Overview
![transit_gateway](../files/transit_gateway.svg)
- 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
- No overlapping CIDR support
- Limited visibility
- No ping, traceroute, telnet etc.
- No visibility of other networking constructs