Dynamic Routing using Cloud Router

Lab Details:

  1. This lab walks you through GCP Cloud Router.

  2. Region: us-central1

  3. Duration: 45 minutes

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What is Cloud Router?

  • Cloud Router can't be used by itself but it is required for Cloud NAT or Interconnect or VPN.

  • From Fig1: Let's understand the concept with the help of the below architecture. Consider you have a VPC Network on Google Cloud and an On-premise office network that was connected using VPN Gateway. After a few days, a new network is added to the on-premise network with a name server network. Now you have to add static routes to the routing table in Google Cloud manually and also you need to re-configure your VPN. This is still fine but considers a case when a new network is added quite frequently or the network is destroyed. Same you have to do manually.

  • From Fig2: Now, Cloud Router helps you overcome the above problem by automatically adding dynamic routes. Cloud Router peers with on-premise VPN Gateway or Router. The routers exchange topology information through BGP(Border Gateway Protocol). The Cloud Router advertises subnets from its VPC Network to the on-premise gateway via BGP. By doing this, any topology changes will be propagated automatically between your VPC and on-premise network. The Cloud Router learns on-premise routes through BGP.

  • From Fig3: Users don't sense disruptions, as you see if a link fails to VM1, Cloud Router can automatically re-route traffic if a path is available.

Lab Tasks:

  1. Creating a GCP Cloud Router.

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