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CCNP Enterprise Core (350-401) Cisco Routing

BGP Path Attributes

BGP will use path attributes with each network path.

These path attributes provide control of routing policies within BGP, these path attributes are classified as:

  • Optional non-transitive
  • Optional transitive
  • Well-known discretionary
  • Well-known mandatory

Well known attributes must be recognised by all BGP implementations, with mandatory attributes being included with every prefix advertisement. Discretionary attributes might be included with a prefix advertisement.

Optional attributes do not need to be recognised or implemented by all BGP implementations. They can be set in a way that they transfer from AS to AS as they are advertised through the network. These are known as transitive path attributes. Non-transitive attributes do the opposite and do not transfer through the network.

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