Dell EMC Configuration Guide for the S3100 Series 9.14.2.4

Example of the show ip dhcp snooping Command

DellEMC#show ip dhcp snooping

IP DHCP Snooping                                 : Enabled.
IP DHCP Snooping Mac Verification                : Disabled.
IP DHCP Relay Information-option                 : Disabled.
IP DHCP Relay Trust Downstream                   : Disabled.

Database write-delay (In minutes)                : 0

DHCP packets information
Relay Information-option packets                 : 0
Relay Trust downstream packets                   : 0
Snooping packets                                 : 0

Packets received on snooping disabled L3 Ports   : 0
Snooping packets processed on L2 vlans           : 142

DHCP Binding File Details
Invalid File                                     : 0
Invalid Binding Entry                            : 0
Binding Entry lease expired                      : 0
List of Trust Ports                              :Gi 1/4
List of DHCP Snooping Enabled Vlans              :Vl 10
List of DAI Trust ports                          :Gi 1/4 

View the DHCP snooping binding table using the show ip dhcp snooping binding command.

DellEMC#show ip dhcp snooping binding
Codes :  S - Static D - Dynamic
IP Address        MAC Address        Expires(Sec)  Type  VLAN   Interface
=========================================================================
10.1.1.254       00:00:a0:00:00:02    162           D    Vl 200  Gi 1/4
10.1.1.225       00:00:a0:00:00:03    163           D    Vl 100  Gi 1/4

The following example output of the show ip dhcp snooping binding command displays that different IP addresses are mapped to the same MAC address:

DellEMC#show ip dhcp snooping binding
Codes :  S - Static D - Dynamic
IP Address        MAC Address        Expires(Sec)  Type  VLAN   Interface
=========================================================================
10.1.1.100       00:00:a0:00:00:00    39735         S    Vl 200  Gi 1/4
10.1.1.101       00:00:a0:00:00:00    39736         S    Vl 200  Gi 1/4
10.1.1.254       00:00:a0:00:00:00    162           D    Vl 200  Gi 1/4

The following example shows a sample output of the show ip dhcp snooping binding command for a device connected to both the VLT peers. The Po 10 interface is the VLT port channel connected to a ToR switch or an end device.

DellEMC#show ip dhcp  snooping binding
Codes :  S - Static D - Dynamic
IP Address        MAC Address        Expires(Sec)  Type  VLAN   Interface
=========================================================================
10.1.1.10        00:00:a0:00:00:00    39735         S    Vl 200  Po 10
10.1.1.11        00:00:a0:00:00:00    39736         S    Vl 200  Po 10
10.1.1.25        00:00:a0:00:00:00    162           D    Vl 200  Po 10

The following example shows a sample output of the show ip dhcp snooping binding command for a device connected to one of the VLT peers only (orphaned). The physical interface is the one that is directly connected to the VLT peer.

DellEMC#show ip dhcp snooping binding
Codes :  S - Static D - Dynamic
IP Address        MAC Address        Expires(Sec)  Type  VLAN   Interface
=========================================================================
10.1.1.100       00:00:a0:00:00:00    39735         S    Vl 200  Gi 1/4
10.1.1.101       00:00:a0:00:00:00    39736         S    Vl 200  Gi 1/4
10.1.1.254       00:00:a0:00:00:00    162           D    Vl 200  Gi 1/4

The following example shows a sample output of the show ip dhcp snooping binding command for a device connected to the peer VLT node, but not to itself. The Po 10 interface is the VLTi link between the VLT peers.

DellEMC#show ip dhcp  snooping binding
Codes :  S - Static D - Dynamic
IP Address        MAC Address        Expires(Sec)  Type  VLAN   Interface
=========================================================================
10.1.1.10        00:00:a0:00:00:00    39735         S    Vl 200  Po 10
10.1.1.11        00:00:a0:00:00:00    39736         S    Vl 200  Po 10
10.1.1.25        00:00:a0:00:00:00    162           D    Vl 200  Po 10