When connecting the e-commerce submodule to multiple ISPs, multiple design topologies can be implemented:
- One firewall per ISP
- Stateful failover with a common external prefix
- Distributed data centers
One Firewall per ISP
The most common e-commerce design topology for connecting multiple ISPs is to have a single firewall per provider. The path to each ISP will be managed by a dedicated edge router that is positioned in front of the firewalls, as illustrated in Figure 8.7 below: