3Com 3C63502A-NC Reference Guide - Page 264

256 APPENDIX B: PATHBUILDER S330/S310 MODULE AND APPLICATION OVERVIEW 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 Forward Table ATM MAC Address VP0/200 02608C456123 VP0/250 02608C123456 Ethernet Bridge VP0/200 Port VP0/250 n x T1 or n x E1 ATM Network PathBuilder S330/S310 A PathBuilder S330/S310 B 02608C456123 PathBuilder S330/S310 C 02608C123456 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.