Link fails between router and switch

Question

Cisco

Cisco 7606 and QTECH 3900, 10 Gb / s link does not rise. We shutdowndo it on both devices and right there no shutdown. Link rises for about 10 seconds and then falls again. Debug on Kutek: Minimal interface settings: Cisco: QTECH: Tell me , please, where to look?

Apr 6 00:05:00: %SRM-7-SRMDebug:
SRM_portLinkUpAndDown start.ulPort=32
Apr 6 00:05:00: %DEVICE-3-LINKUPDOWN: e0/2/1 LinkUp.
Apr 6 00:05:00: %LINK_AGGREGATION-7-info: LACP Link Up port:51 .
Apr 6 00:05:01: %DOT1X-7-Dot1xDebug: port enabled ......port=51.
...
QSW-3900(config-if-ethernet-0/2/1)#Apr 6 00:05:14: %SRM-7-SRMDebug:
SRM_portLinkUpAndDown start.ulPort=32
Apr 6 00:05:14: %DEVICE-3-LINKUPDOWN: e0/2/1 LinkDown.
Apr 6 00:05:14: %LINK_AGGREGATION-7-info: LACP Link down port:51 .
Apr 6 00:05:15: %DOT1X-7-Dot1xDebug: port disabled ......port=51.

interface TenGigabitEthernet4/4
description QTECH
no ip address
no cdp enable
end
и куча сабинтерфейсов

description Cisco
switchport default vlan 4000
no switchport trunk allowed vlan 1
switchport trunk allowed vlan много
no dlf-forward multicast
end

Answer 1

Everything is standard
here 1. Try to change the port on the switch.
2. Change the network cable.
3. Play around with manually selecting the speed and duplex, perhaps in a certain mode everything will be lost.
In general, a fairly common glitch of cats. Tau their interfaces are dying…

Answer 2

There is such a thing on optical modules called DDM. This functionality, among other things, allows you to find out the attenuation level, the temperature of the optical module. Including, if the signal is weak, the switch can be configured so that it lays the port (on long lines on a number of firmware this is the default, and it was there that the timeout was 10 seconds before shutting down)
Therefore, read about DDM, learn about functioning on your hardware, and disable if necessary. They themselves once suffered with lengths after updating the firmware.