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Making VLAN Connections
These switches support VLANs which can be used to organize any group of network
nodes into separate broadcast domains. VLANs confine broadcast traffic to the
originating group, and can eliminate broadcast storms in large networks. This
provides a more secure and cleaner network environment.
VLANs can be based on untagged port groups or traffic can be explicitly tagged to
identify the VLAN group to which it belongs. Untagged VLANs can be used for small
networks attached to a single switch. However, tagged VLANs should be used for
larger networks, and all the VLANs assigned to the inter-switch links.
The Gigabit Ethernet Switches also support multiple spanning trees which allow
VLAN groups to maintain a more stable path between all VLAN members. This can
reduce the overall amount of protocol traffic crossing the network, and provide a
shorter reconfiguration time when any link in the spanning tree fails.
At Layer 3, VLANs are used to create an IP interface, where one or more ports are
assigned to the same IP segment. Traffic is automatically routed between different
IP segments on the same switch, without any need to configure routing protocols.
R&D
VLAN 1
Tagged
Por ts
VLAN 2
Testin g
Note: When connecting to a switch that does not support IEEE 802.1Q VLAN tags, use
untagged ports.
Unt aggedPor ts
VLAN
unawar e
Finance
switc h
Marketin g
VLAN 3
VLAN 4
Figure 2-4 Making VLAN Connections
Application Examples
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TaggedPor t
M4-AIR
M4-FAST 8SFP
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MEDIA SLOTS
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SLOT.PORT
M4-8TP
LS
LED
P
P1
P2
P3
P4
RM
RL1
RL2
FAN
RUN
MACH 4002 48+4G
L/D
FDX 1000
AN TP/FO
RING
LED
PORT STBY
TEST
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1
SELECT
M4-AIR
M4-FAST 8SFP
M4-GIGA 8SFP
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M4-8TP
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M4-FAST 8TP PoE
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LED
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P1
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R
RM
RL1
RL2
FAN
RUN
MACH 4002 48+4G
LED
LS/DA 6.1
6.16 LS/DA
L/D
FDX 1000
AN TP/FO
V.24
USB
PORT STBY
RING
TEST
LED
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1
RL1
SELECT
RL2
LS
DA
LS
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Finance
VLAN 3
2
St ackMaster
St ackID
St ack Lin k
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Master
Power
Select
RPU
Diag
Module
Console
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VLAN
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M4-GIGA 8SFP
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awar e
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M4-FAST 8TP PoE
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P
R
LS/DA 6.1
6.16 LS/DA
LED
switc h
V.24
USB
RL1
RL2
LS
DA
LS
DA
LS
DA
LS
DA
6.1
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6.11
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6.15
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6.14
6.16
R&D
Testin g
VLAN 1
VLAN 2
2-5
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