With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cbgpPeer2LastError
CISCO BGP4 Peer2 Last Error
1.3.6.1.4.1.9.9.187.1.2.5.1.17
The last error code and subcode seen by this peer on this connection. If no error has occurred, this field is zero. Otherwise, the first byte of this two byte OCTET STRING contains the error code, and the second byte contains the subcode.
Back to CISCO-BGP4-MIB MIB page.
IPHost Network monitor allows you to monitor cbgpPeer2LastError on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.