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Note: Using Auto Uplink to create multiple active paths between any two network
devices can cause undesirable loops in the network, resulting in an endless broadcast
traffic that disables your network. Loops occur when there are alternate routes
between two network devices. In Figure 2-3, for example, a loop is created by con-
necting two RJ-45 ports on a GS516T Switch to a router containing a 4-port
switch. Figure 2-4 shows another scenario where a router with a 4-port switch con-
nects to a hub and to a GS516T Switch; the hub and switch, in turn, connect back
to the same router, creating multiple active paths between all three devices.
Gree=FDX Yellow=COL
16
Blinking=Adfity on=10MLink
PORT
1
2
3
4
5
6
7
8
1
Gree=FDX Yellow=COL
Blinking=Adfity on=10MLink
9
10
11
12
13
14
15
16
9
FR314 Router
Figure 2-3. Warning! Creating loops disables your network(Example 1)
EN524 Hub
®
Figure 2-4. Warning! Creating loops disables your network(Example 2)
Model GS516T
GS516T
8
16
Model GS516T
®
10/100Mbps
Fast Ethernet Switch
MODEL
EN524
with
Ports
9
PORTS
1
2
3
4
5
6
7
100M
10M
On = Link
1000M
100M
Activity
Power
1
2
3
4
5
6
7
8
9
Green = FDX, Yellow = COL
FR314 Router
Switching
MODEL
FS509T
8
9
On = Link
1000M
100M
Figure 2-5
physical description
2-3
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