342• Instance ID: Instance ID for a link.• 0: Reserved. It must be 0.OSPFv3 LSA typesOSPFv3 sends routing information in LSAs, which, as defined in RFC2740, have the followingtypes:• Router-LSA: Originated by all routers. This LSA describes the collected states of the router'sinterfaces to an area. Flooded throughout a single area only.• Network-LSA: Originated for broadcast and NBMA networks by the Designated Router. ThisLSA contains the list of routers connected to the network. Flooded throughout a single areaonly.• Inter-Area-Prefix-LSA: Similar to Type 3 LSA of OSPFv2, originated by ABRs, and floodedthroughout the LSA's associated area. Each Inter-Area-Prefix-LSA describes a route with IPv6address prefix to a destination outside the area, yet still inside the AS (an inter-area route).• Inter-Area-Router-LSA: Similar to Type 4 LSA of OSPFv2, originated by ABRs and floodedthroughout the LSA's associated area. Each Inter-Area-Router-LSA describes a route to ASBR.• AS-external-LSA: Originated by ASBRs, and flooded throughout the AS (except Stub andNSSA areas). Each AS-external-LSA describes a route to another AS. A default route can bedescribed by an AS external LSA.• Link-LSA: A router originates a separate Link-LSA for each attached link. Link-LSAs have link-local flooding scope. Each Link-LSA describes the IPv6 address prefix of the link and Link-local address of the router.• Intra-Area-Prefix-LSA: Each Intra-Area-Prefix-LSA contains IPv6 prefix information on a router,stub area, or transit area information, and has area flooding scope. It was introducedbecause Router-LSAs and Network-LSAs do not contain address information.RFC 5187 defines the Type 11 LSA, Grace-LSA. A Grace-LSA is generated by a GR Restarter atreboot and transmitted on the local link. The restarter describes the cause and interval of thereboot in the Grace-LSA to tell its neighbors that it performs a GR operation.Timers of OSPFv3Timers in OSPFv3 are as follows:• OSPFv3 packet timer• LSA delay timer• SPF timer• GR timerOSPFv3 packet timerHello packets are sent periodically between neighboring routers for finding and maintainingneighbor relationships, or for DR or BDR election. The hello interval must be identical on
