Prerequisites for Using Link Layer Discovery Protocol in
Multivendor Networks
•
Type-Length-Value (TLV) types 0 through 127
•
To support LLDP-MED, the following organizationally specific TLVs must be implemented:
•
Extended Power-via-Media Dependent Interface (MDI)
•
Inventory
•
LLDP-MED Capabilities
•
MAC/PHY Configuration Status
•
Network Policy
•
Port VLAN ID
Restrictions for Using Link Layer Discovery Protocol in
Multivendor Networks
•
Use of LLDP is limited to 802.1 media types such as Ethernet, Token Ring, and Fiber Distributed Data
Interface (FDDI) networks.
•
The maximum number of neighbor entries per chassis is limited on MED-capable network connectivity
devices.
Information About Using Link Layer Discovery Protocol in
Multivendor Networks
IEEE 802.1ab LLDP
IEEE 802.1ab Link Layer Discovery Protocol (LLDP) is an optional link layer protocol for network topology
discovery in multivendor networks. Discovery information includes device identifiers, port identifiers, versions,
and other details. As a protocol that aids network management, LLDP provides accurate network mapping,
inventory data, and network troubleshooting information.
LLDP is unidirectional, operating only in an advertising mode. LLDP does not solicit information or monitor
state changes between LLDP nodes. LLDP periodically sends advertisements to a constrained multicast
address. Devices supporting LLDP can send information about themselves while they receive and record
information about their neighbors. Additionally, devices can choose to turn off the send or receive functions
independently. Advertisements are sent out and received on every active and enabled interface, allowing any
device in a network to learn about all devices to which it is connected. Applications that use this information
Carrier Ethernet Configuration Guide (Cisco ASR 920 Series)
328
Using Link Layer Discovery Protocol in Multivendor Networks
Prerequisites for Using Link Layer Discovery Protocol in Multivendor Networks
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