96
C
HAPTER
4: P
ATH
B
UILDER
S600 M
ODULE
AND
A
PPLICATION
O
VERVIEW
Figure 60 shows three PathBuilder S600s configured to provide LAN connectivity
between three different LAN segments. This example is a simple configuration
which only uses 1 port on 1 Ethernet port card in each PathBuilder S600.
Figure 60
LAN Connectivity
Each Ethernet port will run Bridging (Learning) programs to determine if received
LAN packets should be passed to the WAN on a specific PVC. In the example
shown in Figure 60, multi-port bridging software will determine if packets will be
passed or dropped. When a packet comes in from LAN 1 port and the Bridge code
does not have the destination MAC address associated with one of its logical ports
(Ethernet, PVC #1, PVC #2), it will broadcast the packet on all PVCs attached with
this port. Once Packets are received from the WAN on specific PVC logical ports,
their source addresses will be learned and associated with the logical port. Once
you and your carrier have set up PVCs to all remote PathBuilder S600 Ethernet
ports, the Bridging code will do the rest. For further information on bridging, see
“Bridging” later in this chapter.
Frame Application
The QSIM/HSIM/FAM modules support 3 modes of Frame to Cell transit services:
n
DXI Mode 1A
n
Frame Relay Forum Specification 5 and 8; Service and Network Interworking
n
HDLC/SDLC
Each service is designed to support a different type of user application. However,
they all share the same ATM backbone characteristics. The QSIM/HSIM/FAM port
modules are mapped over ATM PVCs.
When you are connecting the PathBuilder S600 to an ATM network, verify that the
PVC mapping for in and out ports is defined for proper operation. See Figure 61.
DS3 UNI 1
Circuits Set Up by the Carrier
PVC
#1
#2
#3
END1
P1
P1
P2
VPI/VCI1
0/200
0/300
0/300
End2
P2
P3
P3
VPI/VCI2
0/100
0/100
0/200
Port P2
Port P3
Port P1
DS3 UNI 2
DS3 UNI 3
PVC
#1
#2
END1
LAN3
LAN3
END2
DS3
DS3
VPI/VCI
0/100
0/200
Conn To
LAN1
LAN2
Circuits Set Up on PathBuilder S600 #3
PVC
END1
END2
VPI/VCI
Conn To
#1
LAN2
DS3
0/100
LAN1
#2
LAN2
DS3
0/300
LAN3
Circuits Set Up on PathBuilder S600 #2
PVC
#1
#2
END1
LAN1
LAN1
END2
DS3
DS3
VPI/VCI
0/200
0/300
Conn To
LAN2
LAN3
Circuits Set Up on PathBuilder S600 #1
Forward and Reverse VCCs Match in
this Example. VCCs are Unidirectional.
Forward Known
Broadcast
Unknown
PathBuilder
S600 #1
PathBuilder S600 #3
LAN
2
PathBuilder S600 #2
PathBuilder S600
PathBuilder S600
PathBuilder S600
ATM
Switched
Network
LAN
3
Bridge
Table
LAN
1
Summary of Contents for 3C63100-AC-C - PathBuilder S600...
Page 8: ...INDEX 3COM CORPORATION LIMITED WARRANTY ...
Page 14: ...xiv CHAPTER SUPPLEMENTARY REGULATORY INFORMATION ...
Page 18: ...18 ABOUT THIS GUIDE ...
Page 28: ...28 CHAPTER 1 SYSTEM DESCRIPTION ...
Page 74: ...74 CHAPTER 3 GETTING STARTED ...
Page 230: ...230 INDEX ...