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ROOT ‹ Network Security & Routing & Switching ‹ Routing and dynamic routing protocols ‹ BGP Notification Message (3), length: 21, OPEN Message Error (2), subcode Authentication Failure

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BGP Notification Message (3), length: 21, OPEN Message Error (2), subcode Authentication Failure

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Post subject: BGP Notification Message (3), length: 21, OPEN Message Error (2), subcode Authentication Failure | Posted: Fri Nov 03, 2017 8:24 am

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BGP Notification Message (3), length: 21, OPEN Message Error (2), subcode Authentication Failure

When Junos is configured for an external BGP session with a neighbor not directly connected, without the "multihop ttl 2" configuration statement, it will fail to accept the neighbor with a notification message following the open message:

Code:

   Notification Message (3), length: 21, OPEN Message Error (2), subcode Authentication Failure (5)

There is no fix, but correct configuration: if ebgp neighbor is not directly connected, it's mandatory to:

Code:

# set protocols bgp group <GROUP> multihop ttl 2

Under group or under neighbor.

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Topics		Author	Replies	Views	Last post
Topics related to - "BGP Notification Message (3), length: 21, OPEN Message Error (2), subcode Authentication Failure"
	Junos: BGP label allocation failure: Need a nexthop address on LAN	mandrei99	1	3357	Mon Nov 10, 2014 4:28 am mandrei99
	Example of BGP update message sent from Junos for a VPLS circuit	mandrei99	0	2495	Fri Jul 19, 2013 9:24 am mandrei99
	Example of BGP update message sent from Junos device when export policy is modified	mandrei99	0	2238	Fri Jul 19, 2013 9:09 am mandrei99
	Junos: error: VRF: vrf-import needs at least one target community or a reject policy for vrf in	mandrei99	0	3514	Wed Jul 03, 2013 8:39 am mandrei99

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