[c-nsp] BGP error with optional attribute

thiyagarajan b bn.thiyagarajan at gmail.com
Fri Dec 19 10:29:51 EST 2014

Hi everyone,

I have a problem in iBGP between Cisco 7301 and juniper mx series router
where the BGP got flapped throwing the following error in cisco end:

%BGP-3-NOTIFICATION: received from neighbor 3/9 (unsupported
option specified) 0 bytes
%BGP-5-ADJCHANGE: neighbor Down BGP Notification received

%BGP-3-NOTIFICATION: received from neighbor 6/5 (cease) 0 bytes

and found the following log in juniper

rpd[1296]: bgp_read_v4_update:9690: NOTIFICATION sent to
(Internal AS 9583): code 3 (Update Message Error) subcode 9 (error with
optional attribute), Reason: peer (Internal AS 9583) UPDATE -
NLRI inet6-unicast not negotiated
rpd[1296]: Received BAD update from (Internal AS 9583), family
inet6-unicast(16), prefix 2a02:2158::/32

So is this problem caused by the prefix 2a02:2158::/32 because of it
invalid attribute? or is it because of any mismatch SAFI update between the

Please suggest.

Warm Regards,
Thiyagarajan B.

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