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Ошибка на коммутаторе: %UDLD-4-UDLD_PORT_DISABLED: UDLD disabled interface, unidirectional link detected

Добрый день!

Есть два коммутатора уровня ядра (WS-C3850-24XS) в стеке и десяток аксессовых коммутаторов (WS-C3650-48PD), соединенные оптикой с etherchannel.
На ядре постоянно падает один из интерфейсов (Te1/0/7) в port-channel'е из-за udld. Подумал на физику, поменял оптический патч-корд - безрезультатно.
Поменял версию IOS на аксессовом коммутаторе с 03.06.03E на 03.07.02E, затем на 03.07.04E - тот же результат.
Что интересно, если попытаться изменить скорость на Port-channel'е ядра, то выходит ошибка:
Command rejected! TenGigabitEthernet1/0/7 in port-channel does not support speed change

Кто сталкивался с подобной проблемой?

#### КОММУТАТОР УРОВНЯ ЯДРА ####

Jan 13 14:40:28: %PM-4-ERR_RECOVER: Attempting to recover from udld err-disable state on Te1/0/7
Jan 13 14:40:31: %LINK-3-UPDOWN: Interface TenGigabitEthernet1/0/7, changed state to up
Jan 13 14:40:35: %UDLD-4-UDLD_PORT_DISABLED: UDLD disabled interface Te1/0/7, unidirectional link detected
Jan 13 14:40:35: %PM-4-ERR_DISABLE: udld error detected on Te1/0/7, putting Te1/0/7 in err-disable state
Jan 13 14:40:37: %LINK-3-UPDOWN: Interface TenGigabitEthernet1/0/7, changed state to down

CORE-3850#sh version
Cisco IOS Software, IOS-XE Software, Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version 03.07.02E RELEASE SOFTWARE (fc1)
...
ROM: IOS-XE ROMMON
BOOTLDR: CAT3K_CAA Boot Loader (CAT3K_CAA-HBOOT-M) Version 1.20, RELEASE SOFTWARE (P)
CORE-3850 uptime is 33 weeks, 21 hours, 20 minutes
Uptime for this control processor is 33 weeks, 21 hours, 23 minutes
System returned to ROM by Power Failure
System restarted at 17:23:24 MSK Thu May 26 2016
System image file is "flash:packages.conf"
Last reload reason: Power Failure
...
License Level: Ipservices
License Type: Permanent
Next reload license Level: Ipservices
...
cisco WS-C3850-24XS (MIPS) processor with 4194304K bytes of physical memory.
Processor board ID FCW1943D0HV
27 Virtual Ethernet interfaces
64 Ten Gigabit Ethernet interfaces
4 Forty Gigabit Ethernet interfaces
2048K bytes of non-volatile configuration memory.
4194304K bytes of physical memory.
253984K bytes of Crash Files at crashinfo:.
255037K bytes of Crash Files at crashinfo-2:.
3431232K bytes of Flash at flash:.
3417161K bytes of Flash at flash-2:.
0K bytes of Dummy USB Flash at usbflash0:.
0K bytes of Dummy USB Flash at usbflash0-2:.
0K bytes of  at webui:.
...
Switch Ports Model              SW Version        SW Image              Mode
------ ----- -----              ----------        ----------            ----
*    1 34    WS-C3850-24XS      03.07.02E         cat3k_caa-universalk9 INSTALL
     2 34    WS-C3850-24XS      03.07.02E         cat3k_caa-universalk9 INSTALL


CORE-3850#sh run inter Te1/0/7
!
interface TenGigabitEthernet1/0/7
 description Link 1 to ASW-3650-04
 switchport trunk native vlan 900
 switchport trunk allowed vlan 7,10,16,32,50,901
 switchport mode trunk
 switchport nonegotiate
 channel-group 4 mode active
end

CORE-3850#sh run inter Te2/0/7
!
interface TenGigabitEthernet2/0/7
 description Link 2 to ASW-3650-04
 switchport trunk native vlan 900
 switchport trunk allowed vlan 7,10,16,32,50,901
 switchport mode trunk
 switchport nonegotiate
 channel-group 4 mode active
end

CORE-3850#sh run inter Po4
!
interface Port-channel4
 description Etherchannel Link to ASW-3650-04
 switchport trunk native vlan 900
 switchport trunk allowed vlan 7,10,16,32,50,901
 switchport mode trunk
 switchport nonegotiate
 duplex full
end


