Related Documentation
- MX, PTX Series
- DHCP Auto Logout Overview
- MX Series
- Automatically Logging Out DHCP Clients
Clearing DHCP Bindings for Subscriber Access
This topic provides the procedure you use to display current DHCP bindings, clear selected bindings, and verify that the specified bindings are successfully cleared.
Subscriber management enables you to clear DHCP bindings at several different levels for DHCP local server and DHCP relay agent. For example, you can clear the DHCP bindings on all interfaces, a group of interfaces, or a specific interface. You can also clear DHCP bindings based on IP address, MAC address, session-ID, DHCPv6 prefix, DHCPv6 Client ID, FPC, PIC, port, VLAN, or stacked VLAN (S-VLAN).
This topic includes examples to show several variations of the clear DHCP binding feature. The examples use DHCP local server commands; however, the procedure and commands are similar for DHCP relay agent, DHCPv6 local server, and DHCPv6 relay agent.
To clear bindings and verify the results for a specific IP address:
- Display current bindings. Issue the appropriate variation
of the show dhcp server binding command.
user@host> show dhcp server binding 2 clients, (2 bound, 0 selecting, 0 renewing, 0 rebinding) IP address Hardware address Type Lease expires at 192.168.32.1 90:00:00:01:00:01 active 2011-10-17 11:38:47 PST 192.168.32.3 90:00:00:02:00:01 active 2011-00-17 11:38:41 PST
- Clear the binding you want to remove.
user@host> clear dhcp server binding 192.168.32.1
- Verify that the binding has been cleared.
user@host> show dhcp server binding 1 clients, (1 bound, 0 selecting, 0 renewing, 0 rebinding) IP address Hardware address Type Lease expires at 192.168.32.3 90:00:00:02:00:01 active 2011-00-17 11:38:41 PST
The following examples show variations of the clear DHCP binding feature. The examples use the DHCP local server version of the commands.
 | Note: IP demux interfaces are not supported by the show and clear DHCP bindings commands for DHCP local server and DHCP relay agent. |
To clear all bindings:
To clear bindings on a specific interface:
To clear all bindings over an interface. This example uses the wildcard option.
To clear bindings on top of a specific VLAN. This example clears all bindings on top of VLAN 100.
To clear bindings for a specific S-VLAN. This example clears bindings on S-VLAN 100-200.
To clear all bindings on top of all demux VLANs:
To clear all bindings on top of an underlying interface. This example clears the bindings on all demux VLANS on top of interface ae0:
To clear PPP bindings. This example uses the wildcard feature and clears the PPP bindings over interface pp0.100 and pp0.200.
To clear all bindings on an FPC. This example uses the wildcard feature and clears all DHCP bindings on FPC 1.
To clear all bindings on a PIC. This example uses the wildcard feature and clears all DHCP bindings on FPC 1, PIC 0.
To clear all bindings on a port. This example uses the wildcard feature and clears all DHCP bindings on FPC 1, PIC 0, port 0.
Related Documentation
- MX, PTX Series
- DHCP Auto Logout Overview
- MX Series
- Automatically Logging Out DHCP Clients
Published: 2013-02-11
Related Documentation
- MX, PTX Series
- DHCP Auto Logout Overview
- MX Series
- Automatically Logging Out DHCP Clients
