In this post we will look at the Carrier Supporting Carrier design where smaller service providers use large service providers as backbone in order to connect parts of their network which eliminates the need to build and maintain their own MPLS network.
From customer's point of view, there is no difference in terms of connectivity and it will still appear as they have a normal Layer 3 MPLS connection from the provider.
Let's look at the below topology to understand how it works.
We have a Tier 2 SP who is providing services to customer sites in two different geographical locations. The service provider have their own network within specific regions but not connected with each other directly hence they are using Tier 1 SP's backbone to connect both of their networks and provide end-to-end connectivity to the customer.
From customer's point of view, there is no difference in terms of connectivity and it will still appear as they have a normal Layer 3 MPLS connection from the provider.
Let's look at the below topology to understand how it works.
We have a Tier 2 SP who is providing services to customer sites in two different geographical locations. The service provider have their own network within specific regions but not connected with each other directly hence they are using Tier 1 SP's backbone to connect both of their networks and provide end-to-end connectivity to the customer.
