so, what truly does it mean in a lot of our documentation slides (networkers, courseware, etc.) that describe the functionality of the asics and cpu on an asr9k line card. specifically, in the 'box' containing cpu tasks, functionality it lists 'Inline NetFlow" with no supporting information.
does this mean we perform netflow at line rate, via the cpu? that makes my head hurt. netflow is 'process switched' at line rate?
i've found some interesting items so far...
"NetFlow consumes hardware resources (ternary content-addressable memory [TCAM], CPU, etc.), so understanding the resource utilization on a device is important before enabling NetFlow." from the cisco wiki but this was in reference to comparing netflow in nx v ios
"Distributed inline Netflowà1M entries/LC , 100Kpps /LC, flexible sampling and IPv4/IPv6/MPLS feature" in a networkers preso
"In this paper, we propose an online statistical traffic classifier using the C4.5 machine learning algorithm running on the NetFPGA platform. Our NetFPGA classifier is constructed by adding three main modules to the NetFPGA reference switch design; a Netflow module, a feature extractor module, and a C4.5 search tree classifier. The proposed classifier is able to classify the input traffics at the maximum line speed of the NetFPGA platform, i.e. 8 Gbps without any packet loss. Our method is based on the statistical features of the first few packets of a flow. The flow is classified just a few micro seconds after receiving the desired number of packets." from a scientific paper proposal.
can anyone clarify or distill this into 1 simple answer?
For Trident HW this is 100 kpps per LC, for Typhoon it is 200 kpps per LC. So you need to divide this rate by the number of NPs you use on the LC, e.g. on a MOD160 you have 4 NPUs, so you can do 50 kpps per NPU. As these numbers are quite low it is highly recommended to use sampling for netflow on the ASR9K.
This document is an early notification of a behaviour change that will be introduced in IOS XR release 6.5.
IOS XR configuration principles relevant for this article are:
On router platforms all interfaces must be by defaul...
With XR 4.2.0 the ASR9000 is releasing a new line of hardware models. This amongst others is the RSP440, the next generation RSP with faster switch fabric along with Typhoon based Linecards, the next generation network processor.
The Cisco EPN system incorporates a network architecture designed to consolidate multiples services on a single Multiprotocol Label Switching (MPLS) transport network. This network is designed primarily based on Application ...