C недавних пор появилась большая загрузка CPU Подскажите куда копать

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K5CpuMan Review       30.00  78.85     30     24  100  500  103 109   85  4392:59
......
PacketBufRaw              184.29     100%          184.29      100%
PacketBufRaw             4644.56     100%         4644.56      100%

sh platform cpu packet statistics
Queue                  Total           5 sec avg 1 min avg 5 min avg 1 hour avg
---------------------- --------------- --------- --------- --------- ----------
Input ACL fwd(snooping)      1715792881      7675      7414      5959       5773
L2 bridge to CPU, 0           78097843       350       328       266        252
Host Learning                  1116526        10         1         1          2
L2 Control                     4792725        21        12         8          0
InputIf Fail                    241027         0         0         0          0
L2 router to CPU, 7             107870         0         0         0          0
L3 Fwd, 7                         5324         0         0         0          0
L3 Receive, 7                   380877        10         0         0          0

Packets Dropped by Packet Queue

Queue                  Total           5 sec avg 1 min avg 5 min avg 1 hour avg
---------------------- --------------- --------- --------- --------- ----------
Input ACL fwd(snooping)          551065         0         0         0          0
L2 bridge to CPU, 0               5667         0         0         0          0
Host Learning                     1738         0         0         0          0
InputIf Fail                     49263         0         0         0          0
L2 router to CPU, 7               8457         0         0         0          0
L3 Fwd, 7                        17310         0         0         0          0

show version
Cisco IOS Software, Catalyst 4500 L3 Switch Software (cat4500e-IPBASE-M), Version 12.2(53)SG5, RELEASE SOFTWARE (fc1)

ROM: 12.2(44r)SG10
Darkside Revision 0, Jawa Revision 11, Tatooine Revision 140, Forerunner Revision 1.78

4900 uptime is 3 days, 10 hours, 43 minutes
System returned to ROM by reload
System restarted at 04:18:06 Irkutsk Sat Nov 3 2012
System image file is "bootflash:cat4500e-ipbase-mz.122-53.SG5.bin"

cisco WS-C4900M (MPC8548) processor (revision 2) with 1048576K bytes of memory.
Processor board ID JAE154406HY
MPC8548 CPU at 1.33GHz, Cisco Catalyst 4900M
Last reset from Reload
4 Virtual Ethernet interfaces
8 Ten Gigabit Ethernet interfaces
511K bytes of non-volatile configuration memory.