Application Overview
95
Note that the numbers given for these circuits by the carrier are local to one
PathBuilder S600 and have no global significance. For example, VCC number
0/100 is used on two different PathBuilder S600s to mean two different circuits.
The carrier will assign each PathBuilder S600 at each location any number of
circuits to connect each PathBuilder S600 Ethernet port to any other PathBuilder
S600 Ethernet port desired.
The connections in the carrier network are shown for illustration only. Figure 59
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, the carrier would provide the PathBuilder S600 at the #1
location, four VCCs for the forward and reverse path to connect respectively to
LAN2 and LAN3. VCCs are unidirectional; therefore, two VCCs are designated on
a port of an PathBuilder S600 to transmit to, and receive from, another location.
The PVCs are provisioned by the carrier for use on each PathBuilder S600. These
PVCs are entered in circuit tables within each PathBuilder S600. After these circuits
are built the bridge can use this information to send ATM cells to remote sites.
The PathBuilder S600 supports a maximum of 768 VCs. You first configure each
PathBuilder S600 with the PVC information using menus that prompt you to input
specific information about each Permanent Virtual Circuit. See “Configuring
Virtual Circuits” in Chapter 5, for details.
These PVCs are tied to specific PathBuilder S600 ports (Ethernet slot 4, port 1).
You can associate several PVCs associated to one PathBuilder S600 port. Each PVC
represents the logical circuit being used to connect one PathBuilder S600 port to a
remote PathBuilder S600 port.
Once you have entered all PVCs, the bridge learns the network addresses for the
local and remote sites and starts bridging packets to the correct destination by
segmenting the packets into cells which are destined to a remote PathBuilder
S600 port. See Figure 59. The ATM network will transport the cells according to
the VPI/VCI headers.
Figure 59
ATM Bridging
PathBuilder S600 B
Ethernet
Port
Bridge
VP0/200
VP0/300
DS3
UNI
VP0/200
VP0/300
02608C456123
02608C123456
ATM
MAC Address
Forward Table
ATM
Network
PathBuilder S600 A
02608C123456
02608C456123
PathBuilder S600 C
PathBuilder S600
PathBuilder S600
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