the cell rate which the source may never exceed.
Switch Commands That Apply to the MGX 8850 Node D-9
addcon (ATM)