What is the difference between HVPN and HoVPN?

Latest reply: Jul 26, 2019 12:33:51 1673 2 1 0

This post explains what is the difference between HVPN and HoVPN. More details to be found below.

The BGP/MPLS IP VPN architecture is a plane model. The performance requirements for each PE on a BGP/MPLS IP VPN are the same. On a hierarchical network configured with BGP/MPLS IP VPN, the access or routing management capabilities of PEs are frequently challenged as the network expands in scale and service types.

As a result, limited network performance and expansibility prevent the VPN services from being deployed on a large scale.

To improve the expansibility, BGP/MPLS IP VPN must adopt the HVPN model. On an HVPN, PEs play different roles and provide different functions. These PEs form a hierarchical architecture to provide the same functions as that are normally provided by a single PE on a non-hierarchical VPN.

Upper-level devices on an HVPN must have strong routing management and forwarding capabilities, but do not need strong access capabilities. Conversely, lower-level devices on an HVPN must have strong access capabilities, but do not need strong routing management or forwarding capabilities.

Different types of devices can be deployed at different hierarchical levels. An HVPN features flexible device deployment and high expansibility. If the access, routing management, or forwarding capabilities of the PEs at a certain hierarchical level cannot meet actual requirements, you can deploy more PEs to that hierarchical level.

They have three roles on the HVPN:

User-end provider edge (UPE): directly connects to CEs and provides access services for users;

Superstratum provider edge (SPE): connects to UPEs and is located at the core of a network. An SPE manages and advertises VPN routes;

Network provider edge (NPE): connects to SPEs and is located at the network side.

They have two configurations on the HVPN - one is called HVPN and the other is called HoVPN.

The difference is as below:

On an HoVPN, SPEs advertise default routes to UPEs. UPEs do not have specific routes to NPEs and can only send VPN service data to SPEs over default routes. As a result, route isolation is implemented. An HoVPN can use devices with relatively poor route management capabilities as UPEs, reducing network deployment costs.

On an H-VPN, SPEs advertise specific routes to UPEs. UPEs function as RR clients to receive the specific routes reflected by SPEs functioning as RRs. This mechanism facilitates route management and traffic forwarding control.


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Created Aug 23, 2018 06:53:05 Helpful(0) Helpful(0)

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Created Jul 26, 2019 12:33:51 Helpful(0) Helpful(0)

Nice article
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