Arista EOS: %ETH-4-ERRDISABLE: no-internal-vlan error detected

If you are seeing the following error message 

Jan 12 19:03:19 sn452 Ebra: %ETH-4-ERRDISABLE: no-internal-vlan error detected on Ethernet81.

And the output of "show interface status" indicates some ethernet ports are error-disabled like

sn452.19:00:35(config-if-Et1-104)#show interfaces status errdisabled
   Port        Name             Status         Reason
----------- ---------------- ----------------- ----------------
   Et81                         errdisabled    no-internal-vlan
   Et82                         errdisabled    no-internal-vlan

The reason for the above error is that EOS running out of internal VLAN for routed ports. The EOS needs to assign an internal VLAN for the none switching ports. If you have the following 2 lines of configuration, you may hit this error

switchport default mode routed <<< all ports are routed
vlan internal order descending range 4001 4080 <<< but only 80 VLANs assigned

So the solution is to remove the internal VLAN range.