rfc9818v2.txt   rfc9818.txt 
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LPD-3: The prefix assigned to a link MUST NOT change in the absence LPD-3: The prefix assigned to a link MUST NOT change in the absence
of a local policy or a topology change. of a local policy or a topology change.
LPD-4: After LAN link prefix assignments, the IPv6 CE router MUST LPD-4: After LAN link prefix assignments, the IPv6 CE router MUST
keep the remaining IPv6 prefixes available to other routers keep the remaining IPv6 prefixes available to other routers
via Prefix Delegation. via Prefix Delegation.
LPD-5: IPv6 CE routers MUST maintain a local routing table that is LPD-5: IPv6 CE routers MUST maintain a local routing table that is
dynamically updated with leases and the associated next hops dynamically updated with leases and the associated next hops
as they are delegated to clients. Packets with destination as they are delegated to clients. Absent explicit
addresses in a delegated prefix MUST be routed to that filtering, packets with destination addresses in a delegated
prefix regardless of which interface they are received on. prefix MUST be forwarded to that prefix regardless of which
When a delegated prefix is released or expires, the interface they are received on. When a delegated prefix is
associated route MUST be removed from the IPv6 CE router's released or expires, the associated route MUST be removed
routing table. A delegated prefix expires when the valid from the IPv6 CE router's routing table. A delegated prefix
lifetime assigned in the IA_PD expires without being expires when the valid lifetime assigned in the IA_PD
renewed. When a prefix is released or expires, it MUST be expires without being renewed. When a prefix is released or
returned the pool of available prefixes. expires, it MUST be returned the pool of available prefixes.
LPD-6: By default, the IPv6 CE router filtering rules MUST allow LPD-6: By default, the IPv6 CE router filtering rules MUST allow
forwarding of packets with an outer IPv6 header containing a forwarding of packets with an outer IPv6 header containing a
source address belonging to delegated prefixes, along with source address belonging to delegated prefixes, along with
reciprocal packets from the same flow, following the reciprocal packets from the same flow, following the
recommendations of [RFC6092]. This updates WPD-5 of recommendations of [RFC6092]. This updates WPD-5 of
[RFC7084] to not drop packets from prefixes that have been [RFC7084] to not drop packets from prefixes that have been
delegated. IPv6 CE routers MUST continue to drop packets, delegated. IPv6 CE routers MUST continue to drop packets,
including destination address, that are not assigned to the including destination address, that are not assigned to the
LAN or delegated. LAN or delegated.
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