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Hello guys,

for some reason these logs start to appear

Aug 18 14:10:36.779: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on GigabitEthernet5 (not half duplex), with CE67 GigabitEthernet0/1 (half duplex)

CSR1000V Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Version 15.5(3)S

interface GigabitEthernet5
ip address x
ip pim sparse-mode
negotiation auto
ospfv3 3 ipv6 area 0
cdp enable

IOSv Software (VIOS-ADVENTERPRISEK9-M), Version 15.6(2)T

interface GigabitEthernet0/1
ip address Y
ip pim sparse-mode
duplex auto
speed auto
media-type rj45
ipv6 ospf 2 area 0
end

Any ideas?

actually such command like

duplex full

exist under interface as well

Uldis

Long explanation:
it's a vOIS bug due to duplex auto negotiation failure, you can do nothing but configure a full duplex every time the device reload.

If I am not wrong, the same issue was with l2 IOL, so, needed to add duplex settings after each reboot

from interface config mode

int rang x/x-x
no negotiation auto
duplex full

cop r s

export cfg

I cant believe we came this far but something simple as duplex mismatch cant be fixed for once and for all.