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[mle] retain direct child cache entries on Addr Solicit Response TX #9956

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Mar 22, 2024
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[mle] retain direct child cache entries on Addr Solicit Response TX #9956

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6 changes: 5 additions & 1 deletion src/core/thread/mle_router.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3674,7 +3674,10 @@ void MleRouter::SendAddressSolicitResponse(const Coap::Message &aRequest,

// If assigning a new RLOC16 (e.g., on promotion of a child to
// router role) we clear any address cache entries associated
// with the old RLOC16.
// with the old RLOC16 unless the sender is a direct child. For
// direct children, we retain the cache entries to allow
// association with the promoted router's new RLOC16 upon
// receiving its Link Advertisement.

if ((aResponseStatus == ThreadStatusTlv::kSuccess) && (aRouter != nullptr))
{
Expand All @@ -3684,6 +3687,7 @@ void MleRouter::SendAddressSolicitResponse(const Coap::Message &aRequest,
oldRloc16 = aMessageInfo.GetPeerAddr().GetIid().GetLocator();

VerifyOrExit(oldRloc16 != aRouter->GetRloc16());
VerifyOrExit(!RouterIdMatch(oldRloc16, GetRloc16()));
Get<AddressResolver>().RemoveEntriesForRloc16(oldRloc16);
}

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