Decoding BGP Notification Error
Following Log messages are normal in the IX scenario but decode the error message is quite interesting: We will see why this error message popped up : : %BGP-3-NOTIFICATION: sent to neighbor 10.10.194.236 2/7 (unsupported/disjoint capability) 0 bytes FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF 0039 0104 xx0D 00B4 C06A 1102 1C02 0601 0400 0200 0102 0280 0002 0202 0002 0246 0002 0641 0400 00C4 0D its a raw hex out of the BGP open message and starts from the marker 16byte FF so the actual output starts from 0039 2 byte length value : 00 39 - 57 1 byte Type : 01 open message 1 byte Version : 04 2 byte ASN : xx0D [ modified to remove the relevant information ] 2 byte holdtime : 00 B4 - 180 Seconds 4 byte BGP identifier : C06A 1102 [ modified ] 1 byte Optional parameter length : 1C - 28 bytes Refer RFC: http://tools.ietf.org/html/rfc5492 http://tools.ietf.org/html/draft-ietf-idr-ext-opt-param-02 http://www.iana.org/assignments/capability-codes/capability-c