White Paper

Previous discovery methods
LLDP Ethertype
Rather than using an Ethernet type of 0x8999, previous versions of the controller injected packets with an Ethernet type of
LLDP (0x88cc). By using this Ethernet type for direct link discovery packets, all direct links would be correctly discovered
because LLDP is defined as being below the 802.1Q vlan tagging layer. This approach is no longer considered an option
because LLDP is also used by end-hosts for other purposes, such as PoE. If the controller injects LLDP packets which reach
end hosts, those LLDP packets will cause issues with technologies that depend on LLDP for configuration data, such as VoIP
phones and wireless access points (among others). In testing, it was discovered that injection of LLDP packets from the
controller for discovery purposes caused IP phones and PoE devices to malfunction.
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5998-6990, October 2014