Cisco ASR 900 Series Configuration Manual - Page 3
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Type-Length-Value Fields
Type-Length-Value (TLV) fields are blocks of information embedded in Cisco Discovery Protocol advertisements. Information in
advertisements varies, and the TLV frame format allows for extending advertisements when needed. The table below summarizes
the TLV definitions.
Table 1: Type-Length-Value Definitions for Cisco Discovery Protocol Version 2
TLV
Address TLV
Application TLV
Capabilities TLV
Device-ID TLV
Full or Half Duplex TLV
IP Network Prefix TLV
Location TLV
Location-Server TLV
Definition
Contains network addresses of both receiving and sending devices.
Provides a mechanism to send an application-specific TLV through Cisco
Discovery Protocol.
Identifies the device type, which indicates the functional capability of the device.
For example, a switch.
Identifies the device name in the form of a character string.
Indicates the duplex configuration of the Cisco Discovery Protocol broadcast
interface. This information is used by network operators to diagnose connectivity
problems between adjacent network devices.
Contains a list of network prefixes to which a sending device can forward IP
packets. A prefix includes the interface protocol and the port number. For
example, Ethernet 1/0.
Delivers location-based information to endpoint devices through access devices
(switches or routers) by using Cisco Discovery Protocol. The location TLV can
send the following types of information:
• Civic location information—Provides the civic address information and
the postal information. Examples include street address, road name, and
postal community name.
• ELIN location information—Provides the location information of a caller.
The location is determined by the emergency location identifier number
(ELIN), which is a phone number that routes an emergency call to the
local public safety answering point (PSAP) and which the PSAP can use
to call back the emergency caller.
You must configure the location TLV on the device before Cisco Discovery
Protocol can deliver location-based information to endpoint devices. For more
information about configuring location TLV, see the Using Link Layer Discovery
Protocol in Multivendor Networks module.
Provides a mechanism for location servers to transfer the required information
to neighboring devices.
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