Frame Application - 3Com 3C63100-AC-C - PathBuilder S600 Bridge/router Reference Manual

96 C 4: P B
HAPTER ATH UILDER

Frame Application

S600 M A
ODULE AND PPLICATION
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
PVC
Bridge
Forward Known
Table
LAN
DS3 UNI 1
1
Broadcast
Unknown
PathBuilder
S600 #1
Circuits Set Up on PathBuilder S600 #1
PVC END1 END2 VPI/VCI
#1 LAN1 DS3 0/200
#2 LAN1 DS3 0/300
Forward and Reverse VCCs Match in
this Example. VCCs are Unidirectional.
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.
The QSIM/HSIM/FAM modules support 3 modes of Frame to Cell transit services:
DXI Mode 1A
n
Frame Relay Forum Specification 5 and 8; Service and Network Interworking
n
HDLC/SDLC
n
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.
O
VERVIEW
Circuits Set Up on PathBuilder S600 #2
END1 END2 VPI/VCI
#1 LAN2 DS3 0/100
#2 LAN2 DS3 0/300
ATM
Switched
Network
Port P1
Circuits Set Up by the Carrier
PVC END1 VPI/VCI1
#1 P1 0/200
#2 P1 0/300
#3 P2 0/300
Conn To
LAN2
LAN3
PathBuilder S600 #2
Conn To
LAN1
LAN3
DS3 UNI 2
Port P2
Port P3
End2 VPI/VCI2
DS3 UNI 3
P2 0/100
P3 0/100
P3 0/200
PathBuilder S600 #3
Circuits Set Up on PathBuilder S600 #3
PVC END1 END2 VPI/VCI
#1 LAN3 DS3 0/100
#2 LAN3 DS3 0/200
LAN
2
LAN
3
Conn To
LAN1
LAN2