Zabbix can not grab SNMP values of type ASN_OBJECT_ID:

2224:20120123:161155.664 item [1.2.3.4:sysObjectID] became not supported: OID [.1.3.6.1.2.1.1.2.0] value has unknown type [0x06]

Often it is very useful (link templates depending on sysObjectID's value, for instance),...