[j-nsp] Error BGP RECV Notification code 2 (Open Message Error) subcode 7 (unsupported capability)

[khagendra dhakal]

Hi Chuck,

I  applied the command (hidden/ undocumented) and it worked.

 M10i already has many peers that support *2 byte asn only* and is running
without any issues, but *why it is not able to negotiate with Maipu to make
the peer up without disabling the 4byte asn capability*.

ASFAIK, 4 byte ASN or AS4_PATH is an optional transitive attribute unlike
AS_PATH mandatory attribute. My asmuntion is BGP new_speaker may send
AS4_PATH to its neighbor an OPEN message with capability check, if fail it
should have to use AS_PATH or 2 byte to negotiate to its OLD-BGP speakers
and  make the peer up.

*The question is why JunOs failed with Maipu ?
*
Thank you,
Khagendra Dhakal



On Thu, May 20, 2010 at 9:31 PM, Chuck Anderson <cra at wpi.edu> wrote:
> set neighbor w.x.y.z disable-4byte-as
>
> On Thu, May 20, 2010 at 09:03:55PM +0545, khagendra dhakal wrote:
>> Dear all,
>>
>> Platform: M10i
>> JUNOS: JUNOS 9.2R2.15
>>
>> Platform: Maipu 2800
>> IOS: rp8-i-6.1.37(xnwt-11).bin), version 6.1.37
>>
>>
>> PROBLEM: Has anyone had any bad experience on bgp peering between the
>> above mentioned Devices with the  following error: ?
>>
>> Error:
>> BGP RECV xxx.xxx.xxx.xxx+3407 -> xxx.xxx.xxx.xxx+179
>>  BGP RECV message type 3 (Notification) length 27
>>  BGP RECV Notification code 2 (Open Message Error) subcode 7
>> (unsupported capability)
>>  BGP RECV Data (6 bytes): 41 04 00 00 b3 15
>>  bgp_peer_close: closing peer xxx.xxx.xxx.xxx (External AS xxxxx),
>> state is 5 (OpenConfirm)
>>  bgp_close_socket: peer xxx.xxx.xxx.xxx (External AS xxxxx)
>>  ...........................
>> ............................
>>  advertising receiving-speaker only capabilty to neighbor
>> xxx.xxx.xxx.xxx (External AS xxxxx)
>>  bgp_4byte_aspath_add_cap():153 AS4-Peer xxx.xxx.xxx.xxx (External AS
>> xxxxx)(SEND): 4 byte AS capability added, AS xxxxx
>>
>> Please suggest the appropriate solution to get out of this issue.
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