What is the recommended way to configure multiple VLANs for egress traffic?

The recommended way to configure multiple VLANs for egress traffic involving the use of on-premises routers lies in advertising routes with the same Multi-Exit Discriminator (MED). By configuring your on-premises router to advertise routes with the same MED, you can signal to the Google Cloud network which route should be preferred under specific conditions when making routing decisions. This technique helps in managing how traffic should exit the cloud environment, ensuring consistency and control over routing choices.

VLANs are typically used to segment network traffic, optimizing performance and security. In this context, maintaining consistency in route preference via MED facilitates better traffic management and can contribute to increasing redundancy and resilience in the network architecture. It’s essential, especially in a multi-VLAN setup, to ensure that egress traffic flows effectively and adheres to the desired routing policies, making this approach advantageous.

In contrast, choosing to create different regions for redundancy lacks a direct correlation with VLAN configuration, as regions pertain more to geographical distribution rather than VLAN segmentation. Ensuring that both VLANs use the same IP address range could lead to routing conflicts and is generally not recommended for efficient VLAN setups. Limiting VLANs to single Cloud Router connections is not advisable either, as this restriction can curtail flexibility and