Why are the four QoS steps (classification, queuing, scheduling, and marking/remarking) executed twice for every packet entering a 7750 SR router?

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Do Hien · Accepted Answer

Once before going through the switching fabric, and once more before going onto the egress port.

Do Hien · Answer

Once before going through each of the redundant switching fabrics.

Do Hien · Answer

To protect against failure of either ingress or egress card.

Do Hien · Answer

Once to decide if the packet is in-profile or out-of-profile, and once more to process the packet according to its profile.

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