Ошибка PLATFORM_UCAST-4-PREFIX Catalsyt 3750

show platform tcam utilization
sh platform ip unicast counts
sh platform ip unicast failed route 

Тут подробно - http://www.anticisco.ru/forum/viewtopic.php?f=2&t=4836&view=previous

Тут же мимо ходом. Нашел процесс, который съедает весь цпу. HL3U bkgrd process. По нему нашел вот что - https://supportforums.cisco.com/discussion/11788206/hl3u-bkgrd-proce-high-cpu-usage-3750x-switch:

Hl3u bkgrd process - manages quite a few background tasks like

- Hardware Arp throttling house keeping tasks

- Retry adjs/Fib in case of an out of hardware resource condition

- proxy arp house keeping functions

- ICMP redirect processing

- TTL ICMP error generation in some conditions

- handling correct route forwarding in an output acl full condition

2) Check for ARP statictics under sh ip traffic.I dont have any access to the config of your device hence assuming.

could you check if "no ip arp incomplete enable" command dose the trick for you?

3) Also consider the bug mentioned by Alex thats a clean hit.

ASA troubleshooting

Для диагностики конфигурации в АСА можно использовать следующие команды:
 - show conn [detail]
 - show xlate

EDGE-5512X/sec/act# show local-host ?

  Hostname or A.B.C.D     Show local host information corresponding to this ip
                          address
  Hostname or X:X:X:X::X  Show local host information corresponding to an IPV6
                          address
  all                     To show connections including to-the-box and
                          from-the-box
  brief                   Enter this keyword for brief information
  connection              Show local host information  based on the number of
                          connections
  detail                  Enter this keyword for detailed information
  |                       Output modifiers
Продолжение следует.

Немного диагностики

#show processes cpu
#show memory
#show interface

#show controllers
#show platform
#show inventory
#show diag