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Link Identification Routers listen for all prefixes on a link In general, all prefixes included in RAs New option for learned prefixes One noted as LinkID prefix MUST be included in RAs Hosts SHOULD include a landmark in RSs If the landmark is on the link, routers may send an abbreviated RA containing only the landmark If the landmark is not on the link or there’s no landmark routers send a Complete RA Unsolicited RAs MAY carry a subset of prefixes but MUST include the LinkID prefix |