146 CHAPTER 4: CONFIGURING PATH BUILDER S330/S310 MODULES , PORTS , AND APPLICATIONSAt PathBuilder S330 B (S330 B):n Add a virtual circuit (VC 1) between S330 B and S330 A.n Add four subchannel circuits to VC 1, setting these VCM circuit parameters:n DS0: 1-4n DLCI:16n SCID: 11-14At PathBuilder S330 C (S330 C):n Add a virtual circuit (VC 2) between S330 C and S330 A.n Add four subchannel circuits to VC 2, setting these VCM circuit parameters:n DS0: 1-4n DLCI:17n SCID: 11-14Virtual CircuitParametersThe following subsections describe parameters you must enter when youconfigure virtual circuits for different port types.Common VIrtual Circuit ParametersThe following parameters are common to most port types:Slot/Port or Group/Card — The slot number, port or IMA group number, andcard type.Shaper Number — The number corresponding to the SAR shaper you want toassign to this circuit. You define the fifteen available shapers from the MCPUShapers screen. See “Configuring MCPU Shapers” earlier in this chapter, fordetails.Priority — The priority level: high or low (MCPU, OC3/STM-1, QSIM/HSIM/FAM,Ethernet, CBR, VCM); high, medium, low1, or low2 (T1/E1 UNI).Early Packet Discard — Enables (yes) or disables (no) early packet discard. Forevery connection where early packet discard is enabled, a status is kept whenthere is a partial packet for that connection in the queue. Once the queue cell levelexceeds the Congestion On thresholds, only connections with partial packetsalready existing in the queue are allowed in. Cells from other connections aredropped. Once the congestion has subsided to the Congestion Off level, then allremaining connections are allowed.CAUTION: Do not enable early packet discard for AAL1 traffic.MCPU Virtual Circuit ParametersIP Address — The IP address for the PathBuilder S330/S310 switch. If you do notenter a value for this parameter, the interface will not be added to the IP stack.Subnet Mask — The subnet mask for the PathBuilder S330/S310 switch.IP Encapsulation — The encapsulation type used for sending IP packets over theATM link: Routed PDUs or Bridged PDUs. When configuring inband circuits, youmust set both the near and the far ends to the same IP Encapsulation type.
