Answer Posted / shahin

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 -

a) Well Known
b) Optional.


Well Known attributes are divided into two types -

a) Mandatory
b) Descretionary

** Mandatory attributes are divided into three types -

a) AS Path
b) Next Hop
c) Origin

** Origin attributes divided into three types -

a) Internal(i)
b) External(e)
c) Incomplete(?)

** Descretionary attributes are divided into two types -

a) Local Preference
b) Atomic Aggregate



Optional attributes are divided into two types -

a) Transitive
b) Non Transitive


** Transitive attributes are divided into two types -

a) Aggregator
b) Community


** Community attributes are divided into for types -

a) No-export
b) No advertise
c) Internet
d) Local AS.

&& Non transitive attributes are divided into three types -

a) MED (Multi Exit Discriminator).
b) Originator
d) Cluster ID.




I'll explain all attributes on next post..!!!

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