Arista vEOS - sFlow

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Suraj Gour

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Aug 22, 2018, 12:37:12 PM8/22/18
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Hello Everyone,

I am trying to view flows traversing Arista vEOS, and have configured agent using link "https://blog.sflow.com/2017/03/arista-eos-telemetry.html".

The problem is - I cannot see any flows and also there are no Keys under Key Tab.

Can someone help.

Details -

Output of "Show sflow" command :-

sFlow Configuration
-------------------
Destination(s):
  192.168.56.200:6343 ( VRF: default )
Source(s):
  10.0.0.10 from Ethernet2 ( VRF: default )
  :: ( default ) from Ethernet2 ( VRF: default )
Sample Rate: 100
Polling Interval (sec): 30.0
Rewrite DSCP value: No
Status
------
Running: Yes
Polling On: Yes ( default )
Sampling On: Yes ( default )
Send Datagrams:
  Yes ( VRF: default )
BGP Export:
  No ( VRF: default )
Hardware Sample Rate: 1048576 ( default )
Statistics
----------
Total Packets: 904444
Number of Samples: 0
Sample Pool: 0
Hardware Trigger: 0
Number of Datagrams: 53711


Thanks,
Suraj

Neil McKee

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Aug 22, 2018, 12:43:31 PM8/22/18
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Suraj,

It looks like the traffic level is low and you need to set the 1:N packet sampling rate.  Something like:

config> sflow rate 512

Then you will see that "Number of Samples" count start to increment.

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Neil McKee
InMon Corp.
http://www.inmon.com

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Suraj Gour

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Aug 22, 2018, 1:18:41 PM8/22/18
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Thanks Neil. I tried this rate (and tried other values as well) but no luck. 

Regards,
Suraj

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Neil McKee

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Aug 22, 2018, 1:59:27 PM8/22/18
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Does the Hardware Sample Rate still say 1048576?  On Arista you have to add the "dangerous" keyword when you set the sampling rate to anything less than 16K.

You could also generate more traffic (e.g. with "iperf" or "sudo ping -f")

Neil

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Neil McKee
InMon Corp.
http://www.inmon.com

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Suraj Gour

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Aug 23, 2018, 12:55:41 PM8/23/18
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Yes, the  Hardware Sample Rate still say 1048576 and tried adding "dangerous" keyword, did not work.

-Suraj

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Peter Phaal

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Aug 23, 2018, 4:35:55 PM8/23/18
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I believe that EOS only supports packet sampling on physical switches, i.e. the vEOS virtual machine you are using does not currently support packet sampling.
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Suraj Gour

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Aug 23, 2018, 11:47:54 PM8/23/18
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Thanks Peter. Will proceed accordingly now.

-Suraj


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