>> Схема:
>> https://c.radikal.ru/c43/1809/5a/7a650f71a673.png
> По хорошему надо прописать на всех коммутаторах
> vtp domain <ваше название>
> какой то выбрать мастером
> vtp mode server
> на остальных
> vtp mode client

Сделал вчера еще, не помогает.(

Воспроизвел на аналогичной железке:

Sep 26 04:31:20.871: %PM-4-ERR_DISABLE: loopback error detected on Gi0/10, putting Gi0/10 in err-disable state
Sep 26 04:31:20.888: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to down
.Sep 26 04:31:21.873: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/10, changed state to down
.Sep 26 04:31:22.875: %LINK-3-UPDOWN: Interface GigabitEthernet0/10, changed state to down
Cisco-Third-Center# sh int gi0/10 sum
Cisco-Third-Center# sh int gi0/10 summary

*: interface is up
IHQ: pkts in input hold queue     IQD: pkts dropped from input queue
OHQ: pkts in output hold queue    OQD: pkts dropped from output queue
RXBS: rx rate (bits/sec)          RXPS: rx rate (pkts/sec)
TXBS: tx rate (bits/sec)          TXPS: tx rate (pkts/sec)
TRTL: throttle count

  Interface                   IHQ       IQD       OHQ       OQD      RXBS      RXPS      TXBS      TXPS      TRTL
-----------------------------------------------------------------------------------------------------------------
  GigabitEthernet0/10           0         0         0         0         0         0         0         0         0
Cisco-Third-Center# sh int gi0/10
GigabitEthernet0/10 is down, line protocol is down (err-disabled)
  Hardware is Gigabit Ethernet, address is 848a.8d0c.370a (bia 848a.8d0c.370a)
  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Auto-duplex, Auto-speed, media type is 10/100/1000BaseTX
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:10:10, output 00:10:10, 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
     289286 packets input, 43020071 bytes, 0 no buffer
     Received 255649 broadcasts (54247 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 54247 multicast, 0 pause input
     0 input packets with dribble condition detected
     10480 packets output, 11916031 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     104 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out