1: Message header error
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2: Open message error
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1: unsupported version number
2: error peer AS
3: error BGP identifier
4: unsupported optional parameter
5: authentication failed
6: unacceptable hold-time
7: unsupported capability
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3: Update message error
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1: malformed attribute list
2: unrecognized well-known attribute
3: well-known attribute is missing
4: attribute flags error
5: attribute length error
6: invalid origin attribute
7: AS routing loop
8: invalid Next-Hop attribute
9: error optional attribute
10: invalid network field
11: abnormal AS-Path
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4: Hold timer expired
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0: no special definition of the error subcode
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5: Finite state machine error
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0: no special definition of the error subcode
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6: Cease
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1: maximum number of prefixes reached
2: administrative shutdown
3: peer deleted
4: administrative reset
5: connection rejected
6: other configuration change
7: connection collision resolution
8: out of resources
9: BFD session Down
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