Siemens S323 User Manual
User Manual UMN:CLI
SURPASS hiD 6615 S223/S323 R1.5
SURPASS hiD 6615 S223/S323 R1.5
A50010-Y3-C150-2-7619 179
8.1.1 Port-Based
VLAN
The simplest implicit mapping rule is known as port-based VLAN. A frame is assigned to a
VLAN based solely on the switch port on which the frame arrives. In the example de-
picted in Figure, frames arriving on ports 1 through 4 are assigned to VLAN 1, frame from
ports 5 through 8 are assigned to VLAN 2, and frames from ports 9 through 12 are as-
signed to VLAN 3.
VLAN based solely on the switch port on which the frame arrives. In the example de-
picted in Figure, frames arriving on ports 1 through 4 are assigned to VLAN 1, frame from
ports 5 through 8 are assigned to VLAN 2, and frames from ports 9 through 12 are as-
signed to VLAN 3.
Stations within a given VLAN can freely communicate among themselves using either
unicast or multicast addressing. No communication is possible at the Data Link layer be-
tween stations connected to ports that are members of different VLANs. Communication
among devices in separate VLANs can be accomplished at higher layers of the architec-
ture, for example, by using a Network layer router with connections to two or more VLANs.
unicast or multicast addressing. No communication is possible at the Data Link layer be-
tween stations connected to ports that are members of different VLANs. Communication
among devices in separate VLANs can be accomplished at higher layers of the architec-
ture, for example, by using a Network layer router with connections to two or more VLANs.
Multicast traffic, or traffic destined for an unknown unicast address arriving on any port,
will be flooded only to those ports that are part of the same VLAN. This provides the de-
sired traffic isolation and bandwidth preservation. The use of port-based VLANs effec-
tively partitions a single switch into multiple sub-switches, one for each VLAN.
will be flooded only to those ports that are part of the same VLAN. This provides the de-
sired traffic isolation and bandwidth preservation. The use of port-based VLANs effec-
tively partitions a single switch into multiple sub-switches, one for each VLAN.
VLAN 2
VLAN 1
VL
AN
AN
3
1
2
3
4
5
6
7
8
9
10
11
12
Fig. 8.1
Port-based VLAN
The IEEE 802.1q based ports on the switches support simultaneous tagged and
untagged traffic. An 802.1q port is assigned a default port VLAN ID (PVID), and all
untagged traffic is assumed to belong to the port default PVID. Thus, the ports participat-
ing in the VLANs accept packets bearing VLAN tags and transmit them to the port VLAN
ID.
untagged traffic. An 802.1q port is assigned a default port VLAN ID (PVID), and all
untagged traffic is assumed to belong to the port default PVID. Thus, the ports participat-
ing in the VLANs accept packets bearing VLAN tags and transmit them to the port VLAN
ID.
The below functions are explained.
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