Output drops seem high on 801.11a radio interface

Unanswered Question

On at least 2 of our access points, it looks as though the total output drops are high for some APs that have very little client traffic on them. Our network monitoring system (OpManager via SNMP) has been generating alarms for high discard and error rates (> 90%).

Is this normal behavior? As you can see below I've had 540 drops in less than 3 minutes on my dot11radio 1 interface. The B/G radio seems OK.

MMIC-AP-RM#show interfaces dot11Radio 1

Dot11Radio1 is up, line protocol is up

Hardware is 802.11A Radio, address is 0016.9cbd.cfc0 (bia 0016.9cbd.cfc0)

MTU 1500 bytes, BW 54000 Kbit, DLY 1000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation 802.1Q Virtual LAN, Vlan ID 1., loopback not set

ARP type: ARPA, ARP Timeout 04:00:00

Last input 02:57:09, output 02:56:54, output hang never

Last clearing of "show interface" counters 00:02:24

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 540

Queueing strategy: fifo

Output queue: 0/30 (size/max)

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

112 packets input, 5652 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

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

0 input packets with dribble condition detected

0 packets output, 0 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier

0 output buffer failures, 0 output buffers swapped out

MMIC-AP-RM#show interfaces dot11Radio 0

Dot11Radio0 is up, line protocol is up

Hardware is 802.11G Radio, address is 0016.9cb9.cfe0 (bia 0016.9cb9.cfe0)

MTU 1500 bytes, BW 54000 Kbit, DLY 1000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:00:00, output 00:00:00, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/60/0 (size/max/drops/flushes); Total output drops: 3

Queueing strategy: fifo

Output queue: 0/30 (size/max)

5 minute input rate 2000 bits/sec, 4 packets/sec

5 minute output rate 25000 bits/sec, 2 packets/sec

637213 packets input, 119291746 bytes, 0 no buffer

Received 314 broadcasts, 0 runts, 0 giants, 0 throttles

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

0 input packets with dribble condition detected

671900 packets output, 334312758 bytes, 0 underruns

225 output errors, 0 collisions, 4 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier

0 output buffer failures, 0 output buffers swapped out

I have this problem too.
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