网络工程 - 思科 C3750 和 PRTG 网络流量 - 吾爱随笔录

我有一个我们网络的核心交换机（骨干网），它将所有 vlan 广播到其他交换机。我正在尝试在交换机上配置 netflow 并将其链接到 PRTG 上的 Netflow 传感器。

我遵循了这个实现：https ://www.nazaudy.com/index.php/12-technology/cisco/34-enable-netflow-v9-in-cisco-switches-with-prtg

出于某种原因，当我确实显示流量导出统计信息时，显示“0”，好像没有任何内容被导出！

这是我的堆叠核心交换机类型：C3750X，IOS 版本 15.2(4)E5，许可级别：ipservices，sdm：“桌面路由”

这是我用来在交换机上获取 netflow 的配置，（我尝试使用 v9 但同样的问题，下面是 v5）：

flow record PRTG-FLOW-RECORD
 description Record-Network-Traffic
 match ipv4 tos
 match ipv4 protocol
 match ipv4 source address
 match ipv4 destination address
 match transport source-port
 match transport destination-port
 collect timestamp sys-uptime first
 collect timestamp sys-uptime last

!
!
flow exporter PRTG-EXPORTERv5
 description Export-Flow-to-PRTG
 destination 10.7.7.200
 source Vlan7
 transport udp 9997
 export-protocol netflow-v5
!
!
flow monitor PRTG-MONITOR
 description Monitor-PRTG-Flow
 exporter PRTG-EXPORTERv5
 cache timeout active 60
 record PRTG-FLOW-RECORD
!
!
sampler PRTG-SAMPLER
 mode random 1 out-of 32

当我确实显示出口商统计信息时：

Flow Exporter PRTG-EXPORTERv5:
  Packet send statistics (last cleared 05:45:07 ago):
    Successfully sent:         0                     (0 bytes)

  Client send statistics:
    Client: Flow Monitor PRTG-MONITOR
      Records added:           0
      Bytes added:             0

当我确实显示流量导出器时：

Flow Exporter PRTG-EXPORTERv5:
  Description:              Export-Flow-to-PRTG
  Export protocol:          NetFlow Version 5
  Transport Configuration:
    Destination IP address: 10.7.7.200
    Source IP address:      10.7.7.1
    Source Interface:       Vlan7
    Transport Protocol:     UDP
    Destination Port:       9997
    Source Port:            49747
    DSCP:                   0x0
    TTL:                    255
    Output Features:        Not Used

当我确实显示流量监视器时：

Flow Monitor PRTG-MONITOR:
  Description:       Monitor-PRTG-Flow
  Flow Record:       PRTG-FLOW-RECORD
  Flow Exporter:     PRTG-EXPORTERv5
  Cache:
    Type:                 normal
    Status:               allocated
    Size:                 128 entries / 6660 bytes
  Cache:
    Type:                 normal (Platform cache)
    Status:               allocated
    Size:                 Unknown
  Timers:
                       Local        Global
    Inactive Timeout:     15 secs
    Active Timeout:       60 secs      1800 secs
    Update Timeout:       1800 secs
    Synchronized Timeout: 600 secs

我在接口 VLAN 下应用这两个命令：

ip flow monitor PRTG-MONITOR sampler PRTG-SAMPLER input
ip flow monitor PRTG-MONITOR sampler PRTG-SAMPLER output

出于某种原因，如果我在千兆接口下应用它，我会感到困惑：

Error: Flexible Net Flow is not supported on this interface

我的9997端口下的PRTG服务器是打开的，我确定了！它只是没有收到任何 netflow 数据

我将不胜感激在这个级别的任何帮助！