Cisco Catalyst 250 Series Configuration Guide

To support non-Cisco devices and to allow for interoperability between other devices, the switch supports the
IEEE 802.1AB Link Layer Discovery Protocol (LLDP). LLDP is a neighbor discovery protocol that is used
for network devices to advertise information about themselves to other devices on the network. This protocol
runs over the data-link layer, which allows two systems running different network layer protocols to learn
about each other.
LLDP Supported TLVs
LLDP supports a set of attributes that it uses to discover neighbor devices. These attributes contain type,
length, and value descriptions and are referred to as TLVs. LLDP supported devices can use TLVs to receive
and send information to their neighbors. This protocol can advertise details such as configuration information,
device capabilities, and device identity.
The switch supports these basic management TLVs. These are mandatory LLDP TLVs.
•
Port description TLV
•
System name TLV
•
System description TLV
•
System capabilities TLV
•
Management address TLV
These organizationally specific LLDP TLVs are also advertised to support LLDP-MED.
•
Port VLAN ID TLV (IEEE 802.1 organizationally specific TLVs)
•
MAC/PHY configuration/status TLV (IEEE 802.3 organizationally specific TLVs)
LLDP and Cisco Switch Stacks
A switch stack appears as a single switch in the network. Therefore, LLDP discovers the switch stack, not
the individual stack members.
LLDP and Cisco Medianet
When you configure LLDP or CDP location information on a per-port basis, remote devices can send Cisco
Medianet location information to the switch. For information, go to http://www.cisco.com/en/US/docs/ios/
netmgmt/configuration/guide/nm_cdp_discover.html.
LLDP-MED
LLDP for Media Endpoint Devices (LLDP-MED) is an extension to LLDP that operates between endpoint
devices such as IP phones and network devices such as switches. It specifically provides support for voice
over IP (VoIP) applications and provides additional TLVs for capabilities discovery, network policy, Power
over Ethernet, inventory management and location information. By default, all LLDP-MED TLVs are enabled.
Catalyst 2960-XR Switch Interface and Hardware Component Configuration Guide, Cisco IOS Release 15.0(2)EX1
54 OL-29420-01
Configuring LLDP, LLDP-MED, and Wired Location Service
LLDP-MED

Cisco Catalyst 250 Series Specifications

General

Brand	Cisco
Model	Catalyst 250 Series
Category	Switch
Language	English