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[fib algo][dxr] Optimize trie updating.

Description

[fib algo][dxr] Optimize trie updating.

Don't rebuild in vain trie parts unaffected by accumulated incremental
RIB updates.

PR: 257965
Tested by: Konrad Kreciwilk
MFC after: 3 days

Details

Provenance
zecAuthored on Sep 15 2021, 8:36 PM
Parents
rG442c8a245ee3: [fib algo][dxr] Fix undefined behavior.
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