CORE-3850#sh errdisable rec
...
Timer interval: 300 seconds
Interfaces that will be enabled at the next timeout:
Interface       Errdisable reason       Time left(sec)
---------       -----------------       --------------
Te1/0/7                     udld           56


CORE-3850#sh inter Te1/0/7
TenGigabitEthernet1/0/7 is down, line protocol is down (err-disabled)
  Hardware is Ten Gigabit Ethernet, address is 188b.4540.cd87 (bia 188b.4540.cd87)
  Description: Link 1 to ASW-3650-04
  MTU 1500 bytes, BW 10000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Full-duplex, 10Gb/s, link type is auto, media type is SFP-10GBase-SR
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:02:53, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/2000/0/0 (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
     561805 packets input, 64414058 bytes, 0 no buffer
     Received 561805 broadcasts (561805 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 561805 multicast, 0 pause input
     0 input packets with dribble condition detected
     936543 packets output, 118367190 bytes, 0 underruns
     0 output errors, 0 collisions, 19 interface resets
     0 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


#### АКСЕССОВЫЙ КОММУТАТОР ####

Jan 13 14:40:31: %LINK-3-UPDOWN: Interface TenGigabitEthernet1/1/3, changed state to up
Jan 13 14:40:37: %LINK-3-UPDOWN: Interface TenGigabitEthernet1/1/3, changed state to down

ASW-3650-04#sh run inter po1
!
interface Port-channel1
 description Etherchannel Link to CORE-3850
 switchport trunk native vlan 900
 switchport trunk allowed vlan 7,10,16,32,50,901
 switchport mode trunk
 switchport nonegotiate
 ip dhcp snooping trust
end
!
interface TenGigabitEthernet1/1/3
 description Link 1 to CORE-3850
 switchport trunk native vlan 900
 switchport trunk allowed vlan 7,10,16,32,50,901
 switchport mode trunk
 switchport nonegotiate
 channel-group 1 mode active
end
!
interface TenGigabitEthernet1/1/4
 description Link 2 to CORE-3850
 switchport trunk native vlan 900
 switchport trunk allowed vlan 7,10,16,32,50,901
 switchport mode trunk
 switchport nonegotiate
 channel-group 1 mode active
end

ASW-3650-04#sh ver
Cisco IOS Software, IOS-XE Software, Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version 03.07.04E RELEASE SOFTWARE (fc1)
...
ROM: IOS-XE ROMMON
BOOTLDR: CAT3K_CAA Boot Loader (CAT3K_CAA-HBOOT-M) Version 1.18, RELEASE SOFTWARE (P)
ASW-3650-04 uptime is 1 day, 6 hours, 25 minutes
Uptime for this control processor is 1 day, 6 hours, 29 minutes
System returned to ROM by Power Failure
System restarted at 09:21:16 MSK Thu Jan 12 2017
System image file is "flash:packages.conf"
Last reload reason: Power Failure
...
License Level: Lanbase
License Type: Permanent
Next reload license Level: Lanbase
cisco WS-C3650-48PD (MIPS) processor with 4194304K bytes of physical memory.
Processor board ID FDO1936Z046
2 Virtual Ethernet interfaces
50 Gigabit Ethernet interfaces
2 Ten Gigabit Ethernet interfaces
2048K bytes of non-volatile configuration memory.
4194304K bytes of physical memory.
250456K bytes of Crash Files at crashinfo:.
1609272K bytes of Flash at flash:.
0K bytes of Dummy USB Flash at usbflash0:.
0K bytes of  at webui:.

Switch Ports Model              SW Version        SW Image              Mode
------ ----- -----              ----------        ----------            ----
*    1 52    WS-C3650-48PD      03.07.04E         cat3k_caa-universalk9 INSTALL
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2 ОТВЕТ.

А почему вы грешите на софт,

А почему вы грешите на софт, но никак не проверяете трансивер даже? Может UDLD вполне корректно отрабатывает в вашем случае?

скорость интерфейса не

скорость интерфейса не меняется потому что фиксированная 10 гиг.

замена патч корда не достаточна.  протирать от загрязнения нужно трансиверы с двух сторон а возможен и выход из строя трансивера

в иосе нужно смотреть с двух сторон

sh int te1/1/7 trans

он покажет уровень сигнала

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