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New Member

Increasing Total Output Drops number

I have an autonomous Cisco AP1242 running on channel 11 (best channel avail) with only one client associated.

Signal Strength and Channel Utilization look good.

By design this client is constantly sending UDP/Multicast packets, so I had to disable IGMP Snooping on the AP. However, I have noticed data dropout and have been able to correlate it by running the command:

show interface dot11radio 0

Every-time I run the above command the Total Output Drops increases:

Dot11Radio0 is up, line protocol is up

  Hardware is 802.11G Radio, address is 001c.b0eb.eb70 (bia 001c.b0eb.eb70)

  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 00:37:46

  Input queue: 0/1127/0/0 (size/max/drops/flushes); Total output drops: 3178

  Queueing strategy: fifo

  Output queue: 0/30 (size/max)

  5 minute input rate 43000 bits/sec, 14 packets/sec

  5 minute output rate 92000 bits/sec, 17 packets/sec

     29799 packets input, 12551639 bytes, 0 no buffer

     Received 17376 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

     41308 packets output, 25121942 bytes, 0 underruns

     0 output errors, 0 collisions, 0 interface resets

     0 unknown protocol drops

     0 babbles, 0 late collision, 0 deferred

     0 lost carrier, 0 no carrier

     0 output buffer failures, 0 output buffers swapped out

I cleared the statistics and ran the command after a few minutes.

Any ideas what could be causing packets to be dropped?

QOS is disabled on the AP.

Thanks

2 REPLIES
VIP Purple

Re: Increasing Total Output Drops number

By design this client is constantly sending UDP/Multicast packets,

What type of volume you are talking about here, what is the data rate (bps & pps) of these multicast traffic flow takes ?. Keep in mind these radio may not have enough buffers to keep these (if you are sending high volume) & output packet drop is expected.

HTH

Rasika

**** Pls rate all useful responses ****

New Member

Re: Increasing Total Output Drops number

Hi,

There is only one wireless client.

Just took a 5 min Wireshark reading and it giving the following:

Packets: 2286

Avg. packets/sec: 7.729

Avg packet size: 671.527 bytes

Avg bytes/sec: 5190.457

I am new to this. Is the above considered high volume for one client?

I just compared a wired vs wireless captures... I am only losing packets on the wireless medium.

When you say that the radio may not have enough buffer... are you reffering to wireless adapater or the Acess Point?

Thanks

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