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Summary of Features
Port Redundancy
1-8
The AT-8518, AT-8525, and AT-8550 switches have optional redundant Gigabit
Ethernet ports. Using the redundant port, you can dual-home the switch to one or two
switches. Figure 1-5 illustrates a switch dual-homed to two different switches.
10/100BASE-T ETHERNET SWITCH
WITH GIGABIT ETHERNET
1000BASE-X
10/100BASE-TX MDI-X
ACTIVITY
1
2
3
4
5
6
7
8
9
10
11
12
LINK ON
DISABLED
1
2
3
4
5
6
7
8
9
10
11
12
POWER
A
25
25R
13
14
15
16
17
18
L
25
25R
19
20
21
22
23
24
25
25R
13
14
15
16
17
18
19
20
21
22
23
24
MGMT.
Figure 1-5 AT-8525 Dual-Homing Configuration
In the event that the active port fails or loses link status, the redundant port is
automatically activated. When the primary port resumes operation, the redundant port
becomes inactive. This feature can be disabled.
The redundant port cannot be used for load sharing when the primary port is active. If
the primary port becomes inactive, the redundant port is activated in the load sharing
configuration.
10/100BASE-T ETHERNET SWITCH
WITH GIGABIT ETHERNET
1000BASE-X
10/100BASE-TX MDI-X
ACTIVITY
1
2
3
4
5
6
7
8
9
10
11
12
LINK ON
DISABLED
1
2
3
4
5
6
7
8
9
10
11
12
POWER
A
25
25R
13
14
15
16
17
18
L
25
25R
19
20
21
22
23
24
25
25R
MGMT.
13
14
15
16
17
18
19
20
21
22
23
24
1000BASE-X
25
25R
10/100BASE-T ETHERNET SWITCH
WITH GIGABIT ETHERNET
1000BASE-X
10/100BASE-TX MDI-X
ACTIVITY
LINK ON
1
2
3
4
5
6
7
8
9
10
11
12
DISABLED
1
2
3
4
5
6
7
8
9
10
11
12
POWER
A
25
25R
13
14
15
16
17
18
L
25
25R
19
20
21
22
23
24
25
25R
13
14
15
16
17
18
19
20
21
22
23
24
MGMT.
10/100BASE-T ETHERNET SWITCH
WITH GIGABIT ETHERNET
10/100BASE-TX MDI-X
ACTIVITY
1
2
3
4
5
6
7
8
9
10
11
12
LINK ON
DISABLED
1
2
3
4
5
6
7
8
9
10
11
12
POWER
A
25
25R
13
14
15
16
17
18
L
25
25R
19
20
21
22
23
24
13
14
15
16
17
18
19
20
21
22
23
24
MGMT.
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