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BGP Messages:
Open Msg
Notification Msg
Open
Keep Alive
Update Message
BGP Attribute:

Well Known/ WK:

       Mandatory: Origin , AS-Path , Next-Hop
Discretionary: Local-pref


Optional: 

  
Transitive: Community , Aggr
None-Transitive: MED, Origin-ID , Cluster list
BGP State:
Idle
Connected
Active
Opensent
Openconfirm
Establish
BGP Features
path Selection
add-paths
fast reroute
BGP advert rules

iBGP to iBGP : OK NOK Split Horizon ( uless Route Reflection)

eBGP to iBGP, eBGP to eBGP and iBGP to eBGP: OK

AS manipulation

remove private AS:  remove-private

company buy another one,

old company change AS : local-as 1

old company change AS but not advertised : local-as 1 private





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