Switch 3870 — Front View Detail 13
LEDs Table 4 lists LEDs visible on the front of the Switch, and how to read their status according to color. For information on using the LEDs for problem solving, see “Checking for Correct Operation of LEDs” on page 23.
Table 4 | LED behavior |
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LED | Color | Indicates |
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Port Status/Packet LEDs |
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| Green | A high speed (1000 Mbps) link is present, and the port |
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| is enabled. |
| Green flashing | A high speed (1000 Mbps) link is present and active. |
| Yellow | A low speed (10/100 Mbps) link is present, and the |
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| port is enabled. |
| Yellow flashing | A low speed (10/100 Mbps) link is present and active. |
| Green for one | POST in operation, all LEDs perform a one second lamp |
| second, Amber | test. |
| for one second, |
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| then OFF until |
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| operational. |
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| Alternate yellow | A port has failed a loop back test during POST. |
| then green |
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| flashing (fast) |
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| Alternate yellow | A link is present but the port has been disabled. |
| then green |
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| flashing |
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| Off | No link is present. |
Stacking Status LED |
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| Green | The uplink/downlink is operating normally. |
| Yellow | |
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| connected but the other side is not). |
| Off | No stacking link is present. |
Stack Master LED |
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| Green | Master unit - normal stack operation status. |
| Yellow | Slave unit - normal stack operation status. |
| Yellow flashing | The system is in arbitration/election status. |
| Off | The system is not stacked. |
