LLDP
Palo Alto Networks firewalls® support Link
Layer Discovery Protocol (LLDP), which functions at the link layer
to discover neighboring devices and their capabilities. LLDP allows
the firewall and other network devices to send and receive LLDP
data units (LLDPDUs) to and from neighbors. The receiving device
stores the information in a MIB, which the Simple Network Management
Protocol (SNMP) can access. LLDP makes troubleshooting easier, especially
for virtual wire deployments where the firewall would typically go
undetected by a ping or traceroute.