MLAG, PFC in a stretch scenario

Infrastructure & Networking Switches and Gateways Ethernet Switches
1

We are a little bit confuse about MLAG, PFC and RDMA (RoCe) on a stretch.

We have 4 x SN2010-Spectrum-Switches which we want to connect redundantly with our two Hyper-V-Cluster in a stretch-modus with ConnectX-4 -Cards each Server.

2 switches of each site should run in a HA Modus, therefore we need MLAG of each pair.

As Mellanox-Docs like https://community.mellanox.com/s/article/how-to-configure-mlag-on-mellanox-switches we have to enable PFC globally. OK

For Hyper-V with RDMA and switch-embedded-teaming under Windows 2016 we need PFC too, but as MLX-Docs https://community.mellanox.com/s/article/how-to-enable-pfc-on-mellanox-switches--spectrum-x with priority (e.g.) 4 desired on two ports over the switch-pair.

Now, do we have to configure the priority of each MLAG-Switch-Pair for PFC via IPL?

How we have to configure PFC-Priority in the trunk ( in our below scenario) between the two MLAGs-Domain ?

Thanks for your help in advance

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2

Hi Andreas,

The post How to Enable PFC on Mellanox Switches (Spectrum) https://community.mellanox.com/s/article/how-to-enable-pfc-on-mellanox-switches--spectrum-x is outdated.

Please refer to the Recommended Network Configuration Examples for RoCE Deployment https://community.mellanox.com/s/article/recommended-network-configuration-examples-for-roce-deployment article.

The configuration in the above article will enable the correct lossless priority pfc on all ports.