SNMP:响应PDU太大

Question

我需要测试一个基于snmp++ library.When的驱动程序代码--我启动了这个驱动程序代码，输出了以下错误日志

• SNMP陷阱注册错误:SNMP:响应PDU太大

我正在使用SNMP++v3.2.25.I，在网络上找到了一个SNMP模拟器，并将它发送给SNMP driver.Still，打印出错误日志

• "Snmp陷阱注册错误:SNMP:响应PDU太大“。

我使用的SNMP模拟器是SnmpTrapGen V1.1.I在CMD命令中发送的

• SnmpTrapGen.Exe -r:172.20.31.126 -p:161 -v:3 -to: 1.3.6.1.4.1.2011.15.2.4.3.3.0.1

int ScsSnmp::init_snmp()
{
    Snmp::socket_startup();
    int status;
//  UdpAddress address(m_local_addr);
    m_snmp = new Snmp(status/*,address*/);
    if (( m_snmp == NULL) || ( status != SNMP_CLASS_SUCCESS))
    {
        printlog(LOGE_SNMP + m_link,"constructing Snmp Object failed ");
    }
    else
    {
        TargetCollection targets;
        OidCollection trapids;
        Oid trapoid = OidAlarmReportNotificationType;
        Oid heartoid = OidHeartbeatNotificationType;
        trapids += trapoid;
        trapids += heartoid;
        m_snmp->notify_set_listen_port(TRAP_LISTEN_PORT);
        ScsSnmp* myself = this;
        if ( status = m_snmp->notify_register( trapids, targets,my_trap_callback,myself) != SNMP_CLASS_SUCCESS)
        {
            printlog(LOGE_SNMP + m_link,"Snmp Trap Register Error : %s ",m_snmp->error_msg(status));
            return -1;
        }
        m_snmp->start_poll_thread(1000);    //1000ms
    }
    return 0;
}

void ScsSnmp::my_trap_callback (int reason, Snmp *session,Pdu &pdu, SnmpTarget &target, void *data)
{
    ScsSnmp* scssnmp = (ScsSnmp*)data;
    printlog(LOGE_SNMP + scssnmp->m_link,"start my_trap_callback");
    if ( reason == SNMP_CLASS_NOTIFICATION) 
    {
        Vb nextVb;
        GenAddress addr;
        target.get_address(addr);
        IpAddress from(addr);   
        Oid notify_id,ent;
        pdu.get_notify_id(notify_id);
        pdu.get_notify_enterprise(ent);
        if (notify_id == OidAlarmReportNotificationType)
        {
            memset(scssnmp->m_alarm_msg,0,128);
            memset(scssnmp->m_alarm_info.station,0,64);
            memset(scssnmp->m_alarm_info.subsystem,0,64);
            memset(scssnmp->m_alarm_info.devicetype,0,64);
            memset(scssnmp->m_alarm_info.device,0,64);
            memset(scssnmp->m_alarm_info.alarm_msg,0,128);
            for (int i = 0;i<pdu.get_vb_count();i++)
            {
                pdu.get_vb(nextVb, i);
                scssnmp->process_alarm_vb(nextVb);
            }
            memset(scssnmp->m_alarm_buf,0,512);
            memcpy(scssnmp->m_alarm_buf,&scssnmp->m_alarm_head,sizeof(alarm_head));
            memcpy(scssnmp->m_alarm_buf+sizeof(alarm_head),&scssnmp->m_alarm_info,sizeof(alarm_event_info));
            bool ret = scssnmp->m_ctrl_inf->addAlarm(scssnmp->m_alarm_buf,512);
            if (ret)
            {
                printlog(LOGE_SNMP + scssnmp->m_link,"add an event alarm success !");
            }
            else
            {
                printlog(LOGE_SNMP + scssnmp->m_link,"add an event alarm failed !");
            }

        }
        else if (notify_id == OidHeartbeatNotificationType)
        {
            printlog(LOGE_SNMP + scssnmp->m_link,"get a heartbeat !");
        }
        else
        {
            printlog(LOGE_SNMP + scssnmp->m_link,"Trap notify id is wrong,id=%s",notify_id.get_printable());
        }

    }
    else
    {
        printlog(LOGE_SNMP + scssnmp->m_link,"Trap Receive Error = ",session->error_msg(reason));
    }
    printlog(LOGE_SNMP + scssnmp->m_link,"end my_trap_callback");
}

我想通过emulator.The SNMP驱动程序发送SNMP陷阱，然后接收数据并打印out.Simply put，您想要测试数据接口works.But实际接收接口是否一直打印出错误日志。

• "Snmp陷阱注册错误:SNMP:响应PDU太大“。

Answer 1

我们以前遇到过这种情况，但它在snmp get响应中。这总是指示响应pdu大于65535字节。在162端口上进行数据包捕获将给出更明确的验证。当我们在snmp请求中遇到这种情况时，我们减少了每个请求中为解决这个问题而发送的OID数量。