NOTIFICATION messages are used to signal when something is wrong with the BGP session. A NOTIFICATION will be sent when any of the following occurs:
- An unsupported option is sent in an OPEN message.
- A peer fails to send an update or keepalive
When an error is detected, the BGP session is closed.
Notification Message Format
| Error code |
Error Subcode | data | |
| data | |||
Notification Error Codes
| ERROR CODE | ERROR SUBCODE | |
| 1 | Message Header Error |
1
- Connection Not Syncrhonized 2 - Bad Message Length 3 - Bad Message Type |
| 2 | OPEN message error |
1
- Unsupported Version 2 - Bad Peer AS 3 - Bad BGP Identifier 4 - Unsupported Optional Parameter 5 - Authentication Failure 6 - Unacceptable Hold Time |
| 3 | UPDATE Message Error |
1
- Malformed Attribute List 2 - Unrecognized well-known attribute 3 - Missing Well-Known Attribute 4 - Attribute Flags Error 5 - Attribute Length Error 6 - Invalid Origin Attribute 7 - AS routing loop 8 - Invalid NEXT_HOP attribute 9 - Optional Attribute Error 10 - Invalid Network Field |
| 4 | Hold Timer Expired |
No Subcodes |
| 5 | Finite State Error |
No Subcodes |
| 6 | Cease | No Subcodes |
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