Naming conventions

The examples in this guide often use the following variables:

Variable	Description	Value
ul-id	Underlay ID	1 for INET 2 for MPLS
branch-id	Branch ID	1 for Branch1 2 for Branch2
dc-id	Datacenter ID	1 for DC1 2 for DC2
overlay-id	Overlay ID	<ul-id><dc-id>

The overlay-id variable deserves a bit of an explanation. Because Spokes will build tunnels to each of the Hubs over each of the underlays, effectively we will have 4 separate overlay networks. And we will identify them by the combination of the other two variables (<ul-id><dc-id>):

Underlay	Hub	Overlay ID
INET	DC1_FGT	11
INET	DC2_FGT	12
MPLS	DC1_FGT	21
MPLS	DC2_FGT	22

As you will see, all these variables will be often used in naming and IP addressing, which will be particularly crucial when we define CLI templates.

To begin with, LAN subnets on each site are defined as follows:

Site Type	LAN Subnet
Branch	10.0.<branch-id>.0/24
DC	10.<dc-id>.0.0/24