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Knowledge Base

Configuring the Cisco Discovery Protocol (CDP) with ESXi (1003885)

Last Updated: 5/8/2020Categories: How toTotal Views: 137996Language:
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Details

ESXi hosts have the ability to use the Cisco Discovery Protocol (CDP). The article describes configuring the host and provides an example configuration of a physical switch.

Solution

To configure CDP for a Standard vSwitch:

Log in as root to the Service Console (via SSH, remote console, or physical console if connecting to ESX) or to management vmkernel port (if connecting to ESXi).

Verify the current CDP setting for the desired virtual switch (vSwitch1, in this example):

# esxcfg-vswitch -b vSwitch1

You see an output similar to:

listen

The output of listenindicates CDP is configured to read CDP information from the physical switch if available.
This is the default setting for ESXi.

Set the CDP status for a given virtual switch. Possible values here are down, listen, advertise, or both.

Listen mode - The ESXi host detects and displays information about the associated Cisco switch port, but information about the vSwitch is not available to the Cisco switch administrator.

Advertise mode - The ESXi host makes information about the vSwitch available to the Cisco switch administrator, but does not detect and displays information about the Cisco switch.

Both mode - The ESXi host detects and displays information about the associated Cisco switch and makes information about the vSwitch available to the Cisco switch administrator.

# esxcfg-vswitch -B both vSwitch1

Verify the new setting:

# esxcfg-vswitch -b vSwitch1

You see an output similar to:

both

To configure CDP on a vNetwork Distributed Switches (vDS):

Connect to vCenter Server using the vSphere Client.

In the vCenter Server home page, click Networking.

Right-click the vDS and click Edit Settings.

Select Advanced under Properties.

Using the checkbox and the drop down, change the CDP settings.

The following is an example of configuring CDP for a Cisco 6500 physical switch:

switch#

switch# config terminal

switch(config)# cdp run

switch(config)# interface g1/1

switch(config-if)# cdp enable

switch# show cdp neighbors

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone
Device ID Local Intrfce Holdtme Capability Platform Port ID
pa-tse-h24.pasl.vmware.comGig 1/1 121 S VMware ESXvmnic2
pa-tse-h24.pasl.vmware.comGig 1/2 121 S VMware ESXvmnic3

Additional Information

For translated versions of this article, see:

日本語: ESX/ESXi でのシスコ検出プロトコル (CDP) の構成 (2073910)

简体中文: 在 ESX/ESXi 中配置 Cisco 发现协议 (CDP) (2086448)

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Additional Resources

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Verificação da integridade de arquivo da máquina virtual hospedada (1003846)

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End Of General Availability of the Free vSphere Hypervisor (ESXi 7.x and 8.x) (2107518)

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•
ホストされた仮想マシンに対して十分なディスクの空き領域があることの確認 (1003856)

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Related Products:

VMware vSphere ESXi

Related Versions:

VMware vSphere ESXi 7.0.0

VMware vSphere ESXi 6.7

VMware vSphere ESXi 6.5

VMware vSphere ESXi 6.0

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