Does switching on same card use backplane BW?

If, say, I am doing MLS ( L3 switching ) on a CAT 5000, and I setup two
hosts, one on port 1 and the other one port 2 on the same card ( ws-x5201R
which does the L3 MAC rewrite itself ), does this type of setup use any
backplane bandwidth?

Or does it still have to pass through the SUP?

TIA

Scotty


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