Fixed Switch Configuration Guide 13-1
13
Configuring Neighbor Discovery
This chapter describes how to configure the Link Layer Discovery Protocol (LLDP), the Enterasys
Discovery Protocol, and the Cisco Discovery Protocol on Enterasys fixed stackable and standalone
switches.
Neighbor Discovery Overview
Neighbor discovery is the Layer 2 process in which a device identifies and advertises itself to its
directly connected neighbors. Enterasys devices support the following neighbor discovery
protocols:
• Link Layer Discovery Protocol (LLDP) and its extension, LLDP-MED, which is the IEEE
802.1AB standard for neighbor discovery
• Enterasys Discovery Protocol, for discovering Enterasys devices
• Cisco Discovery Protocol, for discovering Cisco devices
Neighbor discovery is useful for:
• Determining an accurate physical network topology
• Creating an inventory of network devices
• Troubleshooting the network
LLDP, Enterasys Discovery Protocol, and Cisco Discovery Protocol are enabled on Enterasys
devices by default. Though all three discovery protocols can run simultaneously, LLDP is the
preferred protocol.
If a device, attached to a port that has been enabled for neighbor discovery, does not support
LLDP but supports Enterasys Discovery Protocol or Cisco Discovery Protocol, then one of those
protocols is used instead.
Neighbor Discovery Operation
The neighbor discovery protocols support the Layer 2 process of network devices advertising their
identities and capabilities on a LAN and discovering that information about their directly
For information about... Refer to page...
Neighbor Discovery Overview 13-1
Configuring LLDP 13-7
Configuring Enterasys Discovery Protocol 13-10
Configuring Cisco Discovery Protocol 13-11
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