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If "ignores" are present on all interfaces, then the router is probably overloaded with traffic, or doesn't have

sufficient free buffers in the pool that match the maximum transmission unit (MTU) on interfaces. In the latter

case, an increment of the ignored counter is followed by an increment of the no buffer counter:

router#show interfaces serial 0/0

...

1567 packets input, 0 bytes, 22 no buffer

22 input errors, 0 CRC, 0 frame, 0 overrun, 22 ignored, 0 abort

You may also see an increase in the buffer failures counter in the pool that matches the MTU size:

router#show buffers

...

Big buffers, 1524 bytes (total 50, permanent 50):

50 in free list (5 min, 150 max allowed)

3066 hits, 189 misses, 0 trims, 24 created

12 failures (0 no memory)

The number of preconfigured permanent, free, and maximum allowed buffers may not be completely

compatible for every environment. You can read more about this and how to avoid it in Buffer Tuning.

If "ignores" are only increasing on one interface and are not followed by an increment of the no buffer

counter, and the interface is not heavily loaded, then this interface could be faulty. In that case, capture the

output of the show tech−support command and contact the TAC. The load on the interface can be viewed in

the output of the show interfaces command:

router#show interfaces serial 0/0

...

reliability 255/255, txload 100/255, rxload 122/255

Input and Output Queue Drops

Input queue drops are never caused by hardware problems. Output queue drops may be caused by a hardware

problem only if the output queue is constantly full and no packets are being sent out of the interface. You can

read more about these kinds of drops in Troubleshooting Input Queue Drops and Output Queue Drops.

Router Loses Configuration due to Faulty or Corrupt

NVRAM

The router fails to load a previously saved configuration. One of the following error messages may be

observed:

System Bootstrap, Version 11.1(8)CA1, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)

Warning: monitor nvram area is corrupt ... using default values

Warning: NVRAM size is 0

environment checksum in NVRAM failed

Router#show startup−config

%Error opening nvram:/startup−config (Invalid Checksum)

Router#

These error messages usually indicate a hardware failure. To verify, issue the test memory command. The

Cisco − Hardware Troubleshooting for the Cisco 2600 Series Router

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