Taking a closer look at scaled out network patterns indicates some of the potential
issues that would develop. If you start building microservices with four applications
hosted on different networks that all need to talk to each other, you will need to create
connections between all of them, creating a tangled web with no centralized manage-
ment. With no single pane of glass that looks into all the networks, it is cumbersome to
troubleshoot connectivity issues. Therefore, the traditional hub-and-spoke connectivity
model needs to evolve from a peering based approach to a more transitive one.
VPN
Replicated
Services
VPN
Gateway
Shared
Services
Hub
Peer
Peer
Peer
Peer
Spoke 1
Peer
Peer
Spoke 2
Peer
Spoke 3
Figure 1: A tangled hub-and-spoke configuration
20 | THE DOPPLER |
SUMMER 2019
Spoke n