Data Center

I have a scenario where I have 2, but could end up being 3 leaves(leaf switches) that will belong to the same ESI.  I want to be able to control which of one of these 2(or3) leaves will be the elected DF(designated forwarder).  I know on the MXs, there is a knob that allows for changing the DF election algorithm from mod-based to being preference based that I've tested  and it works, but on the QFX's this knob does not exist.  How can I influence the DF election process on the QFXs?  I've read over the RFCs on this as well as the EVPN Guide which can be found here:

https://www.juniper.net/documentation/en_US/junos/topics/concept/evpn-bgp-multihoming-overview.html#jd0e1017

Thanks in advance to any insight provided!!

Hi Steve,
You're right, preference-based DF election is not supported on QFX as of today, so DF election follows the algorithm described in RFC7432.
Best Regards
Ridha

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Ridha Hamidi
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Original Message:
Sent: 02-27-2021 21:58
From: Unknown User
Subject: Influence DF Election for ESI on QFXs

I have a scenario where I have 2, but could end up being 3 leaves(leaf switches) that will belong to the same ESI.  I want to be able to control which of one of these 2(or3) leaves will be the elected DF(designated forwarder).  I know on the MXs, there is a knob that allows for changing the DF election algorithm from mod-based to being preference based that I've tested  and it works, but on the QFX's this knob does not exist.  How can I influence the DF election process on the QFXs?  I've read over the RFCs on this as well as the EVPN Guide which can be found here:

https://www.juniper.net/documentation/en_US/junos/topics/concept/evpn-bgp-multihoming-overview.html#jd0e1017

Thanks in advance to any insight provided!!