SNMP Monitoring BGP sessions status

1.3.6.1.2.1.15.3.1.2.ip.ip.ip.ip - Managed objects for BGP v4
Just replace IP with the ip of the bgp neighbor

Superior references

1.3.6.1.2.1.15 - BGPv4
1.3.6.1.2.1 - SNMP MIB-2
1.3.6.1.2 - IETF Management
1.3.6.1 - OID assignments from 1.3.6.1 - Internet
1.3.6 - US Department of Defense
1.3 - ISO Identified Organization
1 - ISO assigned OIDs

Possible SNMP Output

1 = IDLE
2 = CONNECT
3 = ACTIVE
4 = OPENSENT
5 = OPENCONFIRM
6 = ESTABLISHED

Trigger Example for zabbix:
{host2:1.3.6.1.2.1.15.3.1.2.ip.ip.ip.ip.last(0)}#6

http://tools.cisco.com/Support/SNMP/do/BrowseOID.do?local=en&translate=Translate&objectInput=1.3.6.1.2.1.15.3.1.2