On an IPv6 overlay network, IPv6 host neighbor discovery is implemented through NS multicast. When a gateway receives an NS message for IPv6 address resolution, it forwards the message in a multicast way in its BD. If the number of received NS messages within a period is large and all of them need to be forwarded, too many VXLAN network resources will be consumed, affecting proper service running. To address this issue, NS multicast suppression needs to be implemented. After this function is enabled, when receiving an NS message, the gateway checks whether it can obtain the destination user information in the NS message. If the gateway can obtain the destination user information, it performs multicast-to-unicast processing to reduce or suppress NS message flooding.
The system view is displayed.
The BGP view is displayed.
The BGP-EVPN address family view is displayed.
By default, the BGP-EVPN address family view is disabled.
By default, a device does not advertise ND or IRBv6 routes to a BGP EVPN peer. Configure advertisement of ND or IRBv6 routes to implement NS multicast suppression. The following two configurations cannot coexist.