Track 2 - Internet Routing and IP Network management (7-Oct-96)

Autonomous Systems and EGP

2) New BGP Features

B)Destination Preference Attribute


DPA feature

Destination Preference Attribute

  1. Optional Transitive Attribute

  2. Allows for symetric paths by AS

    (here need a picture from the usage document)

  3. Any Peer along pathway can change the Destination Preference Value

  4. Current problems with DPA

    • Not widely used because of ability to change mid-stream

    • Communities used instead

  5. Gated syntax

  6. Cisco has not implemented the Destination Preference Attribute due to implication on the route selection