BGP Session Establishment
Step-by-step process of establishing a BGP session between two routers
Idle
Connect
Active
OpenSent
OpenConfirm
Established
🔷
Router A
AS 65001
Idle
TCP SYN
→ port 179
TCP SYN-ACK
TCP ACK
3-way handshake ✓
OPEN
AS=65001, hold=180
OPEN
AS=65002, hold=180
KEEPALIVE
OPEN accepted ✓
KEEPALIVE
OPEN accepted ✓
UPDATE
NLRI + attributes
UPDATE
NLRI + attributes
🔶
Router B
AS 65002
Idle
Start
Click
Next step
to walk through the BGP session establishment process step by step.
▶ Next step
↺ Restart
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