Dell EMC SmartFabric OS10 User Guide Release 10.5.0

Address binding is a mapping between the IP address and the media access control (MAC) address of a client. The DHCP server assigns the client an available IP address automatically and then creates an entry in the binding table. You can also manually create an entry for a client. Manual bindings help to guarantee that a particular network device receives a particular IP address.

Consider manual bindings as single-host address pools. There is no limit to the number of manual bindings, but you can only configure one manual binding per host. Manual binding entries do not display in the show ip dhcp binding output.

1. Create an address pool in DHCP mode.

   pool name

2. Enter the client IP address in DHCP <POOL> mode.

   host address

3. Enter the client hardware address in DHCP <POOL> mode.

   hardware-address hardware-address

Configure manual binding

OS10(config)# ip dhcp server
OS10(conf-dhcp)# pool static
OS10(conf-dhcp-static)# host 20.1.1.2
OS10(conf-dhcp-static)# hardware-address 00:01:e8:8c:4d:0a

View the DHCP binding table

OS10# show ip dhcp binding
  IP Address        Hardware address     Lease expiration        Hostname
+--------------------------------------------------------------------------
11.1.1.254        00:00:12:12:12:12 Jan 27 2016 06:23:45

Total Number of Entries in the Table = 1

With a fixed host configuration, also known as manual binding, you must configure a network pool with a matching subnet. The static host-to-MAC address mapping pool inherits the network mask from the network pool with subnet configuration, which includes the host’s address range.

In the following example, the pool host1, which is the fixed host mapping pool, inherits the subnet and other attributes from the pool hostnetwork, which is the DHCP client IP address pool. There is no matching network pool for host2. Therefore, the DHCP client with the MAC address 00:0c:29:aa:22:f4 does not obtain the correct parameters.

OS10# show running-configuration interface ethernet 1/1/2 
! 
interface ethernet1/1/2 
no shutdown 
no switchport 
ip address 100.1.1.1/24 
flowcontrol receive off 

OS10# show running-configuration ip dhcp
!
ip dhcp server
no disable
!
pool host1
host 100.1.1.34
hardware-address 00:0c:29:ee:4c:f4
!
pool hostnetwork
lease infinite
network 100.1.1.0/24
!
pool host2
host 20.1.1.34
hardware-address 00:0c:29:aa:22:f4