System Management Configuration Guide, Cisco DCNM for LAN, Release 5.x
Configuring LLDP
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Configuring LLDP

Table Of Contents

Configuring LLDP

Information About LLDP

LLDP Overview

High Availability

Licensing Requirements for LLDP

Prerequisites

Guidelines and Limitations for LLDP

Platform Support

Configuring LLDP

Enabling or Disabling LLDP Globally

Enabling or Disabling LLDP on an Interface

Additional References

Related Documents

Standards

Feature History for LLDP


Configuring LLDP


This chapter describes how to configure the Link Layer Discovery Protocol (LLDP) in order to discover servers that are connected to your Cisco NX-OS device.

This chapter includes the following sections:

Information About LLDP

Licensing Requirements for LLDP

Prerequisites

Guidelines and Limitations for LLDP

Platform Support

Configuring LLDP

Additional References

Feature History for LLDP

Information About LLDP

This section includes the following topics:

LLDP Overview

High Availability

LLDP Overview

The Cisco Discovery Protocol (CDP) is a device discovery protocol that runs over the data-link layer (Layer 2) on all Cisco-manufactured devices (routers, bridges, access servers, and switches). CDP allows network management applications to automatically discover and learn about other Cisco devices that are connected to the network.

To permit the discovery of non-Cisco devices, the switch also supports the Link Layer Discovery Protocol (LLDP), a vendor-neutral device discovery protocol that is defined in the IEEE 802.1ab standard. LLDP allows 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 is a one-way protocol that transmits information about the capabilities and current status of a device and its interfaces. LLDP devices use the protocol to solicit information only from other LLDP devices. Cisco DCNM can use LLDP to discover only servers that are connected to your device.


Note For information on device discovery and manually binding devices to a server, see the Cisco DCNM Fundamentals Guide, Release 5.x.


High Availability

The LLDP feature supports stateless and stateful restarts.After a reboot or supervisor switchover, the running configuration is applied.

Licensing Requirements for LLDP

The following table shows the licensing requirements for this feature:

Product
License Requirement

Cisco DCNM

LLDP requires no license. Any feature not included in a license package is bundled with Cisco DCNM and is provided at no extra charge to you. For a complete explanation of the Cisco DCNM licensing scheme, see the Cisco DCNM Installation and Licensing Guide, Release 5.x.

Cisco NX-OS

LLDP requires no license. Any feature not included in a license package is bundled with the Cisco NX-OS system images and is provided at no extra charge to you. For an explanation of the Cisco NX-OS licensing scheme for your platform, see the licensing guide for your platform.


Prerequisites

The LLDP feature has the following prerequisite (for a full list of feature-specific prerequisites, see the platform-specific documentation):

System-message logging levels for the LLDP feature must meet or exceed Cisco DCNM requirements. During device discovery, Cisco DCNM detects inadequate logging levels and raises them to the minimum requirements. Cisco Nexus 7000 Series switches that run Cisco NX-OS Release 4.0 are an exception. For Cisco NX-OS Release 4.0, prior to device discovery, use the command-line interface to configure logging levels to meet or exceed Cisco DCNM requirements. For more information, see the Cisco DCNM Fundamentals Guide, Release 5.x.

Guidelines and Limitations for LLDP

LLDP has the following configuration guidelines and limitations (for a full list of feature-specific guidelines and limitations, see the platform-specific documentation):

LLDP timers and type, length, and value (TLV) descriptions cannot be configured using Cisco DCNM.

Platform Support

The following platform supports this feature. For platform-specific information, including guidelines and limitations, system defaults, and configuration limits, see the corresponding documentation.

Platform
Documentation

Cisco Nexus 5000 Series switches

Cisco Nexus 5000 Series Switch Documentation

Cisco Nexus 7000 Series switches

Cisco Nexus 7000 Series Switch Documentation


Configuring LLDP

This section includes the following topics:

Enabling or Disabling LLDP Globally

Enabling or Disabling LLDP on an Interface

Enabling or Disabling LLDP Globally

You can enable or disable LLDP globally on Cisco Nexus 7000 Series switches.


Note LLDP is enabled globally on Cisco Nexus 5000 Series switches and cannot be disabled.


BEFORE YOU BEGIN

Make sure that you are in the correct VDC.

DETAILED STEPS


Step 1 From the Feature Selector pane, choose Interfaces > Physical > Ethernet. The available devices appear in the Summary pane.

Step 2 From the Summary pane, click the device on which you want to enable or disable LLDP.

Step 3 Do one of the following:

To enable LLDP on the device, from the menu bar, choose Actions > Enable LLDP Service.

To disable LLDP on the device, from the menu bar, choose Actions > Disable LLDP Service.

Step 4 From the menu bar, choose File > Deploy to apply your changes to the device.


Enabling or Disabling LLDP on an Interface

After you globally enable LLDP, it is enabled on all supported interfaces by default. However, you can enable or disable LLDP on individual interfaces or selectively configure an interface to only send or only receive LLDP packets.


Note If the interface is configured as a tunnel port, LLDP is disabled automatically.



Note Beginning with Cisco DCNM Release 5.1, you can enable or disable LLDP on individual interfaces on Cisco Nexus 5000 Series switches.


BEFORE YOU BEGIN

Make sure that you are in the correct VDC.

Make sure that you have globally enabled LLDP on the device. For more information, see the "Enabling or Disabling LLDP Globally" section.

DETAILED STEPS


Step 1 From the Feature Selector pane, choose Interfaces > Physical > Ethernet. The available devices appear in the Summary pane.

Step 2 From the Summary pane, expand the device, expand the slot, and click the port on which you want to enable or disable LLDP.

Tabs appear for the port information in the Details pane. The Port Details tab is active, but its sections are not expanded.

Step 3 Do one of the following:

To disable LLDP on the port, from the menu bar, choose Actions > Disable LLDP.

To enable LLDP on the port, from the menu bar, choose Actions > Enable LLDP.

Step 4 From the Details pane, expand the Basic Settings section.

When LLDP is enabled, the LLDP Transmit Enabled and LLDP Receive Enabled fields show "Enabled."

When LLDP is disabled, the LLDP Transmit Enabled and LLDP Receive Enabled fields show "Disabled."

Step 5 (Optional) To selectively configure the port to only send or only receive LLDP packets, do one of the following:

To configure the port to only send LLDP packets, choose Enabled from the LLDP Transmit Enabled drop-down list and choose Disabled from the LLDP Receive Enabled drop-down list.

To configure the port to only receive LLDP packets, choose Disabled from the LLDP Transmit Enabled drop-down list and choose Enabled from the LLDP Receive Enabled drop-down list.

Step 6 From the menu bar, choose File > Deploy to apply your changes to the device.


Additional References

For additional information related to implementing LLDP, see the following sections:

Related Documents

Standards

Related Documents

Related Topic
Document Title

Device discovery

Cisco DCNM Fundamentals Guide, Release 5.x

VDCs

Virtual Device Context Configuration Guide, Cisco DCNM for LAN, Release 5.x


Standards

Standards
Title

No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature.


Feature History for LLDP

Table 6-1 lists the release history for this feature.

Table 6-1 Feature History for LLDP

Feature Name
Releases
Feature Information

LLDP

5.2(1)

No change from Release 5.1.

LLDP

5.1(1)

You can enable or disable LLDP per interface on Cisco Nexus 5000 Series switches.

LLDP

5.0(2)

This feature was introduced.