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Knowledge Base

VRNI : Manual IPFIX Configuration (57894)

Last Updated: 2/27/2024Categories: How toTotal Views: 7030Language:
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Symptoms

How to manually enable IPFIX for vRNI monitored VCenter

Resolution

Configure the NetFlow Settings of a vSphere Distributed Switch:
https://docs.vmware.com/en/VMware-vSphere/6.0/com.vmware.vsphere.networking.doc/GUID-55FCEC92-74B9-4E5F-ACC0-4EA1C36F397A.html

Enable or Disable NetFlow Monitoring on a Distributed Port Group or Distributed Port:
https://docs.vmware.com/en/VMware-vSphere/6.0/com.vmware.vsphere.networking.doc/GUID-3CF9AEEB-08B0-47F5-A3B6-ADD8A919DFA0.html

It is also possible to view if IPFIX is enabled/disabled using ESX host command prompt. Following example command and output shows same for a specific distributed port:

1.  Run "net-dvs -l" command to output all DVS properties.

2.  For interested port, check whether "com.vmware.etherswitch.port.ipfix = enabled" is configured for it. E.g:
157        port 2563:
158        com.vmware.common.port.alias =  ,       propType = CONFIG
159        com.vmware.common.port.connectid = 1948479644 ,propType = CONFIG
160        com.vmware.common.port.portgroupid = dvportgroup-110302 ,       propType = CONFIG
161        com.vmware.common.port.block = false ,  propType = CONFIG
162        com.vmware.common.port.dvfilter = filters (num = 0):
163         propType = CONFIG
164        com.vmware.common.port.ptAllowed = 0x 0. 0. 0. 0
165         propType = CONFIG
166        com.vmware.etherswitch.port.security = deny promiscuous; deny mac change; deny forged frames
167         propType = CONFIG
168        com.vmware.etherswitch.port.txUplink = normal ,propType = CONFIG
169        com.vmware.common.port.volatile.persist = /vmfs/volumes/551afd5e-9e5c2567-db30-38eaa714e890/.dvsData/e9 66 3e 50 4e 20 e3 2f-aa  d7 5f 76 ba e1 42 1c/2563 ,     propType = CONFIG
170        com.vmware.etherswitch.port.ipfix = enabled ,   propType = CONFIG    ç IPFIX enabled.

Recommendations:

1. Enable IPFIX on all the DVPGs and UPLINK port of ESX hosts, where workload VMs are present. This is what is needed to get the flow visibility.

2. Do not enable IPFIX on ESX Hosts, where NSX-Edges are present.
(i) This traffic is not needed to get the visibility on the work load vms, and
(ii) NSX Edges can be choke points resulting in high packet rate on these vms.

Common questions:

Q. What is the purpose of enabling it on UPLINK port?

A. VDS reports flows only on egress interface. Hence, all flows to/from physical or internet ip addresses need flow collected from uplink ports in order to get complete information from both directions of traffic on each flow. Please refer to following KB for more details: https://kb.vmware.com/s/article/2146326

Q. What is the impact on ESX/Networking of enabling IPFIX on UPLINK ports?

A. We have been running IPFix at multiple customers without any issues. We have observed that until very high packet rates the performance impact on ESX is ~5%. The impact can depend on a lot of variables like number of sessions, rate of new session, length of sessions.

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