Скачать или смотреть BGP- PART_2

This Video brief about BGP.
BGP uses four types of messages for its operations:
○ OPEN : Used in Neighbour Establishment.
□ CODE TYPE =1
○ UPDATE : Informs neighbor about with drawn routes, changed routes and new routes.
□ CODE TYPE =2
○ KEEPLIVE : Examine the BGP Table.
□ CODE TYPE = 4

○ NOTIFICATION : used to signal a BGP error, typically results in reset to the neighbor
□ CODE TYPE= 3



STATES IN BGP : 6 STATES
○ IDLE: BGP wait for a start event , such as a new bgp neighbor being configured or an established bgp peering being reset.
○ CONNECT: BGP tries to complete the three way handshake
○ ACTIVE: BGP attempts a new TCP connection.
○ OPENSENT: BGP Sends an Open message and waits for one in return.
○ OPENCONFIRM:BGP listens for keepalive messages from its peer.
○ ESTABLISHED:BGP neighbor adjacency has been created.