Hi @Ibrahim Jamil ,
Choosing between Routed Interface | SVI | Sub-Interface for a L3OUt interface
A picture always helps.
Routed Interface Advantages
- You get the full 10G/25G/100G bandwidth for a single connecting subnet
Routed Interface Disadvantages
- If you choose a routed interface, the other end must also be a routed interface, assuming they are directly connected.
- Routed interfaces do not support VLAN traffic
- All traffic is untagged
SVI | Sub-Interface Advantages
- Both interface types support VLANs, allowing multiple subnets to traverse the link
- This can be useful for a multi-tenanted situation where tenants share a L3Out
Sub-Interface Disadvantages
- If the remote router/firewall is connected via VPC, you can't use sub-interfaces. You have to use SVI Interfaces
Usage Guidelines
If the remote device is sending untagged traffic, use a routed interface. In all other cases, a SVI interface is the better and more flexible option.
Disclaimer
This is my limited and humble opinion. There MAY be more options for rate-limiting if using sub-interfaces. I haven't explored this option.
