BGP Attributes
BGP
attribute is a metric used to describe the
Characteristics
of a BGP path. Attributes are contained in update messages passed between BGP
peers for advertise routers.
BGP attributes are
divided into two types -
a)
Well Known
b)
Optional
Well Known attributes are divided into two types -
a)
Mandatory
b)
Discretionary
**
Mandatory attributes are -
a)
AS Path
b)
Next Hop
c)
Origin
**
Origin attributes divided into three types -
a)
Internal(i)
b)
External(e)
c)
Incomplete(?)
**
Discretionary attributes are -
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 -
a)
No-export
b)
No advertise
c)
Internet
d)
Local AS.
**
Non transitive attributes are -
a)
MED (Multi Exit Discriminator).
b)
Originator
d)
Cluster ID.
