Maxim Petrov
SNR:
port-group 1
!
Interface Ethernet1/0/23
description ### uplink Prospekt188-CR-1
switchport mode trunk
port-group 1 mode passive
!
Interface Ethernet1/0/24
description ### uplink Prospekt188-CR-1
switchport mode trunk
port-group 1 mode passive
!
Interface Port-Channel1
Cisco:
interface Port-channel1
switchport trunk allowed vlan 15,526
switchport mode trunk
!
interface TenGigabitEthernet1/0/6
description /// to SNR-S2995-24FX
switchport trunk allowed vlan 15,526
switchport mode trunk
channel-group 1 mode active
!
interface TenGigabitEthernet1/0/7
description /// to SNR-S2995-24FX
switchport trunk allowed vlan 15,526
switchport mode trunk
channel-group 1 mode active
Конечно не логично... но попробуйте поменять на snr-е на mode active, у меня с обеих сторон активный режим стоит