How to build resilient industrial networks

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Building Resilient Networks
November

Agenda
 Introductions
 Who is Westermo
 Defining Network Resiliency
 Hardware Redundancy
 Microsegmentation
 Configu...

3
Introductions
Dakota Diehl
Network Application Engineer
dakota.diehl@westermo.us
847.453.3899
Benjamin Campbell
Technica...

4
Westermo Group 2020
 Founded in 1975
 Industry leading software and hardware
development force
 Own production in Swe...

How To Build a Resilient
Network

6
 Resilience in computer networks is the “ability to provide and maintain an acceptable
level of service in the face of ...

Hardware Redundancy

8
 One of the most straightforward ways to improve resiliency is to add redundancy
 If one node or link suffers a catast...

9
 Built in functions to avoid uncontrolled broadcast storms.
 Link integrity control.
 Non-FRNT ports are not allowed ...

10
Layer 2 Redundancy: FRNT Ring Coupling
FRNT
Master
Ring
FRNT
Sub
Ring
FRNT
Sub
Ring
FRNT
Sub
Ring

11
Layer 2 Redundancy: FRNT Ring Coupling
X
X
X
FRNT
Master Ring
FRNT
Sub Ring
FRNT
Sub Ring

12
 Within the Network Layer, there are many options to add resiliency to a network:
 RIP
 OSPF
 VRRP
 RIP and OSPF a...

13
Routing Protocols create resiliency on L3, between L2 Networks
Dynamic Routing Protocols
FRNT
VRRP
VRRP VRRP
FRNT FRNT
...

14
Combining Layer 2 and Layer 3 resilience functionality allows for
extremly high availablity.
FRNT Super Ring
FRNT Sub R...

Microsegmentation

16
Hybrid L2/L3 Network
L2 ring topology 20-30ms
re-convergence time
L3 routing and FW at each
node creates a Zone
X Dynam...

17
Efficient Routing to Minimize Network Delay
Network backbone
Router firewall Router firewall Router firewall
Messages a...

18
Multiple Zones
Backbone Fibre
ZONE 1
10.10.10.0/28
ZONE 2
10.20.20.0/28
Traffic cannot pass
between zones
unless it is ...

19
Maintainer’s Sandbox Connection
Backbone Fibre
ZONE 1
10.10.10.0/28
ZONE 2
10.20.20.0/28
Traffic cannot pass
between zo...

Configuration Backups

21
Getting Control of the Assets
 Using common UN and PW are an open
door to cyber actors
 Maintainers leave taking the ...

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