Port redundancy – Allied Telesis AT-8550 User Manual
Page 16
Summary of Features
1-8
Port Redundancy
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.
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.
POWER
MGMT.
10/100BASE-T ETHERNET SWITCH
WITH GIGABIT ETHERNET
1
2
3
4
13
14
15
16
5
6
7
8
17
18
19
20
9
10
11
12
21
22
23
24
LINK ON
ACTIVITY
DISABLED
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
25
25R
25R
A
L
25
25R
1000BASE-X
10/100BASE-TX MDI-X
POWER
MGMT.
10/100BASE-T ETHERNET SWITCH
WITH GIGABIT ETHERNET
1
2
3
4
13
14
15
16
5
6
7
8
17
18
19
20
9
10
11
12
21
22
23
24
LINK ON
ACTIVITY
DISABLED
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
25
25R
25R
A
L
25
25R
1000BASE-X
10/100BASE-TX MDI-X
POWER
MGMT.
10/100BASE-T ETHERNET SWITCH
WITH GIGABIT ETHERNET
1
2
3
4
13
14
15
16
5
6
7
8
17
18
19
20
9
10
11
12
21
22
23
24
LINK ON
ACTIVITY
DISABLED
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
25
25R
25R
A
L
25
25R
1000BASE-X
10/100BASE-TX MDI-X
POWER
MGMT.
10/100BASE-T ETHERNET SWITCH
WITH GIGABIT ETHERNET
1
2
3
4
13
14
15
16
5
6
7
8
17
18
19
20
9
10
11
12
21
22
23
24
LINK ON
ACTIVITY
DISABLED
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
25
25R
25R
A
L
25
25R
1000BASE-X
10/100BASE-TX MDI-X