For port-based address assignment, you must perform the task in the Automatically Generating a Subscriber Identifier for a DHCP Message Received on a Port task to associate the client ID with the subscriber ID.DHCP server configuration can handle providing options to all devices asking for an IP address and also bound to a specific client identifier or mac address family. Any client entering the network can ask for specific DHCP options in addition to its IP address (eg vendor Preassigning IP Addresses and Associating Them to a Client: Preassigning IP Addresses and Associating Them to a ClientDHCP (Dynamic Host Configuration Protocol) is a protocol that automatically provides an Internet Protocol (IP) host with its IP address and other related configuration information such as subnet mask and default gateway. A DHCP server listens on the network for any DHCP client (host computer) to request address and services.Perform this task to preassign an IP address and associate it to aA DHCP client id is nothing but the MAC address of the host device. This option is disabled by default. When you enable 'Ignore DHCP Client ID' and a DHCP client sends a DHCPREQUEST for a lease, the DHCP server identifies the DHCP client using the physical MAC address of the appliance while the UID is ignored. The DHCP server then allocates an IP address based on the MAC address of the DHCP client.On a Cisco IOS DHCP server, it is pretty simple.Unique client ID—By default this consists of theHardware type (01 for Ethernet) and the MAC address (a.b.c.d). The subscriber ID value is based on the short name ofThe port to which the directly connected device is attached.Configure a normal DHCP pool by supplying any DHCP options and leaseTime. Preassigned addresses are automatically excluded from normalDynamic IP address assignment. Address ip-address client-id string Preassigned addresses cannot be used inHost pools, but there can be multiple preassigned addresses per DHCPOnly one IP address can be assigned per port.Preassigned addresses (also called reserved addresses) cannot beCleared by using the clear ip dhcp binding command. address ip-address hardware-address mac-address Based on your comments: ip dhcp pool Test-PoolAddress 192.168.17.137 hardware-address 0100.71cc.You set the options no-hostname if youDo not want the DHCP client to send the hostname with the packets.You set the DHCP lease time as 86,400 seconds. You use hexadecimal if the clientIdentifier is a MAC address. You then specify the DHCP client identifierAs 00:0a:12:00:12:12 in hexadecimal. Configure the DHCP client identifier prefix as the routingIn this example, you configure the device as a DHCP client.You specify the interface as ge-0/0/2, set the logical unit as 0,And create a DHCP inet family. You can then set the client-identifier,Options no-hostname, lease time, retransmission attempts, retry interval,Preferred DHCP local server address, and vendor class ID.To configure optional DHCP client attributes on SRX300,SRX320, SRX340, SRX550M, and SRX1500 devices: If a client does not requestA specific lease time, then the server sends the default lease time.The default lease time on a Junos OS DHCP server is 1 day.Number of times the client attempts to retransmit a DHCPIP address of the server that the client queries forTCP/IP settings learned from an external DHCP serverTo the DHCP server running on the switch are propagated.Vendor class ID (CPU's manufacturer ID string) for theFor the device to operate as a DHCP client, you configure aLogical interface on the device to obtain an IP address from the DHCPLocal server in the network.
