Configuring Virtual Circuits - 3Com 3C63100-AC-C - PathBuilder S600 Bridge/router Reference Manual

170 C 5: C
HAPTER ONFIGURING
Configuring Virtual
Circuits
P B S600 M
ATH UILDER ODULES
You must take the card out of service before you can change any configuration
settings.
d Set the following parameter as desired:
Max. Frame Size—The maximum frame size supported by the serial card:
2KB, 4KB, or 8KB. This value must match the maximum frame size for the
device interface to which the PathBuilder S600 is being connected. For
example, if the maximum frame size being transmitted to the PathBuilder S600
QSIM from a Frame Relay Access Device (FRAD) is 4KB, then you must set the
Maximum Frame Size for the QSIM/HSIM card to 4KB.
If you change the Max. Frame Size setting, you will have to reboot the system.
For information about QSIM, HSIM, and FAM performance at small frame sizes,
see "QSIM/HSIM/FAM Performance at Small Frame Sizes" earlier in this section.
e Return to the QSIM, HSIM, or FAM Configuration menu.
2 Configure input shapers for the QSIM/HSIM/FAM card.
a Select [6] Shaper Configuration ([10] Shaper Configuration on the FAM menu)
to open the QSIM, HSIM, or FAM Shapers screen. This screen is the same as the
MCPU Shapers screen, shown earlier in this chapter in Figure 86.
b Set the following input shaper parameters for the QSIM, HSIM, or FAM card:
Peak Cell Rate (PCR)
n
Sustained Cell Rate (SCR)
n
Maximum Burst Size (MBS)
n
For detailed instructions about configuring input shapers, see "Configuring
Input Shapers" earlier in this chapter.
c Return to the QSIM, HSIM, or FAM Configuration menu.
3 Configure virtual interfaces for the QSIM, HSIM, or FAM card.
a Select [7] Virtual Interfaces ([11] Virtual Interfaces on the FAM menu) to open
the QSIM, HSIM, or FAM Virtual Interfaces Configuration menu. This menu is
the same as the MCPU Virtual Interfaces menu, shown earlier in Figure 83.
b Configure virtual interfaces as described under "Configuring Virtual Interfaces"
earlier in this chapter. You configure virtual interfaces for the QSIM, HSIM, or
FAM card in the same way that you configure virtual interfaces for the MCPU
card, except that you can configure 24 VIs total for the QSIM, HSIM, or FAM
card, as opposed to 2 for the MCPU card.
Once you have configured the PathBuilder S600's modules and ports, you can start
setting up virtual circuits. A virtual circuit is a bidirectional path between data ports
of connecting ATM units. You should have a circuit plan developed in advance.
You define a virtual circuit at the connecting units by assigning it a Virtual Path
Identifier (VPI) and a Virtual Channel Identifier (VCI) for each direction of
transmission. A virtual path is an aggregate collection of virtual channels for the
purpose of assigning the channels to a single physical layer. A virtual channel is a
connection between data ports. You can connect one or more virtual circuits to a
data port by assigning each a different VPI and VCI. The VPI and VCI numbers are
normally assigned as a pair: VPI/VCI.
, P , A
ORTS AND PPLICATIONS