What is the consequence of configuring a router with the ipv6 unicast-routing global configuration command?
- All router interfaces will be automatically activated.
- The IPv6 enabled router interfaces begin sending ICMPv6 Router Advertisement messages.
- Each router interface will generate an IPv6 link-local address.
- It statically creates a global unicast address on this router.
Explanation: The ipv6 unicast-routing global configuration command is a critical step in IPv6 implementation because Cisco routers do not function as IPv6 routers by default. Once this command is issued, the router joins the all-routers multicast group and its IPv6-enabled interfaces begin transmitting ICMPv6 Router Advertisement (RA) messages periodically or in response to host solicitations. These RA messages are essential for dynamic address allocation, as they provide neighboring hosts with vital information such as the network prefix, prefix length, and the default gateway address. While link-local addresses are generated automatically when IPv6 is enabled on an interface, the global unicast routing command is specifically what triggers the router to begin its active role in directing IPv6 traffic and facilitating stateless address autoconfiguration (SLAAC).
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