[doc] active-active dual ToR HLD#1005

Merged

zjswhhh merged 15 commits intosonic-net:masterfrom

zjswhhh:dualToR

Jul 14, 2022

Commits on May 23, 2022

Commits on May 24, 2022

Commits on May 27, 2022

updates: add IPinIP tunnel; add DB changes; add active-standby comparison; re-add default route in decision table; add content table; add flow diagrams.
zjswhhh
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replace table images, update requirement overview
zjswhhh
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Commits on May 31, 2022

adjust decision table; remove bandwidth calculation as 2 member lags are not hard requirement
zjswhhh
committed

Commits on Jun 2, 2022

Commits on Jun 8, 2022

add further enhancement
zjswhhh
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Commits on Jul 12, 2022

wording change
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