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.

PPTP. network behind client.

Две площадки объединены туннелем. На одной стоит PPTP сервер на линуксе, на другой микротик, который цепляется к первому клиентским туннелем. За микротиком сетка 192.168.3.0/24. В линуксе нужно прописать маршрут. Делаем это динамически при подключении определенного пира. IP-адрес для пира постоянный. Итак, в файл /etc/ppp/ip-up дописываем:

#!/bin/sh
#
# This script is run by the pppd after the link is established.
# It uses run-parts to run scripts in /etc/ppp/ip-up.d, so to add routes,
# set IP address, run the mailq etc. you should create script(s) there.
#
# Be aware that other packages may include /etc/ppp/ip-up.d scripts (named
# after that package), so choose local script names with that in mind.
#
# This script is called with the following arguments:
#    Arg  Name                          Example
#    $1   Interface name                ppp0
#    $2   The tty                       ttyS1
#    $3   The link speed                38400
#    $4   Local IP number               12.34.56.78
#    $5   Peer  IP number               12.34.56.99
#    $6   Optional ``ipparam'' value    foo

# The  environment is cleared before executing this script
# so the path must be reset
PATH=/usr/local/sbin:/usr/sbin:/sbin:/usr/local/bin:/usr/bin:/bin
export PATH

# These variables are for the use of the scripts run by run-parts
PPP_IFACE="$1"
PPP_TTY="$2"
PPP_SPEED="$3"
PPP_LOCAL="$4"
PPP_REMOTE="$5"
PPP_IPPARAM="$6"
export PPP_IFACE PPP_TTY PPP_SPEED PPP_LOCAL PPP_REMOTE PPP_IPPARAM

# as an additional convenience, $PPP_TTYNAME is set to the tty name,
# stripped of /dev/ (if present) for easier matching.
PPP_TTYNAME=`/usr/bin/basename "$2"`
export PPP_TTYNAME

case "$5" in
        172.26.100.42)
                /sbin/route add 192.168.3.161/32 gw 172.26.100.42
                ;;
        *)
esac

# If /var/log/ppp-ipupdown.log exists use it for logging.
if [ -e /var/log/ppp-ipupdown.log ]; then
  exec > /var/log/ppp-ipupdown.log 2>&1
  echo $0 $*
  echo
fi

# This script can be used to override the .d files supplied by other packages.
if [ -x /etc/ppp/ip-up.local ]; then
  exec /etc/ppp/ip-up.local "$*"
fi

run-parts /etc/ppp/ip-up.d \
  --arg="$1" --arg="$2" --arg="$3" --arg="$4" --arg="$5" --arg="$6"

# if pon was called with the "quick" argument, stop pppd
if [ -e /var/run/ppp-quick ]; then
  rm /var/run/ppp-quick
  wait
  kill $PPPD_PID
fi

Тут есть описание переменных, можно сделать это в отдельном файле ip-up.local. Да, чтобы одинаковые маршруты не плодились не забудьте прописать аналогичное в ip-down (route del).