3com S330 ユーザーズマニュアル
CBR Module
231
Each PVC represents the logical circuit being used to connect one PathBuilder
S330/S310 port to a remote PathBuilder S330/S310 port. Once you have entered
all PVCs, the bridge will learn the network addresses for the local and remote sites
and start bridging packets to the correct destination by segmenting the packets
into cells which are destined to a remote PathBuilder S330/S310 port. See
Figure 168. The ATM network will transport the cells according to the VPI/VCI
headers.
S330/S310 port to a remote PathBuilder S330/S310 port. Once you have entered
all PVCs, the bridge will learn the network addresses for the local and remote sites
and start bridging packets to the correct destination by segmenting the packets
into cells which are destined to a remote PathBuilder S330/S310 port. See
Figure 168. The ATM network will transport the cells according to the VPI/VCI
headers.
Figure 169 shows three PathBuilder S330s configured to provide LAN connectivity
between three different LAN segments. 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 above example, 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 associated with this port.
between three different LAN segments. 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 above example, 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 associated 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 S330/S310 Ethernet
ports, the Bridging code will do the rest.
source addresses will be learned and associated with the logical port. Once you
and your carrier have set up PVCs to all remote PathBuilder S330/S310 Ethernet
ports, the Bridging code will do the rest.
Figure 169 LAN Connectivity
CBR Module
The optional T1-DSX/E1 CBR module provides three T1-DSX or E1 ports (one on
the PathBuilder S310) and one serial port. This module services traffic generated
by your existing PBXs, channels, T1/E1 multiplexers, CSU/DSUs, and video
conferencing devices. This service maps the T1-DSX/E1 service through the AAL1
adaptation layer over a CBR virtual channel connection (VCC). The VCC is
established as a permanent virtual circuit (PVC) and mapped from the PathBuilder
S330/S310’s ATM port to another PathBuilder S330/S310 or an ATM Forum circuit
emulation compliant device.
the PathBuilder S310) and one serial port. This module services traffic generated
by your existing PBXs, channels, T1/E1 multiplexers, CSU/DSUs, and video
conferencing devices. This service maps the T1-DSX/E1 service through the AAL1
adaptation layer over a CBR virtual channel connection (VCC). The VCC is
established as a permanent virtual circuit (PVC) and mapped from the PathBuilder
S330/S310’s ATM port to another PathBuilder S330/S310 or an ATM Forum circuit
emulation compliant device.
LAN
1
LAN
2
LAN
3
DS3 UNI 1
Circuits Set Up by the Carrier
PVC
#1
#2
#3
#2
#3
END1
P1
P1
P2
P1
P2
VPI/VCI1
0/200
0/250
0/250
0/250
0/250
End2
P2
P3
P3
P3
P3
VPI/VCI2
0/100
0/100
0/200
0/100
0/200
Port P2
Port P3
Port P1
DS3 UNI 2
DS3 UNI 3
Bridge
Table
Forward Known
Broadcast
Unknown
PathBuilder
S330/S310 #2
PathBuilder
S330/S310 #1
PathBuilder
S330/S310 #3
ATM
Switched
Network