6. Error Handling

6. Error Handling

If a BGP speaker receives from a neighbor an Update message that contains the MP_REACH_NLRI or MP_UNREACH_NLRI attribute, and the speaker determines that the attribute is incorrect, the speaker MUST delete all the BGP routes received from that neighbor whose AFI/SAFI is the same as the one carried in the incorrect MP_REACH_NLRI or MP_UNREACH_NLRI attribute. For the duration of the BGP session over which the Update message was received, the speaker then SHOULD ignore all the subsequent routes with that AFI/SAFI received over that session.

In addition, the speaker MAY terminate the BGP session over which the Update message was received. The session SHOULD be terminated with the Notification message code/subcode indicating "Update Message Error"/"Optional Attribute Error".