The Anycast IP-based Layer 3 gateway solution is a lightweight gateway router redundancy protocol that is enabled only on VLANs. It does not exchange any control packets between routers and supports only the active/active data plane forwarding mode. The primary node acts as the Anycast Gateway IP address owner in the VLAN and will respond to the ARP requests for gateway anycast IP.
Note: The IP Anycast Gateway feature only works when VLT configurations are present in the switch. If you enable this feature without VLT domain configuration, the anycast gateway configuration remains inactive. Be sure to configure the same IP anycast IPv4 or IPv6 address and the same virtual global MAC address on both VLT nodes. Anycast IP gateway routing and VRRP are mutually exclusive and cannot be configured on the same VLAN simultaneously. Customers can enable IP Anycast Gateway for up to 512 Layer 3 VLANs.