On Feb 22, 2018, at 10:40 AM, Bartłomiej Solarz-Niesłuchowski 
<bartlomiej.solarz-niesluchow...@wit.edu.pl> wrote:
> I have strange problem with ospf6d + VLAN interface + fedora 27.
> 
> in ospf6d config file(on disk) i have:
> interface enp1s0f0.224
>  ipv6 ospf6 cost 1
>  ipv6 ospf6 network broadcast
> 
> BUT after rebooting serwer when i log in to management console:
> sh run
> interface enp1s0f0.224
>  ipv6 ospf6 ifmtu 1504
>  ipv6 ospf6 cost 1
>  ipv6 ospf6 network broadcast
> 
> interface has MTU 1500 bytes:
> sh interface enp1s0f0.224
> Interface enp1s0f0.224 is up, line protocol is up
>   Link ups:       1  last: Thu, 22 Feb 2018 16:34:20 +0100
>   Link downs:     0  last: (never)
>   vrf: 0
>   index 4 metric 0 mtu 1500
>   flags: <UP,BROADCAST,RUNNING,MULTICAST>
>   Type: Unknown
>   HWaddr: 00:1e:67:37:67:bc
>   inet 213.135.44.139/28 broadcast 213.135.44.143
>   inet6 fe80::21e:67ff:fe37:67bc/64
>   inet6 2001:1a68:a:3000::139/64
> 
> WHY config automatically changing????

Maybe because .1q VLAN tags use four bytes?

/a
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