Routing-policies

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 | Policy Tool      | Used For                 |

| ---------------- | ------------------------ |

| Prefix-list      | Fast prefix filtering    |

| Route-map        | Conditional policy logic |

| ACL              | Legacy filtering         |

| BGP Community    | Route tagging            |

| AS-Path filter   | Loop & transit control   |

| Route tag        | Redistribution safety    |

| PBR              | Traffic steering         |

| Distribute-list  | Basic filtering          |

| Policy-statement | Modern policy framework  |

| RPKI             | Route security           |



OSPF route tags are carried only in Type-5 and Type-7 LSAs as a 32-bit external route tag field. They are flooded across the domain, ignored by SPF, and used solely for policy control such as loop prevention during redistribution.

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