Virtual Circuit Parameters; Atm Module Virtual Circuit Parameters - 3Com 3C63100-AC-C - PathBuilder S600 Bridge/router Reference Manual

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HAPTER ONFIGURING
Virtual Circuit
Parameters
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ATH UILDER ODULES
The following subsections describe the parameters you must enter when you
configure virtual circuits for different card types.
The parameters that you will actually see during configuration will depend on the
circuit type and the card type of your configuration. Also, some of the parameters
will appear on either side A or side B.

ATM Module Virtual Circuit Parameters

The following parameters are available for the E3 UNI, DS3 UNI, OC3/STM-1 UNI,
DS1 UNI with IMA, and E1 UNI with IMA cards.
For descriptions of the virtual circuit parameters for the MCPU card, see
"Configuring In-band Management" in Chapter 3.
Group—The IMA group number (if applicable).
Receive VPI—The VPI of cells received.
Receive VCI—The VCI of cells received.
Transmit VPI—The transmit VPI of cells transmitted.
Transmit VCI—The transmit VCI of cells transmitted.
Virtual Interface—Side A (or B) Virtual Interface number.
Priority—The priority for this circuit: 0, 1, 2, or 3. The STX supports four priority
queues per virtual interface, and each virtual circuit can be mapped to a priority
queue. Priority 0 is the highest.
Early Packet Discard—Enable or disable EPD for use with the Congestion On/Off
setting. See "Configuring the STX Module" for details. For every connection
where early packet discard is enabled, a status is kept when there is a partial
packet for that connection in the queue. Once the queue cell level exceeds the
congestion ON thresholds, only connections with partial packets already existing in
the queue are allowed in. Cells from other connections are dropped.Once the
congestion has subsided to the congestion OFF level, then all remaining
connections are allowed.
Policing—Select [0] to disable, [1] to choose Config. 1, or [2] to choose Config. 2.
If you select Config. 1, the following occurs:
For CBR traffic, CLP=0 cells are policed and non-conforming CLP=0 cells are
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tagged. CLP=1 cells are not policed. The policing for CBR traffic is based on
PCR and CDVT.
For non-CBR traffic, CLP=0 cells are policed, SCR is enforced, and
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non-conforming CLP=0 cells are tagged. Additionally, CLP=0+1 (all cells) are
policed, and PCR is enforced such that any cells exceeding PCR are discarded.
The policing for non-CBR traffic is based on PCR, SCR, and MBS.
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ORTS AND PPLICATIONS