Can VRRP Master and Backup Share One License for Extended Functions and Resources?

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A license can be shared by all device ESNs only when the devices set up a CSS/stack. In other scenarios including the VRRP scenario, a separate license needs to be purchased for each device.

Other related questions:
Whether multiple S series switches can form a VRRP group
S600-E series switches do not support VRRP. S series switches (S1700 excluded) support a VRRP group composed of one master and multiple backups. Typically, VRRP is configured on two devices.

Determine the VRRP master and backup devices for an S series switch
The following methods can be used to determine VRRP master and backup devices for S series switches: - Specify master and backup devices in a VRRP group by setting different priorities. The device of a higher priority functions as a master, and the device of a lower priority functions as a backup. - When two devices of the same priority restart, the device that switches to the master state first functions as the master. The purpose is to decrease an unnecessary switchover.

Example of configuring VRRP active/standby backup on an AR router
The roadmap of configuring VRRP active/standby backup on an AR router to implement gateway redundancy is as follows: 1. Configure IP addresses and routing protocols for different device interfaces to enable network-layer connection among different devices. 2. Configure a VRRP group on Router A and Router B, respectively. Configure a high priority and set preemption delay to 20s on Router A and configure Router A as a master device to bear and forward traffic. Configure a low priority and configure Router B as a backup device to implement gateway redundancy. Configure a VRRP group. # Create VRRP 1 on Router A, set its priority to 120, and set the preemption delay to 20s. [RouterA] interface gigabitethernet 2/0/0 [RouterA-GigabitEthernet2/0/0] vrrp vrid 1 virtual-ip 10.1.1.111 //Configure a virtual IP address. [RouterA-GigabitEthernet2/0/0] vrrp vrid 1 priority 120 //Set priority to 120. [RouterA-GigabitEthernet2/0/0] vrrp vrid 1 preempt-mode timer delay 20 //Set the preemption delay to 20s. [RouterA-GigabitEthernet2/0/0] quit # Create VRRP 1 on Router B, and set its priority to a default value 100. [RouterB] interface gigabitethernet 2/0/0 [RouterB-GigabitEthernet2/0/0] vrrp vrid 1 virtual-ip 10.1.1.111 [RouterB-GigabitEthernet2/0/0] quit For details about the configuration, see the URL: Example for Configuring a VRRP Group in Active/Standby Mode.

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