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New Member

wireless slowed down, AP LAN interface txload 255/255


Just built up a new office network, have 5 2602i controlled by a 5508 on FlexConnect local switching mode. One day ago when I tested my wirless, I can got full speed, about 40M, but today, after some 40-50 staff moved in, no configuration is changed, but I can only get 4-5M on speed test when connecting on wirless,  but at the same time when connected on cable number, still got full speed, so not an internet link issue.

I checked around, only odd thing I noticed, is that all my 5 APs LAN port, int g0, showed txload 255/255, alrought very low bps and pps on the port. 

GigabitEthernet0 is up, line protocol is up
  Hardware is PowerPC Ethernet, address is 5087.89e2.bf52 (bia 5087.89e2.bf52)
  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 255/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full Duplex, 1Gbps, media type is T
  output flow-control is unsupported, input flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output never, output hang never
  Last clearing of "show interface" counters 00:00:18
  Input queue: 0/22852/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 2000 bits/sec, 2 packets/sec
  5 minute output rate 1000 bits/sec, 1 packets/sec
     60 packets input, 6703 bytes, 0 no buffer
     Received 36 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     36 packets output, 7796 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 pause output
     0 output buffer failures, 0 output buffers swapped out

how could I got txload 255/255 whne there was only 1k bps output?

suspect this is the reason slowed down my wireless, but why, and how can I fix it?


thanks a lot.


New Member

But didn't have packet loss

But didn't have packet loss when ping from the 4500 core switch to APs' MGT IPs or ping to wireless clients IPs.


P.S. on the AP I tested on, there are less then 10 associated clients at any given time.

New Member

this maybe a bug, but found

this maybe a bug, but found my wireless speed is not linked to this bug, the speed dropped dymatically when the distance increased about few meters, or 5-6 more clients connected.

Hall of Fame Super Silver

You have a similar post on

You have a similar post on this.... I would reference the other one so that it doesn't confuse others.


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New Member

Thank you.the reason I

Thank you.

the reason I started another one because I found txload255/255 is not the problem, so don't want to misslead people by the title.

Cisco Employee

Hi, There is a known issue



There is a known issue with the ISR with txload 255/255 on the ISR.

the Bug ID is CSCtw90305

Please do provide me the show version of the switch/router.




New Member

the txload 255/255 is on a AP

the txload 255/255 is on a AP's G0 port, not on the connected 4500 switch port.

my 4510 is on ver 15.0(1r)SG5

cisco WS-C4510R+E (MPC8572) processor (revision 10) with 2097152K/20480K bytes of memory.
Processor board ID FXS1818Q19K
MPC8572 CPU at 1.5GHz, Supervisor 7

my AP os

Cisco IOS Software, C2600 Software (AP3G2-K9W8-M), Version 15.2(2)JB3, RELEASE SOFTWARE (fc1)

cisco AIR-CAP2602I-Z-K9    (PowerPC) processor (revision A0) with 180214K/81920K bytes of memory.
Processor board ID FGL1825W9Q8
PowerPC CPU at 800Mhz, revision number 0x2151
Last reset from power-on
LWAPP image version