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Configuring Static DHCP IP Addresses

Configuring Static DHCP IP Addresses for DHCP snooping (ELS)

Note:

This task uses Junos OS for EX Series switches with support for the Enhanced Layer 2 Software (ELS) configuration style. If your switch runs software that does not support ELS, see Configuring Static DHCP IP Addresses for DHCP snooping (non-ELS). For ELS details, see Using the Enhanced Layer 2 Software CLI.

You can add static (fixed) IP addresses and bind them to fixed MAC addresses in the DHCP snooping database. These bindings are labeled static in the database, while those bindings that have been added through the process of DHCP snooping are labeled dynamic. Static IPv6 address assignment is also available for DHCPv6.

Before you can perform this procedure, you must configure the VLAN. See Configuring VLANs for EX Series Switches with ELS Support (CLI Procedure).

To configure a static IP address to MAC address (IP-MAC) binding in the DHCP snooping database, you must first create a group of access interfaces under the [edit vlans vlan-name forwarding-options dhcp-security] hierarchy. Creating this group automatically enables DHCP snooping, which is a prerequisite for creating the DHCP snooping database. You can then configure a specific interface within the group to have a static IP address that is bound to a fixed MAC address. If you want to have multiple static IP addresses, configure additional interfaces within the same group.

Note:

On switches that support DHCPv6, creating the group of interfaces will automatically enable both DHCP and DHCPv6 snooping.

To configure a static IP-MAC address binding in the DHCP snooping database:

To configure a static IPv6-MAC address binding in the DHCPv6 snooping database:

In the following example, a device with static IP allocation is connected to the ge-0/0/1 interface, which belongs to vlan-A. To configure this device to connect to the external network:

To verify that the configuration is configured on the device:

To verify that a binding entry is created for the static client:

Configuring Static DHCP IP Addresses for DHCP snooping (non-ELS)

You can add static (fixed) IP addresses and bind them to fixed MAC addresses in the DHCP snooping database. These bindings are labeled static in the database, while those bindings that have been added through the process of DHCP snooping are labeled dynamic.

Note:

This task uses Junos OS for EX Series switches that do not support Enhanced Layer 2 Software (ELS) configuration style. If your switch runs software that does support ELS, see Configuring Static DHCP IP Addresses for DHCP snooping (ELS). For ELS details, see Using the Enhanced Layer 2 Software CLI.

To configure a static IP-MAC address binding in the DHCP snooping database:

To configure a static IP-MAC address binding in the DHCPv6 snooping database:

To view results of the configuration steps before committing the configuration, type the show command at the user prompt.

To commit these changes to the active configuration, type the commit command at the user prompt.

Configuring Static DHCP IP Addresses for DHCP snooping (MX routers)

You can add static (fixed) IP addresses and bind them to fixed MAC addresses in the DHCP snooping database. These bindings are labeled as static in the database, while those bindings that have been added through the process of DHCP snooping are labeled dynamic.

To configure a static IP address/MAC address binding in the DHCP snooping database, you must first create a group of access interfaces under [edit bridge-domains bridge-domain-name forwarding-options dhcp-security]. Creating this group automatically enables DHCP snooping, which is a prerequisite for creating the DHCP snooping database. The following procedure shows the configuration in two steps, but it can be done in one. You can then configure a specific interface within the group to have a static IP address that is bound to a fixed MAC address. If you want to have multiple static IP addresses, configure additional interfaces within the same group.

To configure a static IP address and MAC address binding in the DHCP snooping database:

  1. Create a group by including an access interface:
  2. Configure a static IP address: