Reading Port And Module Leds - Cisco 2851 - Integrated Services Router User Manual

Reading Port and Module LEDs

Table 1 System LEDs on Cisco 2800 Series Routers (continued)
LED
Indicator State
SYS ACT Off
Blinking
CF Off
Solid green or
blinking
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 LED Indicators on Cisco 2800 Series Routers
LED Indicator State
A = ACT Off
Solid or blinking
green
F = FDX Off
Solid green
Troubleshooting Cisco 2800 Series Routers
6
Meaning
No packet transfers are
occurring.
System is actively transferring
packets or is monitoring
internal activities.
The flash memory is not being
accessed.
The flash memory is being
accessed.
Meaning
Ethernet interface next to the
LED is not receiving packets.
Ethernet interface next to the
LED is receiving packets.
Ethernet port next to the LED
is operating in half-duplex
mode.
Ethernet port next to the LED
is operating in full-duplex
mode.
Possible Causes and Corrective Actions
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.
Normal indication. No action required.
Normal indication. No action required. It is okay to remove
the CompactFlash memory card if the CF LED remains off.
Normal indication. No action required.
Caution: Do not remove the CompactFlash memory card
while it is being accessed.
Corrective Action
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.
Normal indication. No action required.
Indication is for information only.
Indication is for information only.
Table 2.
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