Does the DHCP server support VRRP


In V100R006C00 and later versions, the master device in the VRRP group assigns IP addresses. The IP address pool information on the master router cannot be synchronized to the slave routers in the VRRP group. Therefore, you are not advised to configure the DHCP server for VRRP groups.

Other related questions:
What is the support of DHCP on an AR
The support for DHCP functions on the AR is as follows: - DHCP server: All AR models of all versions support the DHCP server. - DHCP relay: All AR models of all versions support the DHCP relay agent. - DHCP snooping: Starting from V200R003C00, all AR models support DHCP snooping. - DHCP client: All AR models of all versions support the DHCP client.

Whether VRRP on the AR router supports authentication
VRRPv2 supports plain-text authentication and MD5 authentication modes. VRRPv3 does not support authentication.

Whether an S series switch supports VRRP
S600-E series switches do not support VRRP. The following lists S series switch product support for VRRP excluding S1700: - S1720: Not supported by S1720GFR; supported by S1720GW-E and S1720GWR-E - S2700: Not supported. - S3700: Not supported by SI series; supported by EI and HI series - S5700: Not supported by SI series; supported by S5720-LI and S5720S-LI, but not supported by other LI series; supported by EI and HI series - S6700: Supported - S7700: Supported - S9700: Supported - S9300: Supported - S12700: Supported

FAQ-A backup solution of DHCP server and VRRP
When VRRP hot standby group is used as the gateway, DHCP servers may not back up each other. Because the VRRP group does not support backup of the DHCP address pool and address allocation status, the master and slave devices are independent DHCP servers. There are problems as follows: 1. If the DHCP server and address pool are configured only on the master, the DHCP server goes down when the master is down. After the slave upgrades to the master, it cannot assign addresses to clients. 2. If the same DHCP server and address pool are configured on both master and slave devices, address conflict may occur. You can use the following methods to solve the problem: 1. Configure CSS or iStack to virtualize two devices into one, and configure it as the DHCP server. This solution implements backup while eliminating conflicts. 2. Both master and slave devices are configured as DHCP servers, but their address pools cannot be the same. You can divide an IP address segment into two parts, with the equal number of addresses assigned to master and slave devices. This solution prevents address conflict. When the master goes down, some devices need to apply for addresses from the slave and their IP addresses may change. Ensure that there are sufficient addresses for clients to apply for.

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