Microsoft Lldp Driver
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The Link Layer Discovery Protocol (LLDP) is a vendor-neutral link layer protocol used by network devices for advertising their identity, capabilities, and neighbors on a local area network based on IEEE 802 technology, principally wired Ethernet.[1] The protocol is formally referred to by the IEEE as Station and Media Access Control Connectivity Discovery specified in IEEE 802.1AB and IEEE 802.3 section 6 clause 79.[2]Windows xp torrent download.
LLDP performs functions similar to several proprietary protocols, such as Cisco Discovery Protocol, Foundry Discovery Protocol, Nortel Discovery Protocol and Link Layer Topology Discovery.
Information gathered[edit]
Information gathered with LLDP can be stored in the device management information database (MIB) and queried with the Simple Network Management Protocol (SNMP) as specified in RFC 2922. The topology of an LLDP-enabled network can be discovered by crawling the hosts and querying this database. Information that may be retrieved include:
- System name and description
- Port name and description
- VLAN name
- IP management address
- System capabilities (switching, routing, etc.)
- MAC/PHY information
Applications[edit]
The Link Layer Discovery Protocol may be used as a component in network management and network monitoring applications.
One such example is its use in data center bridging requirements. The Data Center Bridging Capabilities Exchange Protocol (DCBX) is a discovery and capability exchange protocol that is used for conveying capabilities and configuration of the above features between neighbors to ensure consistent configuration across the network.[3]
LLDP is used to advertise power over Ethernet capabilities and requirements and negotiate power delivery.
Frame structure[edit]
LLDP information is sent by devices from each of their interfaces at a fixed interval, in the form of an Ethernet frame. Each frame contains one LLDP Data Unit (LLDPDU). Each LLDPDU is a sequence of type-length-value (TLV) structures.
The Ethernet frame used in LLDP typically has its destination MAC address set to a special multicast address that 802.1D-compliant bridges do not forward. Other multicast and unicast destination addresses are permitted. The EtherType field is set to 0x88cc.
Each LLDP frame starts with the following mandatory TLVs: Chassis ID, Port ID, and Time-to-Live. The mandatory TLVs are followed by any number of optional TLVs. The frame ends with a special TLV, named end of LLDPDU in which both the type and length fields are 0.
Accordingly, an Ethernet frame containing an LLDPDU has the following structure:
| Preamble | Destination MAC | Source MAC | Ethertype | Chassis ID TLV | Port ID TLV | Time to live TLV | Optional TLVs | End of LLDPDU TLV | Frame check sequence |
|---|---|---|---|---|---|---|---|---|---|
| 01:80:c2:00:00:0e, or 01:80:c2:00:00:03, or 01:80:c2:00:00:00 | Station's address | 0x88CC | Type=1 | Type=2 | Type=3 | Zero or more complete TLVs | Type=0, Length=0 |
Each of the TLV components has the following basic structure:
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| Type | Length | Value |
|---|---|---|
| 7 bits | 9 bits | 0-511 octets |
| TLV type | TLV name | Usage in LLDPDU |
|---|---|---|
| 0 | End of LLDPDU | Mandatory |
| 1 | Chassis ID | Mandatory |
| 2 | Port ID | Mandatory |
| 3 | Time To Live | Mandatory |
| 4 | Port description | Optional |
| 5 | System name | Optional |
| 6 | System description | Optional |
| 7 | System capabilities | Optional |
| 8 | Management address | Optional |
| 9–126 | Reserved | - |
| 127 | Custom TLVs | Optional |
Custom TLVs[note 1] are supported via a TLV type 127. The value of a custom TLV starts with a 24-bit organizationally unique identifier and a 1 byte organizationally specific subtype followed by data. The basic format for an organizationally specific TLV is shown below:
| Type | Length | Organizationally unique identifier (OUI) | Organizationally defined subtype | Organizationally defined information string |
|---|---|---|---|---|
| 7 bits—127 | 9 bits | 24 bits | 8 bits | 0-507 octets |
According to IEEE Std 802.1AB, §9.6.1.3, 'The Organizationally Unique Identifier shall contain the organization's OUI as defined in IEEE Std 802-2001.' Each organization is responsible for managing their subtypes.
Media endpoint discovery extension [edit]
Media Endpoint Discovery is an enhancement of LLDP, known as LLDP-MED, that provides the following facilities:
- Auto-discovery of LAN policies (such as VLAN, Layer 2 Priority and Differentiated services (Diffserv) settings) enabling plug and play networking.
- Device location discovery to allow creation of location databases and, in the case of Voice over Internet Protocol (VoIP), Enhanced 911 services.
- Extended and automated power management of Power over Ethernet (PoE) end points.
- Inventory management, allowing network administrators to track their network devices, and determine their characteristics (manufacturer, software and hardware versions, serial or asset number).
The LLDP-MED protocol extension was formally approved and published as the standard ANSI/TIA-1057 by the Telecommunications Industry Association (TIA) in April 2006.[5]
See also[edit]
Notes[edit]
- ^Termed Organizationally Specific TLVs by IEEE 802.1AB
References[edit]
- ^'802.1AB-REV - Station and Media Access Control Connectivity Discovery'. IEEE. Retrieved 2009-10-17.
- ^'IEEE 802.1AB-2016 - IEEE Standard for Local and metropolitan area networks - Station and Media Access Control Connectivity Discovery'.
- ^Qlogic; et al. 'DCB Capabilities Exchange Protocol Base Specification, Rev 1.01'(PDF). IEEE 802.
- ^IEEE 802.1AB 8.4 Basic TLV Format
- ^'ANSI/TIA-1057 standard'(PDF).
External links[edit]
- Tutorial on the Link Layer Discovery Protocol on EE Times
- 802.1AB - Station and Media Access Control Connectivity Discovery on IEEE 802.1
- Link Layer Discovery Protocol on The Wireshark Wiki
Microsoft Lldp Protocol Driver Disable
Microsoft Lldp Driver Windows 7
The link layer discovery protocol (LLDP) is an open and extendable part of the Internet protocol suite used in IEEE 802 to advertise a device’s identity and abilities, as well as other devices connected within the same network.
LLDP is mainly used in wired Ethernet-connected devices to facilitate management of network resources and simplify networking tasks for administrators in a multi-vendor network. The protocol’s multi-vendor support enables network discovery of devices and management tools like Simple Network Management Protocol (SNMP) in a network made up of devices from different manufacturers. LLDP makes it unnecessary to use a larger number of proprietary protocols to support a multi-vendor network or, on the other hand, limit oneself to the hardware of a single vendor.
On an interval schedule, an LLDP device sends its information in Ethernet frames. A frame starts with the required TLVs of Chassis ID, Port ID, and time-to-live (TTL). The frame contains the device’s destination MAC address as a multicast address that is not forwarded outside a network, assuming 802.1D compliance.
LLDP is also known as Station and Media Access Control Connectivity Discovery, as specified in IEEE 802.1AB. Similar proprietary protocols include Cisco Discovery Protocol (CDP), Extreme Discovery Protocol, Foundry Discovery Protocol (FDP), Microsoft's Link Layer Topology Discovery and Nortel Discovery Protocol (AKA SONMP).