BGP uses the cease subcode in notification message to convey the reason for terminating the session. The cease subcodes currently supported are given in Supported Cease Subcodes.
| Subcode | Description | Supported? |
|---|---|---|
| 1 | Maximum Number of Prefixes Reached | Yes |
| 2 | Administrative Shutdown | Yes |
| 3 | Peer De-configured | Yes |
| 4 | Administrative Reset | No |
| 5 | Connection Rejected | Yes |
| 6 | Other Configuration Change | No |
| 7 | Connection Collision Resolution | Yes |
| 8 | Out of Resources | No |