In the document that you refered, I can see that "This means that the preferred interface over which to reply to a client is the interface on which the CSS originally received the request from the client.".
By interface we can assume that we are talking of VLANs? They have only one interface connected in trunk mode. This means that all requests arrive to the same interface but on different VLANs.
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With Vignesh R. P.Welcome to the Cisco Support Community Ask the Expert
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