Arista trunk to Cisco 3850 not working

[chabot-isaac]

Hi,

I have an Arista DCS-7050TX-64 and Cisco Switch 3850 24X UPOE and a simple trunk configuration does not work.

Port light is steady green and recognizes when port is shutdown so not Layer 1 problem, but more than that, there's nothing happening.

When in routed port, does not work also, so if I'm correct that means Layer 2 is problematic.

LLDP doesnt show anything .

Here is the current configuration:
C3850:

interface TenGigabitEthernet1/0/24
switchport trunk native vlan 11

switchport trunk allowed vlan 11
switchport mode trunk

interface Vlan11
ip address 10.100.11.250 255.255.255.0

Arista switch:

interface Ethernet14
switchport trunk native vlan 11

switchport trunk allowed vlan 11
switchport mode trunk

interface Vlan11
ip address 10.100.11.253/24

=====================================================

Is there something I am missing or is it something more specific that needs to be added to the configuration?

Thanks

[marce1000]

  - Check logs on both devices when a connection is attempted when configuring 
    Perhaps these resources can provide insights , yet different configurations are used :
        https://www.youtube.com/watch?v=bvyLNM36pH8
        https://www.cs.colostate.edu/~fortega/fiu_html/fall16/cnt5415/labmaterial/notes/class20.html

  M.

[chabot-isaac]

For some reasons, even at default settings, making the connection from Ethernet14 -> Te1/0/20 seems to be working instead of 24.
Tried on another 3650 and worked fine, but on port 23-24 of my 3850 all trunks I tried to configure doesn't work...

Don't know whats the issue...