VPP VLAN connectivity does not work, tested in 1.5.0 and latest rolling release.

Steps to reproduce:

vyos-r01

set interfaces ethernet eth0 vif 100 address '192.168.10.20/24'
set vpp settings interface eth0

vyos-r02:

set interfaces ethernet eth0 vif 100 address '192.168.10.10/24'
set vpp settings interface eth0

To allow VLAN traffic, required to apply this workaround:

sudo vppctl set interface promiscuous on eth0

vyos@vpp-r01:~$ sudo ethtool -i eth0
driver: tun
version: 1.6
firmware-version:
expansion-rom-version:
bus-info: tap
supports-statistics: no
supports-test: no
supports-eeprom-access: no
supports-register-dump: no
supports-priv-flags: no

vyos@vyos-r02:~$ ping 192.168.10.20
PING 192.168.10.20 (192.168.10.20) 56(84) bytes of data.
64 bytes from 192.168.10.20: icmp_seq=8 ttl=64 time=1.61 ms
64 bytes from 192.168.10.20: icmp_seq=9 ttl=64 time=1.14 ms
64 bytes from 192.168.10.20: icmp_seq=10 ttl=64 time=1.09 ms
^C

192.168.10.20 ping statistics ---
10 packets transmitted, 3 received, 70% packet loss, time 9175ms
rtt min/avg/max/mdev = 1.094/1.279/1.608/0.233 ms

Tested in the GNS3 lab.

Attached sceen record for reference.