1.5-BGP Communication

Question 1

What are BGP neighbors called?

Answer 1

BGP neighbors are called peers.

iBGP Peer.
eBGP Peer.

Question 2

What are the six states of BGP neighbor relationship?

Answer 2

BGP neighbor relationships pass through six states:

• Idle: Peer is not responding.
• Active: Peer is attempting to connect.
• Connect: TCP session established.
• OpenSent: Open message sent.
• OpenConfirm: Response received.
• Established: Peer relationship established.

Question 3

What are the four BGP Packet Types?

Answer 3

There are four BGP message types used for communication: OPEN, KEEPALIVE, UPDATE, and NOTIFICATION messages.

1. OPEN messages are used to open a BGP communication session between peers.
2. KEEPALIVE messages are used to ensure that BGP neighbors are still alive.
3. UPDATE messages are used to advertise, update, or withdraw routes.
4. NOTIFICATION messages are used to indicate an error condition to a BGP neighbor.