Router Advertisements (RAs)
RAs are used in both static and dynamic routing environments and are transmitted per-VLAN from the routing switch for host configuration. RAs carry configuration settings for parameters, such as network prefix and neighbor discovery, and are also used to direct hosts to DHCPv6 servers for configuration settings. Enabling IPv6 routing automatically enables RA transmission on all IP routing interface where it has not been suppressed with one of the following commands:
Global Config Context:Switch(config)# ipv6 nd suppress–ra
VLAN Config Context:Switch(vlan–1)# ipv6 nd ra suppress
For more information on this topic, see IPv6 Router Advertisements (RAs).