If you are thinking about how to implement a Dual-Router Dual-Homed topology, you should consider these tips in order to guarantee traffic optimization and failover:
- Use provider-independent IP address space to allow for advertisement to both ISPs (make sure not to configure your network as a transit network between autonomous systems, apply route filtering).
- Request a public BGP AS number for eBGP connections to the ISPs.
- Receive full or partial Internet routing tables to optimize forwarding outbound.
- Use a FHRP or an IGP internally.
- Whenever possible, use SD-WAN.
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