Prerequisites
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The EVPN Multi-Site feature requires Cisco Nexus 9000 Series NX-OS Release 7.0(3)I7(1) or later.
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Familiarity with VXLAN BGP EVPN data center fabric architecture and configuration through DCNM.
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Familiarity with MSD fabrics, if you are connecting member fabrics of an MSD.
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Fully configured VXLAN BGP EVPN fabrics that are ready to be connected using the EVPN Multi-Site feature, external fabric(s) configuration through DCNM, and relevant external fabric devices' configuration (for example, route servers).
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VXLAN BGP EVPN fabrics (and their interconnection) can be configured manually or using DCNM. This document explains the process to connect the fabrics through DCNM. So, you should know how to configure and deploy a VXLAN BGP EVPN fabric, and how to create an external fabric through DCNM. For more details, see the VXLAN BGP EVPN Fabrics Provisioning section in the Control chapter.
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When you enable the EVPN Multi-Site feature on a BGW, ensure that there are no prior overlay deployments on it. Remove existing overlay profiles and then start provisioning Multi-Site extensions through DCNM.
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Ensure that the role of the designated BGWs is Border Gateway. To verify, right-click the BGW and click Set role. You can see that (current) is added to the current role of the switch.
If the current role is not Border Gateway, you should remove the device from the fabric and discover it again through DNCM using the POAP bootstrap option and re-provision the configurations for the device.
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To ensure consistency across fabrics, ensure the following:
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These checks are done for member fabrics of an MSD when the fabrics are moved under the MSD fabric.
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The underlay IP addresses across the fabrics, the loopback 0 address and the loopback 1 address subnets should be unique.
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Each fabric should have a unique site ID and BGP AS number associated and configured.
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All fabrics should have the same Anycast Gateway MAC address.
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While the MSD provisions a global range of network and VRF values, some parameters are fabric-specific and some are switch-specific. You should specify fabric instance values for each fabric (for example, multicast group subnet address) and switch instance values for each switch (for example, VLAN ID).
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After completing the EVPN Multi-Site specific prerequisites, start EVPN Multi-Site configuration on BGW_3 with extensions to the route server RS_1.