![]() Dhcp Client Id Mac Address Family[edit interfaces ge-0/0/2 unit 0 family inet set client-identifier prefix hostSet the DHCP lease time. Edit interfaces ge-0/0/2 unit 0 family inet dhcp-clientConfigure the DHCP client identifier as a hexadecimalValue. For instructions on how toDo that, see Using the CLI Editor in Configuration Mode in the CLI User Guide.Specify the DHCP client interface. This is the vendor class identificationConfigure options no-hostname if you do not want the clientTo send hostname in the packets (RFC option code 12).If you are done configuring the device, click Commit >.The following example requires you to navigate variousLevels in the configuration hierarchy. Type 192.168.2.1.Set the vendor class ID. [edit interfaces ge-0/0/2 unit 0 family inet set server-address 192.168.2.1Set the vendor class ID for the DHCP client. [edit interfaces ge-0/0/2 unit 0 family inet set force-discover.Set the IPv4 address of the preferred DHCP server. [edit interfaces ge-0/0/2 unit 0 family inet set retransmission-interval 5Configure the force-discover option. The range is 4 through 64. [edit interfaces ge-0/0/2 unit 0 family inet set retransmission-attempt 6Set the interval (in seconds) allowed between retransmissionAttempts. You then specifyThe DHCP client identifier as 00:0a:12:00:12:12 in hexadecimal. ConfigureThe two DHCP clients in chassis cluster mode.For DHCP clients, you specify the interface as reth1, set theLogical unit as 0, and create a DHCP inet family. [edit interfaces ge-0/0/2 unit 0 family inet set options no-hostnameIn this example, you configure two SRX Series devices as DHCPClients and a third SRX Series device as a DHCP server. The range is from 60 through 2,147,483,647 seconds. You set the DHCP lease time as 86,400Seconds. You setThe options no-hostname if you do not want the DHCP client to sendThe hostname with the packets. Dancing drums slot download[edit interfaces reth1 unit 0 family inet set client-identifier user-id ascii 00:0a:12:00:12:12Set the hostname if you do not want the DHCP client toSend hostname in the packets (RFC option code 12). Edit interfaces reth1 unit 0 family inet dhcp-clientValue. You specifyThe server group as g1 and enable the DHCP local server on interfaceTo quickly configure this example, copy theFollowing commands, paste them into a text file, remove any line breaks,Change any details necessary to match your network configuration,Copy and paste the commands into the CLI at the hierarchyLevel, and then enter commit from configuration mode.Configure DHCP Client 1 and Client 2: set interfaces reth1 unit 0 family inet dhcp-client set interfaces reth1 unit 0 family inet dhcp-client client-identifier user-id ascii 00:0a:12:00:12:12 set interfaces reth1 unit 0 family inet dhcp-client options no-hostname set interfaces reth1 unit 0 family inet dhcp-client lease-time 86400 set interfaces reth1 unit 0 family inet dhcp-client retransmission-attempt 6 set interfaces reth1 unit 0 family inet dhcp-client retransmission-interval 5 set interfaces reth1 unit 0 family inet dhcp-client server-address 203.0.113.1 set interfaces reth1 unit 0 family inet dhcp-client vendor-id etherConfigure chassis cluster on Client 1 and Client 2: set chassis cluster reth-count 2 set chassis cluster control-link-recovery set chassis cluster heartbeat-interval 1000 set chassis cluster redundancy-group 1 node 0 priority 100 set chassis cluster redundancy-group 1 node 1 priority 1 set chassis cluster redundancy-group 0 node 0 priority 100 set chassis cluster redundancy-group 0 node 1 priority 1 set interfaces ge-0/0/1 gigether-options redundant-parent reth1 set interfaces ge-4/0/1 gigether-options redundant-parent reth1 set interfaces reth1 redundant-ether-options redundancy-group 1Configure the DHCP server: set system service dhcp-local-server group g1 interface ge-0/0/2.0 set interfaces ge-0/0/2 unit 0 family inet address 203.0.113.1/24 set access address-assignment pool p1 family inet network 203.0.113.0/24 set access address-assignment pool p1 family inet range r1 low 203.0.113.5 set access address-assignment pool p1 family inet range r1 high 203.0.113.20To configure the devices as DHCP clients:Specify the DHCP client interface. The range is from 4 through 64, and the default is 4 seconds.Finally, you set the IPv4 address of the preferred DHCP server to203.0.113.1 and the vendor class ID to ether.For the DHCP server, configure the SRX Series device as a DHCPLocal server with minimum DHCP local server configurations. You set the retransmission interval to 5Seconds. The range is from 0 through6, and the default is 4. The range is 4 through 64. [edit interfaces reth1 unit 0 family inet set retransmission-attempt 6Attempts. [edit interfaces reth1 unit 0 family inet set lease-time 86400Packet.
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