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Feature Description - IP Services 01

NE05E and NE08E V300R003C10SPC500

This is NE05E and NE08E V300R003C10SPC500 Feature Description - IP Services
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DHCP Server Dual-Device Hot Backup

DHCP Server Dual-Device Hot Backup

Networking Description

DHCP server dual-device hot backup effectively implements rapid service switching by keeping user session information synchronized on the master and backup devices in real time on the control plane and forwarding plane. The user session information (including the IP address, MAC address, DHCP lease, and Option 82) generated during user access from the master device is synchronized to the backup device. When VRRP detects a link failure on the master device, a VRRP packet is sent to adjust the priority and a master/backup switchover is triggered. After the master/backup switchover is implemented, the original backup device takes over to perform address assignment for new users and renewal for online users. Users are not aware of DHCP server switching.

Figure 4-10 describes the typical networking with a VRRP backup group deployed. Here, DeviceA is the master device, and DeviceB is the backup device. Both DeviceA and DeviceB are DHCP servers that assign IP addresses to clients. In normal cases, DeviceA performs user access and renewal. When DeviceA or the link between DeviceA and the switch becomes faulty, a VRRP master/backup switchover is implemented and DeviceB takes over to become the master device. DeviceB can properly perform address assignment for new users and renewal requests for online users only when user session information on DeviceA has been synchronized to DeviceB.

Figure 4-10 VRRP networking

Feature Deployment

To prevent abnormalities of new user access and online user renewal after a master/backup switchover due to a failure to synchronize user session information from DeviceA to DeviceB, deploy DHCP server dual-device hot backup on DeviceA and DeviceB.

Figure 4-11 DHCP server dual-device hot backup

As shown in Figure 4-11, after DHCP server dual-device hot backup is deployed on DeviceA and DeviceB, DeviceB synchronizes with DeviceA for user session information in real time. Once a VRRP master/backup switchover occurs, DeviceB performs new user access or online user renewal based on the user session information synchronized from DeviceA.

Updated: 2019-01-14

Document ID: EDOC1100058931

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