About Link Layer Discovery Protocol (LLDP) tagging

Link Layer Discovery Protocol (LLDP) information is sent by devices at a fixed interval in the form of an Ethernet frame. Each frame contains one LLDP Data Unit (LLDPDU). Each LLDPDU is a sequence of type-length-value (TLV) structures.

Untagged LLDP frames

By default, Virtual Connect interconnects use untagged LLDP frames to advertise their identity and learn about their link partners. LLDP advertises the Virtual Connect interconnect’s management IP addresses to uplink, downlink, and stacking link ports. LLDP frames also identify stacking links in a logical interconnect.

The IPv4 address (and IPv6 address if enabled) are used as the LLDP management address TLV.

Tagged LLDP frames

LLDP can also be used to communicate with a virtual switch in the hypervisor through the use of tagged LLDP frames on downlink ports. The tagged frame contains the VLAN ID that identifies the support of the configured FlexNIC. This information is used to build the network topology.

LLDP tagging can be enabled or disabled through the HPE OneView UI or REST API.