- Nexthop – Should be accessible, otherwise, drop.
- Largest Weight. Not part of the routing update.
- Largest Local Preference. Prefered path to a remote destination. Part of the routing update. Default is 100. Local to the AS.
- Originated by BGP running on this computer.
- Shortest AS-PATH.
- Lowest origin type. IGP < EGP < Incomplete
- Lowest MED attribute – Hint to neighbours on which paths to choose to an AS with multiple entry points. Default is 0. Exchanged between AS.
- External path over Internal Path
- Closest IGP neighbour
- Oldest route – for ebgp
- Lowested BGP router ID
- Lowest neighbour IP address
Cisco R&S: Attributes used by BGP in route selection
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