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Troubleshooting Cisco 2800 Series Routers
OL-5789-01
Reading Port and Module LEDs
Reading Port and Module LEDs
The port and module LEDs, located on the front panel of the router on the Cisco 2801 router and on the
rear panel of the router on the Cisco 2811, Cisco 2821, and Cisco 2851 routers, enable you to determine
router performance and operation. For an explanation of these LEDs see Table 2.
SYS ACT Off No packet transfers are
occurring.
Ethernet not active or not connected. Check Ethernet
connections and make corrections as necessary.
Router not configured properly. Check configuration and
make corrections as necessary.
Blinking System is actively transferring
packets or is monitoring
internal activities.
Normal indication. No action required.
CF Off The flash memory is not being
accessed.
Normal indication. No action required. It is okay to remove
the CompactFlash memory card if the CF LED remains off.
Solid green or
blinking
The flash memory is being
accessed.
Normal indication. No action required.
Caution: Do not remove the CompactFlash memory card
while it is being accessed.
Table 1 System LEDs on Cisco 2800 Series Routers (continued)
LED
Indicator State Meaning Possible Causes and Corrective Actions
Table 2 LED Indicators on Cisco 2800 Series Routers
LED Indicator State Meaning Corrective Action
A = ACT Off Ethernet interface next to the
LED is not receiving packets.
Ethernet not active or not connected. Check
Ethernet connections and make corrections as
necessary.
Router not configured properly. Check
configuration and make corrections as necessary.
Solid or blinking
green
Ethernet interface next to the
LED is receiving packets.
Normal indication. No action required.
F = FDX Off Ethernet port next to the LED
is operating in half-duplex
mode.
Indication is for information only.
Solid green Ethernet port next to the LED
is operating in full-duplex
mode.
Indication is for information only.