Administrator Guide

Layer 3 Routing Commands 1372
If the router receives an UPDATE message with an invalid path attribute, the
router will in most cases send a NOTIFICATION message and reset the
adjacency. BGP maintains a per-neighbor counter for each type of path
attribute error. This show command lists each non-zero counter, just after the
LastSubError. The counters that may be listed are as follows:
Counters Description
Path with duplicate
attribute
The peer sent an UPDATE message containing the
same path attribute more than once.
Path with well-
known/optional conflict
A received path attribute was flagged as both well-
known and optional or neither well-known nor optional.
Transitive flag not set on
transitive attr
A received path attribute is known to be transitive, but
the transitive flag is not set.
Mandatory attribute non-
transitive or partial
A mandatory path attribute was received with either the
transitive or partial flag set.
Optional attribute non-
transitive and partial
An optional path attribute has the transitive flag clear
and the partial flag set.
Path attribute too long A received path attribute was longer than the expected
length.
Path attribute length error A received path attribute has a length value that exceeds
the remaining length of the path attributes field.
Invalid ORIGIN code A received UPDATE message included an invalid
ORIGIN code.
Unexpected first ASN in
AS path
The AS Path attribute from an external peer did not
include the peer’s AS number as the first AS.
Invalid AS path segment
type
The AS Path includes a segment with an invalid
segment type.
Invalid BGP NEXT HOP The BGP NEXT HOP is not a valid unicast address.
Bad BGP NEXT HOP The BGP NEXT HOP was either the receiver’s IP
address or an IP address outside the subnet to the peer.
Invalid AGGREGATOR
attribute
The AGGREGATOR attribute was invalid.
Unrecognized well-known
path attribute
An UPDATE message contained a path attribute with
the Optional flag clear, but this router does not
recognize the attribute.
2CSNXXX_SWUM204.book Page 1372 Monday, January 25, 2016 1:25 PM