Сейчас перешел на винду, там к сожалению таже самая проблема.
Вот столкнулся сегодня:
свич 3745, с платой на 16ть портов.Fa1/10 notconnect 1 auto auto 10/100BaseTX
c3745#show interfaces fastEthernet 1/10
FastEthernet1/10 is up, line protocol is down
Hardware is Fast Ethernet, address is c402.0c68.f10a (bia c402.0c68.f10a)
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Auto-duplex, Auto-speed
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 input packets with dribble condition detected
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
c3745#
Но, если навести курсор на железку в интерфейсе, то в всплывающем меню показывает что порт подключен.