Posted on February 19, 2021 2:58 pm
 |  Asked by Jason Van Patten
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Hey folks –


I’m playing around with the latest cEOS image 4.25.2F-20711308.4252F (engineering build) and its handling of VRFs within EVPN seems broken.  Specifically around the importing and exporting of RTs.  As an example, let’s say I have three VRFs:

  • VRF A
  • VRF B
  • VRF C

Within BGP I have:

  • VRF A importing [A, B, C], and exporting A.
  • VRF B importing [A, B], and exporting B.
  • VRF C importing [A, C], and exporting C.

Basically, A is importing all VRFs so he can talk to them via the VXLAN data plane.  Each of the other VRFs is importing ONLY A (and themselves) so that they can talk back to A.  Normally and inherit to EVPN: VRF A should not become a transit VRF.  In my example, B should not be able to see C’s routes and vice versa.  It’s only if the imported-route bit is added to the end of the route-target export line, that a given VRF should re-advertise its imported EVPN routes to other VRFs.  But, I don’t have that configured.

As it stands, in cEOS B and C can see each others’ routes via A.  That makes using cEOS to model out EVPN stuff a bit difficult to use.  Can the developers please get a handle on this and get it figured out?  I know the VRF stuff within cEOS has been a bit sketchy over the past few releases.  It looks like it still needs some work. :-)


Answered on February 21, 2021 9:42 am

Hi Jason,

Thanks for reaching out.

Could you please provide us the below logs to further investigate and replicate this issue in-house wrt the configs from your cEOS lab:

show tech-support | no-more

show tech-support extended evpn | no-more




Posted by Jason Van Patten
Answered on February 21, 2021 4:44 pm

Hi Bhavana -

Let's hold off on the 'show' commands for the time being.  This may be due to some other routing I'm doing on the leaf nodes, and I hadn't realized it was causing the issue.  With any luck I can come back and close this question as "self-answered".  More details to follow.

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