DHCP

[Shadius]

Hi all,

Networking newbie here.

I'd like to know how I can check if a router or switch is running DHCP. What command(s) can I use to display this information? 

Thanks in advance. 

[balaji.bandi · Accepted solution]

you can do below command : ( EDIT)

I will check if the configuration in the running configuration before i check other things

show run | in dhcp

if you see DHCP config in the running config :

i follow below syntax to check further :

To display the IP address bindings and their associated leases, use the following command:
#show ip dhcp binding

The following command displays any IP address conflicts that the router has detected in the DHCP address pool:

#show ip dhcp conflict

You can view the status of remote database backups with this command:

#show ip dhcp database

And you can see the global DHCP server statistics like this:

#show ip dhcp server statistics

[Shadius]

I ran the #show ip dhcp conflict command and I was presented with an IP address.

How would I go about solving the IP conflict?

This is for a switch stack of three WS-C3850-48P.

Also, is there a command I can use to reboot the switch stack?

[balaji.bandi]

You no need to reboot the stack, you can clear the ip conflict using EEM script :

You can do 2 ways, based on SYSLOG message you can clear the clear ip dhcp conflict

or you can do regular basis as below :

event manager applet clear-dhcp-conflict

event timer cron cron-entry "0 0 * * *"     <- adjust the cron entry based on the time and interval

action 1.0 cli command "enable"

action 2.0 cli command "clear ip dhcp conflict *"

action 3.0 syslog msg "Cleared IP DHCP conflict records"

[Seb Rupik]

Hi there,

On a router you would use show ip dhcp stats, on a modern switch running IOS-XE you would use show ip dhcp pool .

cheers,

Seb.

[Martin L]

I would use show ip dhcp bindings and show ip dhcp pool

Regards, ML
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