In this step, you specify the topology that will be migrated. This can be done through the NSX Manager UI or by using a mapping file in JSON format.
This mapping specifies how Edge Service Gateways (ESGs) and Distributed Logical Routers (DLRs) should map to gateways in
NSX. Before providing the mapping, evaluate your topology requirements and plan to do the following:
- Determine how you will map the ESGs and DLRs. The northbound ESGs without any L4-L7 services should be skipped. These are usually the ESGs peering with northbound routers and are in ECMP path. If you are using VPN on a northbound ESG, migrating to active-standby tier-0 is recommended. In other cases, migrating the ESGs/DLRs to tier-1 is recommended. An ESG and a DLR can be merged in one mapping entry.
- Create tier-0 and tier-1 gateways and configure dynamic or static routing on the tier-0 gateways towards the northbound routers based on your requirements.
- After configuring the dynamic routing on tier-0 gateways, check that the dynamic routing has converged, that is, BGP sessions are established or OSPF neighborships are FULL as applicable. After this, proceed with providing the mapping.
An example of a mapping file that maps ESGs to a tier-0 gateway:
[
{
"name":"nsxv-to-nsxt-mapping",
"v_edges_to_policy_gateways_mappings":[
{
"v_edges":[
"edge-1",
"edge-2"
],
"policy_gateway_name": "tier0-gateway"
"policy_gateway_path": "/infra/tier-0s/tier0-gateway"
}
]
}
]
