230 APPENDIX B: PATHBUILDER S330/S310 MODULE AND APPLICATION OVERVIEW
Figure 168 shows three PathBuilder S330s connected through a carrier ATM
network or a private switch. The ATM switch or network should be configured
with Permanent Virtual Circuits (PVCs) connecting one LAN or Ethernet port on
one PathBuilder S330 to another port on another PathBuilder S330.
Figure 168 ATM Bridging
Note that the numbers given for these circuits by the carrier are local to one
PathBuilder S330 and have no global significance. For example, VCC number
0/100 is used on two different PathBuilder S330s to mean two different circuits.
The carrier will assign each PathBuilder S330 at each location any number of
circuits to connect each PathBuilder S330 Ethernet port to any other PathBuilder
S330 Ethernet port.
The connections in the carrier network are shown for illustration only. The figure
shows an example for an ATM switch configuration. Note that the VCC numbers
get translated by the ATM switch since they have local meaning only for every
switch port. For example, at the #1 location, the carrier would provide the
PathBuilder S330 four VCCs for the forward and reverse path to connect to LAN2
and LAN3 respectively.
VCCs are unidirectional and, therefore, two VCCs are designated on a port of a
PathBuilder S330/S310 to transmit to, and receive from, another location.
The PVCs are provisioned by the carrier for use on each PathBuilder S330/S310.
These PVCs are entered in circuit tables within each PathBuilder S330/S310. After
the circuits are built, the bridge can use this information to send ATM cells to
remote sites.
The PathBuilder S330/S310 will support a maximum of 1000 VCs. You first
configure each PathBuilder S330/S310 with the PVC information by using screens
which prompt you to input specific information about each Permanent Virtual
Circuit. See “Configuring Virtual Circuits” in Chapter 4, for details. These PVCs are
tied to a specific PathBuilder S330/S310 port (the Ethernet port). The PathBuilder
S330/S310 Ethernet port can have several PVCs associated with it.
Ethernet
Port
Bridge VP0/200
VP0/250
n x T1 or
VP0/200
VP0/250
02608C456123
02608C123456
ATM
MAC Address
Forward Table
ATM
Network
PathBuilder S330/S310 A
02608C123456
02608C456123
PathBuilder
S330/S310 C
PathBuilder
S330/S310 B
n x E1
