Dive into the depths of routing on AWS (NET318)

Here is a detailed summary of the video transcription in Markdown format, with the key takeaways broken down into sections for better readability:

Fundamentals of Routing on AWS

• Route: A destination and the path (next hop) to get there
  • Routing Information Base (RIB) vs Forwarding Information Base (FIB)
• AWS Routing Components:
  • Static routes: Manually configured by the administrator
  • Propagated routes: Automatically propagated based on the existence of a route elsewhere
  • Dynamic routes: Usually using Border Gateway Protocol (BGP)
• Route Preference Order: Static > Propagated > Dynamic (except for more specific dynamic routes)

Routing within a Single VPC

• Comparison of on-premises and AWS networking constructs
• Subnets and route tables: Allowing granular control over routing within a VPC
• Ingress routing: Redirecting traffic coming into the VPC through a network function (e.g., firewall)
• More specific routing: Overriding local route behavior for traffic between subnets

Resilience in Static Routing

• Targeting highly available resources (e.g., NAT Gateway, Network Firewall, Transit Gateway)
• Using AWS Gateway Load Balancer for self-hosted solutions

Connecting to On-Premises with Direct Connect and VPN

• Connecting a VPC to an on-premises data center using Direct Connect and VPN
• Propagating routes dynamically vs. using static routes
• Failover and resiliency using BGP with Bidirectional Forwarding Detection (BFD)

Connectivity Between Multiple VPCs

• Using AWS Transit Gateway for VPC-to-VPC connectivity
• Propagating routes dynamically and creating route tables for Transit Gateway attachments
• Inserting network functions (e.g., firewalls) between VPCs using Transit Gateway

Multi-Region Connectivity and Inspection

• Expanding to multiple regions using Transit Gateway peerings
• Performing inspection between regions using multiple route tables

AWS Cloud WAN for Multi-Region Networking

• Core Network Edge (CNE): Managed regional routing component
• Segments: Global routing domains
• Policies: Defining intent for networking configuration
• Single-hop vs. dual-hop inspection

Hybrid Connectivity and Load Balancing

• Redundancy in Direct Connect connections across locations
• Providing connectivity from on-premises to S3 using public virtual interfaces
• Connecting on-premises to VPCs using private virtual interfaces
  • Influencing traffic paths using BGP attributes (AS-path prepending, local preference)