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Networking Fundamentals · Intermediate

All-Routers Multicast Address

The link-local multicast group ff02::2, which every IPv6 router joins.

Definition

Hosts send Router Solicitations to ff02::2 to request immediate Router Advertisements. A Cisco router joins this group only after ipv6 unicast-routing is enabled.

Example

A booting laptop sends an RS to ff02::2 to find its router.

Exam tip

If a Cisco router is not sending RAs, check that ipv6 unicast-routing is enabled.

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