VxLAN packets are encapsulated with an outer VLAN tag with VID 1 on Trident3

[KanjiMonster]

Expected Behavior

There is no outer VLAN tag on VxLAN packets unless explicitly configured.

Actual Behavior

On Trident3, there is an outer VLAN tag on VxLAN packets.

Steps to Reproduce the Problem

Create a VxLAN tunnel, try to send packets over it. When looking at them form the other side, there will be a VLAN tag added to them, while non-VxLAN packets are correctly untagged:

08:07:48.026027 f8:8e:a1:e0:bb:14 > 90:e2:ba:61:16:50, ethertype 802.1Q (0x8100), length 114: vlan 1, p 0, ethertype IPv4, (tos 0x0, ttl 45, id 50, offset 0, flags [none], proto UDP (17), length 96)
    192.168.0.2.54443 > 192.168.0.1.4789: VXLAN, flags [I] (0x08), vni 50000
f8:8e:a1:e0:83:49 > 90:e2:ba:61:13:a0, ethertype ARP (0x0806), length 60: Ethernet (len 6), IPv4 (len 4), Request who-has 10.0.0.1 tell 10.0.0.2, length 46
08:07:49.060756 f8:8e:a1:e0:bb:14 > 90:e2:ba:61:16:50, ethertype 802.1Q (0x8100), length 114: vlan 1, p 0, ethertype IPv4, (tos 0x0, ttl 45, id 51, offset 0, flags [none], proto UDP (17), length 96)
    192.168.0.2.54443 > 192.168.0.1.4789: VXLAN, flags [I] (0x08), vni 50000
f8:8e:a1:e0:83:49 > 90:e2:ba:61:13:a0, ethertype ARP (0x0806), length 60: Ethernet (len 6), IPv4 (len 4), Request who-has 10.0.0.1 tell 10.0.0.2, length 46
08:07:50.094093 f8:8e:a1:e0:bb:14 > 90:e2:ba:61:16:50, ethertype 802.1Q (0x8100), length 114: vlan 1, p 0, ethertype IPv4, (tos 0x0, ttl 45, id 52, offset 0, flags [none], proto UDP (17), length 96)
    192.168.0.2.54443 > 192.168.0.1.4789: VXLAN, flags [I] (0x08), vni 50000
f8:8e:a1:e0:83:49 > 90:e2:ba:61:13:a0, ethertype ARP (0x0806), length 60: Ethernet (len 6), IPv4 (len 4), Request who-has 10.0.0.1 tell 10.0.0.2, length 46
...
08:08:20.585970 90:e2:ba:61:16:50 > f8:8e:a1:e0:bb:14, ethertype ARP (0x0806), length 42: Ethernet (len 6), IPv4 (len 4), Request who-has 192.168.0.2 tell 192.168.0.1, length 28
08:08:20.586112 f8:8e:a1:e0:bb:14 > 90:e2:ba:61:16:50, ethertype ARP (0x0806), length 60: Ethernet (len 6), IPv4 (len 4), Reply 192.168.0.2 is-at f8:8e:a1:e0:bb:14, length 46

Specifications

• Version: 5.0.0
• Platform: cel-questone-2a, as5835-54x tested, as7726-32x and as4630-54pe likely affected as well
• Subsystem: ofdpa