The difference between BGP third-party next hop and route redirection

Experiment topology:

R1 configuration:

R2 configuration:

R3 configuration:

Verify:

From the BGP general rule 1.1.1.0/24 's next hop should be R2 (123.1.1.2) but it has automatically changed to R1 123.1.1.1. This is the third party's next jump. This is a change in the control level.

Route redirection is a change in the forwarding of the data plane, and the next hop does not change. (Refer to My route redirection experiment)

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