The devices support the third and fourth Q-in-Q tags as payload (also known as pass-through tag) along with the existing two tags (for VLAN matching and operations). The devices support multiple Q-in-Q tags for both layer 2 bridging and EVPN-VXLAN cases. The Layer 2 access interfaces accept packets with three or four tags (all tags with the TPID value 0x8100). All the tags beyond the fourth tag (that is, from the fifth tag onward) are considered part of the Layer 3 payload and are forwarded transparently.
