You can add NSX Edge nodes to an NSX Edge Cluster that you created with SDDC Manager.
You might want to add NSX Edge nodes to an NSX Edge cluster, for:
- Rack failure resiliency
- When the Tier-0 Service High Availability is Active-Standby and you require more than two NSX Edge nodes for services.
Note: Only two of the NSX Edge nodes can have uplink interfaces, but you can add more nodes without uplink interfaces.
- When the Tier-0 Service High Availability is Active-Active and you require more than 8 NSX Edge nodes for services.
- When you add Supervisor Clusters to a Workload Management workload domain and need to support additional tier-1 gateways and services.
The available configuration settings for a new NSX Edge node vary based on:
- The Tier-0 Service High Availability setting (Active-Active or Active-Standby) of the NSX Edge cluster.
- The Tier-0 Routing Type setting (static or EBGP) of the NSX Edge cluster.
- Whether the new NSX Edge node is going to be hosted on the same vSphere cluster as the existing NSX Edge nodes (in-cluster) or on a different vSphere cluster (cross-cluster).
Note: Stretched clusters only support in-cluster expansion.
Prerequisites
- Verify that separate VLANs and subnets are available for the NSX host overlay VLAN and NSX Edge overlay VLAN. You cannot use DHCP for the NSX Edge overlay VLAN.
- Verify that the NSX host overlay VLAN and NSX Edge overlay VLAN are routed to each other.
- For dynamic routing, set up two Border Gateway Protocol (BGP) peers on Top of Rack (ToR) switches with an interface IP, BGP autonomous system number (ASN), and BGP password.
- Reserve a BGP ASN to use for the NSX Edge cluster’s Tier-0 gateway.
- Verify that DNS entries for the NSX Edge nodes are populated in the customer-managed DNS server.
- The vSphere cluster hosting the NSX Edge nodes must include hosts with identical management, uplink, NSX Edge overlay TEP, and NSX Edge overlay TEP networks (L2 uniform).
- The vSphere cluster hosting the NSX Edge nodes must have the same pNIC speed for NSX-enabled VDS uplinks chosen for Edge overlay.
- All NSX Edge nodes in an NSX Edge cluster must use the same set of NSX-enabled VDS uplinks. These uplinks must be prepared for overlay use.
- The NSX Edge cluster must be Active.
- The NSX Edge cluster must be hosted on one or more vSphere clusters from the same workload domain.