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98
C
HAPTER
4: P
ATH
B
UILDER
S700 M
ODULE
AND
A
PPLICATION
O
VERVIEW
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
S700 port. See Figure 61. The ATM network will transport the cells according to
the VPI/VCI headers.
Figure 62 shows three PathBuilder S700s 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 S700.
Figure 62
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 62, 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 S700 Ethernet
ports, the Bridging code will do the rest. For further information on bridging, see
“Bridging” later in this chapter.
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 S700 #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 S700 #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 S700 #1
Forward and Reverse VCCs Match in
this Example. VCCs are Unidirectional.
Forward Known
Broadcast
Unknown
PathBuilder
S700 #1
PathBuilder S700 #3
LAN
2
PathBuilder S700 #2
ATM
Switched
Network
LAN
3
Bridge
Table
LAN
1
PathBuilder S700
PathBuilder S700
PathBuilder S700
Содержание 3C63400-3AC-C - PathBuilder S700 Switch
Страница 14: ...xiv CHAPTER SUPPLEMENTARY REGULATORY INFORMATION ...
Страница 18: ...4 ABOUT THIS GUIDE ...
Страница 28: ...14 CHAPTER 1 SYSTEM DESCRIPTION ...
Страница 88: ...74 CHAPTER 3 GETTING STARTED ...
Страница 260: ...246 CHAPTER 6 PATHBUILDER S700 DIAGNOSTICS AND PERFORMANCE MONITORING ...
Страница 270: ...256 INDEX ...