VOS SD-WAN uses tunnel virtual interfaces (tvi) interfaces. They are point-to-multipoint interfaces, so they can be used to establish multiple dynamic and static tunnels that are sourced from them. Tvi interfaces are used to establish static control plane tunnels toward Controller nodes and dynamic data plane tunnels toward other branches.

For each tenant on an SD-WAN device or Controller node, the VOS software generates two tvi interfaces, numbering them using the following formulas:

Clear-text tunnel—tenant-id-number x 2

IPsec tunnel—(tenant-id-number x 2) + 1

For example, let's say an SD-WAN device has two tenants, Tenant-1 and Tenant-2, with tenant IDs of 166 and 167, respectively. Here, the VOS software generates the following tvi interfaces names and numbers:

Tenant-1

Tenant ID—166

Clear-text tunnel—(166 x 2) = 332, so the interface name is tvi-0/332

IPsec tunnel—(166 x 2) + 1 = 333, so the interface name is tvi-0/333

Tenant-2

Tenant ID—167

Clear-text tunnel—(167 x 2) = 334, so the interface name is tvi-0/334

IPsec tunnel—(167 x 2) + 1 = 335, so the interface name is tvi-0/335