Table 143: BGP Notification Message Error Subcodes
Error
Type
|
Error
Subcode Value
|
Subcode
Name
|
Description
|
Message
Header Error (Error Code 1)
|
1
|
Connection Not
Synchronized
|
The expected value in the Marker
field was not found, indicating that the connection has become unsynchronized.
See
the description of the Marker field.
|
2
|
Bad
Message Length
|
The message
was less than 19 bytes, greater than 4096 bytes, or not consistent with
what was expected for the message type.
|
3
|
Bad Message
Type
|
The Type field of the
message contains an invalid value.
|
Open
Message Error (Error Code 2)
|
1
|
Unsupported
Version Number
|
The device
does not speak the version number its peer is trying to
use.
|
2
|
Bad Peer AS
|
The router doesn't recognize
the peer's autonomous system number or is not willing to communicate
with it.
|
3
|
Bad
BGP Identifier
|
The BGP Identifier
field is invalid.
|
4
|
Unsupported
Optional Parameter
|
The Open message contains
an optional parameter that the recipient of the message doesn't understand.
|
5
|
Authentication
Failure
|
The data in
the Authentication Information optional parameter could not be
authenticated.
|
6
|
Unacceptable
Hold Time
|
The router refuses to open a
session because the proposed hold time its peer specified in its Open
message is unacceptable.
|
Update
Message Error (Error Code 3)
|
1
|
Malformed
Attribute List
|
The overall
structure of the message's path
attributes is incorrect, or an attribute
has appeared twice.
|
2
|
Unrecognized
Well-Known Attribute
|
One of the mandatory well-known
attributes was not recognized.
|
3
|
Missing
Well-Known Attribute
|
One of the
mandatory well-known attributes was not specified.
|
4
|
Attribute Flags
Error
|
An attribute has a flag set to
a value that conflicts with the attribute's type code.
|
5
|
Attribute
Length Error
|
The length
of an attribute is incorrect.
|
6
|
Invalid Origin
Attribute
|
The Origin attribute has
an undefined value.
|
7
|
AS
Routing Loop
|
A routing loop
was detected.
|
8
|
Invalid Next_Hop
Attribute
|
The Next_Hop attribute
is invalid.
|
9
|
Optional
Attribute Error
|
An error was
detected in an optional attribute.
|
10
|
Invalid Network
Field
|
The Network Layer Reachability
Information field is incorrect.
|
11
|
Malformed
AS_Path
|
The AS_Path
attribute is incorrect.
|