Why do some routing policies not take effect for a routing protocol on S series switches

When a routing policy contains the routing attribute modification action, the routing policy does not take effect because the routes advertised by the routing protocol cannot carry the attribute. For example, a routing policy is configured to modify the next-hop attribute of OSPF external routes, the routing policy does not take effect because DD packets used to advertise routes do not carry the next-hop attribute.
Some routing policies only take effect for certain protocols. For example, the policy where community attributes are matched can only be applied to BGP. In addition, the BGP protocol runs based on point-to-point neighbor relationships; therefore, some policies can be used only on a peer device.

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