AWS Transit Gateway (TGW)

Overview

• Hub and spoke connectivity for VPCs
• Default any-to-any communication
• Need to manage:
  • VPC route tables
  • TGW route tables
  • VPC attachments
  • Route table associations
  • Route propagation

Challenges

• 20 CIDR limit to advertise to on-prem DC
• 100 CIDR limit to advertise to on-prem AWS from on-prem
• Manual route table management
• No intra-region TGW peering
• Limited to inter-region peering support
  • Each region—island
• No overlapping CIDR support
• Limited visibility
  • No ping, traceroute, telnet etc.
  • No visibility of other networking constructs