BGP attributes overview

BGP attributes is a metric used to describe the characteristics of a BGP paths. Attributes are conatained in update messages passed between BGP peers for advertise routers.

BGP attributes are broadly divided into two types -

• Well know
• Optional

Well Known attributes are divided into two types -

• Mandatory
• Descretionary

Mandatory attributes are divided into three types -

• AS Path
• Next Hop
• Origin

Origin attributes divided into three types -

• Internal (i)
• External (e)
• Incomplete (?)

Descretionary attributes are divided into two types -

• Local Preference
• Atomic Aggregate

Optional attributes are divided into two types - 

• Transitive
• Non Transitive

Transitive attributes are divided into two types -

• Aggregator
• Community

Community attributes are divided into three types -

• No-export
• No advertise
• Internet

Non transitive attributes are divided into three types -

• MED (Multi Exit Discriminator).
• Originator ID
• Cluster-list.

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