3Com SuperStack II PathBuilder S330 Reference Manual page 264

256 A B: P B
PPENDIX ATH UILDER
S330/S310 M A
ODULE AND PPLICATION
Figure 184 shows three PathBuilder S330 switches 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 switch to another port on another PathBuilder S330
switch.
Figure 184 ATM Bridging
VP0/200
VP0/250
Ethernet Bridge VP0/200
Port VP0/250
n x T1 or
n x E1
PathBuilder S330/S310 A
Note that the numbers given for these circuits by the carrier are local to one
PathBuilder S330 switch and have no global significance. For example, VCC
number 0/100 is used on two different PathBuilder S330 switches to mean two
different circuits. The carrier will assign each PathBuilder S330 switch at each
location any number of circuits to connect the Ethernet port of each PathBuilder
S330 switch to the Ethernet port of any other PathBuilder S330 switch.
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 switch with 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 switch to transmit to, and receive from, another location.
The PVCs are provisioned by the carrier for use on each PathBuilder S330/S310
switch. These PVCs are entered in circuit tables within each PathBuilder S330/S310
switch. After the circuits are built, the bridge can use this information to send ATM
cells to remote sites.
The PathBuilder S330/S310 switch supports a maximum of 1000 VCs. You first
configure each PathBuilder S330/S310 switch 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.
O
VERVIEW
Forward Table
MAC Address
ATM
02608C456123
02608C123456
ATM
Network
PathBuilder
S330/S310 B
02608C456123
PathBuilder
S330/S310 C
02608C123456