Technical data

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Identifying Fatal Boot Failures
Fatal boot failures can be identified by the LEDs light patterns displayed on the front panel of the router.
Note:
Normal LED states are described in the in the
Hardware Reference
section of the
Quick Start Guide
.
TEST, LNK, WAN, and LANT are used to display these fatal errors according to the following LED patterns:
0-0-0-G CPM fail
0-0-G-0 Timer fail
0-0-G-G Bad FCS
0-G-0-0 DRAM fail
0-G-0-G Interrupt fail
0-G-G-0 SCC fail
Y-0-0-0 CPU step fail
Y-0-0-G Ethernet loop fail
FG-0-0-* Wait stuck in the boot menu. Kernel file could be missing (* green LED blinking very rapidly)
G-0-0-* Green occasionally blinks off (at 10-second intervals). Issuing BootP requests
Where 0 = LED light is off
G = LED light is on, blinking green
FG = LED blinking fast
Y = LED blinking yellow
* = LED could be on, off, or blinking
Any other combinations of the 4LEDs flashing in a regular pattern will indicate an internal error. The router
should be returned to the factory for repair or replacement.
Note:
Non-fatal errors are not displayed by the LEDs, but prompt the system to print explanatory messages on the
console.
Software Kernel Upgrades
Booting and Upgrading from the LAN
You can download a new version of the router software kernel using a TFTP server existing on the LAN. The
following steps show you how to boot the router software from the network and copy the image from the network
into the router’s FLASH memory. When first connecting to the router, the GUI backs up all the files to a directory
called Sxxxxx where x is the router’s serial number.