Dhcp table not updating ip assignments
The Cisco IOS DHCP server and relay agent are enabled by default.
You can verify if they have been disabled by checking your configuration file.
This requires that the layer 3 switch or router between the MX and the DHCP clients have DHCP relay functionality configured to relay DHCP requests for that subnet to the MX.
This is not to be confused with DHCP relay on the MX itself, which is described at the bottom of this page.
The static IP will still be configured on the device if you go to the Uplink configuration page on the Local Status Page or, for MS switches and MR access points, on the device's details page in Dashboard under "set IP address".
Even though the device will have a different IP via DHCP, it will continue to ARP for the gateway configured statically.
" in Dashboard: In the case that the device cannot get an ARP reply from its default gateway, it will revert back to using DHCP for its IP configuration.
This is an intended function to bring the device online; if the device can't reach its default gateway, it will never report to Dashboard.
Required Ports Make sure that the following ports are open to allow a hardware load balancer: User Provisioning Ensure that users have been provisioned and enabled on Lync Server. In Lync Server Control Panel, go to the Users tab and search for the user.To find information about feature support and configuration, use the "Feature Information for the Cisco IOS DHCP Server" section.•Prerequisites for Configuring the DHCP Server •Information About the Cisco IOS DHCP Server •How to Configure the Cisco IOS DHCP Server •Configuration Examples for the Cisco IOS DHCP Server •Additional References •Feature Information for the Cisco IOS DHCP Server Before you configure the Cisco IOS DHCP server, you should understand the concepts documented in the "DHCP Overview" module.Configuring the Cisco IOS DHCP Server Contents Prerequisites for Configuring the DHCP Server Information About the Cisco IOS DHCP Server Overview of the DHCP Server DHCP Server Address Allocation Using Option 82 How to Configure the Cisco IOS DHCP Server Configuring a DHCP Database Agent or Disabling Conflict Logging Database Agents Address Conflicts Restrictions Excluding IP Addresses Configuring a DHCP Address Pool DHCP Address Pool Conventions DHCP Address Pool Selection DHCP Server Address Pool with Multiple Disjoint Subnets Prerequisites Restrictions Configuring Manual Bindings Address Bindings Restrictions Troubleshooting Tips Configuring DHCP Static Mapping DHCP Database Creating the Static Mapping Text File Configuring the DHCP Server to Read a Static Mapping Text File Examples Customizing DHCP Server Operation Ping Packet Settings Option to Ignore All BOOTP Requests Configuring a Remote Router to Import DHCP Server Options from a Central DHCP Server Configuring the Central DHCP Server to Update DHCP Options Configuring the Remote Router to Import DHCP Options Configuring DHCP Address Allocation Using Option 82 DHCP Address Allocation Using Option 82 Feature Design Usage Scenario for DHCP Address Allocation Using Option 82 DHCP Class Capability Restrictions for DHCP Address Allocation Using Option 82 Enabling Option 82 for DHCP Address Allocation Troubleshooting Tips Defining the DHCP Class and Relay Agent Information Patterns Prerequisites Troubleshooting Tips Defining the DHCP Address Pool Configuring a Static Route with the Next-Hop Dynamically Obtained Through DHCP Prerequisites Restrictions Clearing DHCP Server Variables Configuration Examples for the Cisco IOS DHCP Server DHCP Database Agent Configuration: Example DHCP Address Pool Configuration: Example DHCP Address Pool Configuration with Multiple Disjoint Subnets: Example Excluding IP Addresses: Example Manual Bindings Configuration: Example Static Mapping Configuration: Example Option to Ignore all BOOTP Requests: Example DHCP Server Options Import: Example DHCP Address Allocation Using Option 82: Example Static Routes Using a DHCP Default Gateway: Example Additional References Related Documents Standards MIBs RFCs Technical Assistance Feature Information for the Cisco IOS DHCP Server (DHCP) server and relay agent software.The Cisco IOS DHCP server is a full DHCP server implementation that assigns and manages IP addresses from specified address pools within the router to DHCP clients.The clients interact with servers using DHCP messages in a DHCP conversation to obtain and renew IP address leases.is any network-enabled device that supports the ability to communicate with a DHCP server in compliance with RFC 2131, for the purpose of obtaining dynamic leased IP configuration and related optional information.You can manually configure IP addresses at each computer, or you can install a Dynamic Host Configuration Protocol (DHCP) server that can assign IP addresses to each client computer or device on the network.No manual configuration is required on the IP phones because the phones can receive only DHCP-assigned IP addresses.Double-click the user to see if he or she is enabled and have telephony type Enterprise Voice.Note The DHCP architecture consists of DHCP clients, DHCP servers, and DHCP relay agents on a network.