Verifying Dynamic DHCP Options for a Router

You can identify dynamically obtained DHCP options for a router.
  1. On a router enter the show running-config command. Examine the output to identify dynamically obtained options. These options have a “dynamic” tag appended to them in the running configuration. 
    device> show running-config

Current configuration:
!
ver 08.0.61b1T213
...
!
!
vlan 1 name DEFAULT-VLAN by port
!
!
!
hostname TestHostName dynamic
ip dns domain-list ManualDomain.com
ip dns domain-list testDomain.com dynamic
ip dns domain-list testStaticDomain.com
ip dns server-address 20.20.20.8 20.20.20.9 10.10.10.5(dynamic) 20.20.20.5
ip route 0.0.0.0/0 10.10.10.1 distance 254 dynamic
!
!
interface ethernet 1/1/7
 ip address 10.10.10.2 255.255.255.0 dynamic
!
interface ethernet 1/1/21
 disable                                                          
!
interface ethernet 1/2/2
 speed-duplex 1000-full
!
interface ethernet 1/2/4
 speed-duplex 1000-full
!
interface ethernet 1/2/5
 speed-duplex 1000-full
!
interface ethernet 1/2/6
 speed-duplex 1000-full
!
interface ethernet 1/2/7
 speed-duplex 1000-full
!
interface ethernet 1/2/8
 speed-duplex 1000-full
!
!                                                                 
lldp run
!
!
end
  2. On a router enter the show configuration command. Examine the output to identify dynamically obtained options. These options have a “dynamic” tag appended to them in the running configuration. 
    device> show configuration

!
Startup-config data location is flash memory
!
Startup configuration:
!
ver 08.0.61b1T213
!
stack unit 1
 ...
!
!
vlan 1 name DEFAULT-VLAN by port
!
!
!
ip dns domain-list ManualDomain.com
ip dns domain-list testStaticDomain.com
ip dns server-address 20.20.20.8 20.20.20.9 20.20.20.5
ip route 0.0.0.0/0 10.10.10.1 distance 254 dynamic
!
!
!
interface ethernet 1/1/7
 ip address 10.10.10.2 255.255.255.0 dynamic
!
interface ethernet 1/1/21                                         
 disable
!
interface ethernet 1/2/2
 speed-duplex 1000-full
!
interface ethernet 1/2/4
 speed-duplex 1000-full
!
interface ethernet 1/2/5
 speed-duplex 1000-full
!
interface ethernet 1/2/6
 speed-duplex 1000-full
!
interface ethernet 1/2/7
 speed-duplex 1000-full
!
interface ethernet 1/2/8
 speed-duplex 1000-full
!                                                              
!
lldp run
!
!
end
Parent topic: DHCP Clients