146
C
HAPTER
4: C
ONFIGURING
P
ATH
B
UILDER
S330/S310 M
ODULES
, P
ORTS
,
AND
A
PPLICATIONS
At PathBuilder S330 B (S330 B)
:
■
Add a virtual circuit (VC 1) between S330 B and S330 A.
■
Add four subchannel circuits to VC 1, setting these VCM circuit parameters:
■
DS0: 1-4
■
DLCI:16
■
SCID: 11-14
At PathBuilder S330 C (S330 C)
:
■
Add a virtual circuit (VC 2) between S330 C and S330 A.
■
Add four subchannel circuits to VC 2, setting these VCM circuit parameters:
■
DS0: 1-4
■
DLCI:17
■
SCID: 11-14
Virtual Circuit
Parameters
The following subsections describe parameters you must enter when you
configure virtual circuits for different port types.
Common VIrtual Circuit Parameters
The following parameters are common to most port types:
Slot/Port or Group/Card
— The slot number, port or IMA group number, and
card type.
Shaper Number
— The number corresponding to the SAR shaper you want to
assign to this circuit. You define the fifteen available shapers from the MCPU
Shapers screen. See “Configuring MCPU Shapers” earlier in this chapter, for
details.
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. 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.
CAUTION:
Do not enable early packet discard for AAL1 traffic.
MCPU Virtual Circuit Parameters
IP Address
— The IP address for the PathBuilder S330/S310 switch. If you do not
enter 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 the
ATM link: Routed PDUs or Bridged PDUs. When configuring inband circuits, you
must set both the near and the far ends to the same
IP Encapsulation
type.
