VLAN Fields

The VLAN fields are used to identify 802.1q tag(s) of a packet, as well as ingress and egress VLAN associations of an observer in relation to a specific packet or connection.

Network.vlan fields are used to record a single VLAN tag, or the outer tag in the case of q-in-q encapsulations, for a packet or connection as observed, typically provided by a network sensor (e.g. Zeek, Wireshark) passively reporting on traffic.

Network.inner VLAN fields are used to report inner q-in-q 802.1q tags (multiple 802.1q encapsulations) as observed, typically provided by a network sensor (e.g. Zeek, Wireshark) passively reporting on traffic. Network.inner VLAN fields should only be used in addition to network.vlan fields to indicate q-in-q tagging.

Observer.ingress and observer.egress VLAN values are used to record observer specific information when observer events contain discrete ingress and egress VLAN information, typically provided by firewalls, routers, or load balancers.

The vlan fields are expected to be nested at: network.vlan, network.inner.vlan, observer.egress.vlan, observer.ingress.vlan.

Note also that the vlan fields are not expected to be used directly at the top level.