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New Member

ASA Dispatch unit high CPU


On ASA 5510 8.2.5(50)

We are contantly gettin high cpu usage for Dispatch unit process for last 10 hours. The Dispatch unit is taking approx 40% usage constantly.

We checked teh following:

1. The interfaces.

    No error counts, overruns, underruns reported.

2. show perform

    All connections below normal/avg. values conn and xlate

   Approx 1100 and 112

4. show traffic

    shows very less  drop counts ( max is 3 pkts/sec) on some interfaces not all.

    Traffic usage is very less . Approx 4Mbps from all interfaces cumulatively.

5. Checked inspections.

  No drops in global service policy [ only global is there]


# sh cpu usage 
CPU utilization for 5 seconds = 39%; 1 minute: 39%; 5 minutes: 39%

sh processes cpu-usage sorted 
PC         Thread       5Sec     1Min     5Min   Process
081aadc4   a79aff7c    35.7%    37.5%    42.5%   Dispatch Unit
0853f89e   a79a0b68     0.4%     0.2%     0.2%   ARP Thread

# sh conn count 
1138 in use, 8777 most used

# sh xlate count 
112 in use, 265 most used

# sh interface e0/0 | inc overrun
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
# sh interface e0/1 | inc overrun
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

# show perfmon detail 

PERFMON STATS:                     Current      Average
Xlates                                0/s          0/s
Connections                          23/s         32/s
TCP Conns                            20/s         28/s
UDP Conns                             0/s          1/s
URL Access                            0/s          0/s
URL Server Req                        0/s          0/s
TCP Fixup                             0/s          0/s
TCP Intercept Established Conns       0/s          0/s
TCP Intercept Attempts                0/s          0/s
TCP Embryonic Conns Timeout           0/s          1/s
HTTP Fixup                            0/s          0/s
FTP Fixup                             0/s          0/s
AAA Authen                            0/s          0/s
AAA Author                            0/s          0/s
AAA Account                           0/s          0/s

VALID CONNS RATE in TCP INTERCEPT:    Current      Average
                                       N/A         85.00%

Connections for 1 minute = 23/s; 5 minutes = 32/s
TCP Conns for 1 minute = 18/s; 5 minutes = 27/s
UDP Conns for 1 minute = 1/s; 5 minutes = 2/s

Gurjit Singh
Network Engineer
Spooster IT Services.


Hi, Do you see any logs for



Do you see any logs for the specific error getting flooded to syslog?

Do you see anything on the show asp drop output?

Do you see any tcp-intercept error?




New Member

Hi, Unfortunately clients



Unfortunately clients syslog server is not fully operational yet.

There are asp drops related to ACL and  and non tcp-intercept errors.

Hi, Do you see enormous



Do you see enormous number of blocks for acl? if so can you clear the asp drops and see if cpu utilization comes down?


clear asp drop and see




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