What is "Source ID" in the header of the Netflow V9 package
Deepak,
Consider these quotes from the same RFC 3954:
Section 2: terminology:
Observation Point An Observation Point is a location in the network where IP packets can be observed; for example, one or a set of interfaces on a network device like a router. Every Observation Point is associated with an Observation Domain. Observation Domain The set of Observation Points that is the largest aggregatable set of flow information at the network device with NetFlow services enabled is termed an Observation Domain. For example, a router line card composed of several interfaces with each interface being an Observation Point.
Article 7: Management of the models:
A NetFlow Collector that receives Export Packets from several Observation Domains from the same Exporter MUST be aware that the uniqueness of the Template ID is not guaranteed across Observation Domains.
Article 9: The collector side:
At any given time the Collector SHOULD maintain the following for all the current Template Records and Options Template Records: Exporter, Observation Domain, Template ID, Template Definition, Last Received. Note that the Observation Domain is identified by the Source ID field from the Export Packet.
So in other words, the Source ID is an identifier of the field of Observation (and in fact, the IPFIX RFCS calls this header directly as Observation domain ID field). Model IDS are unique by the exporter and field of Observation, and if only one exporter uses several models in its different areas of Observation, the IDS of these models may overlap even in only one exporter. Observation domain ID (i.e. Source IDs) identify only the internal structure of a single exporter, and no provision is made to preserve their specificity through several exporters - for this, the IP source should be used.
With respect to whether there can be multiple instances of NetFlow on a single router, I get a feeling that with the decentralized platforms and distributed, multiple linecards in only one router can run their own NetFlow analysis for data passing through them, that each provide a selective collection of NetFlow. Thus, map of each line or each sheet features its own NetFlow analysis should be assigned its own unique Observation domain ID.
If this is not configurable by the system user should automatically make the value based on the motor and line card router. But what I observed, with several routers, is that this value is always 0 (zero).
I think that it is dependent on the construction of material of the router. As an example remotely related, old routers 2600 series had two WIC slots. If you have inserted two modules of WIC - 2T in these slots, you would expect that they would be numbered Serial0/0 and Serial0/1, Serial1/0, Serial1/1. Very surprisingly, however, these routers reviewed the two slots to be connected internally to one bus, and interfaces have been appointed Serial0/0 and Serial0/1, Serial0/2 Serial0/3 - as if they were installed in a single '0' location. Something similar can happen to the areas of Observation and their identity papers. You would think that every single line card was a separate field of Observation. However, the reality can be different, and the entire router can act as a single domain of Observation to the outside world. It's just the way it is built - and programmed.
It is unclear why Cisco doc says to use the "Source ID" and '"Source IP address' to correctly distinguish the flow.
I think it's a bad wording in the RFC. I think what they mean is that if you use the duplet
Tags: Cisco Network
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