Separate routing tables kept inside a single router. In NSX these take the form of Tier-0 VRF gateways, each attached to a parent Tier-0.
Also called virtual routing and forwarding.
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Terms in this definition
- Geographic
A Traffic Manager routing method that picks the endpoint according to where the user is located geographically.
- NSX
Software that handles networking and security across VCF, covering firewalling, load balancing, NAT, VPCs, overlay segments and Tier-0/1 gateways.
Related terms
- Active/standby Tier-0
Required by the VPC with Full Services model (itself needed for automatic VPC SNAT and all VCF Automation tenancy models), this Tier-0 HA mode sends all traffic through one elected NSX Edge node, with a second ready to take over on failure. More north-south capacity therefore means adding Tier-0 or VRF gateways, not edge nodes.
- ASN
Autonomous system number: the identifier of a BGP routing domain. In VCF, every NSX Tier-0 or VRF gateway peers with the physical fabric over eBGP using its own private ASN, which stops BGP loop prevention discarding its routes; an internet-facing gateway uses a public ASN instead.
- GRE
A tunnel type for linking on-premises with cloud networks from NSX Tier-0 and Tier-0 VRF gateways. L2 VPN in NSX also builds a single tunnel of this kind for each of its sessions.
- Large Scale Topology
Built mainly for service providers with many tenants, this NSX workload networking model gives each tenant a dedicated Tier-0 gateway or VRF, keeping its own VPN, behind a shared stateless Active/Active aggregation Tier-0 that centralises common services such as internet access.
- provider gateway
Gives tenant organisations in VCF Automation a route to external networks, built on an NSX Tier-0 (or Tier-0 VRF) gateway and drawing addresses from linked IP spaces. Several organisations may share one.