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VPLS (Virtual Private LAN Service) – Part 3 (h-VPLS)

Author: gokhankosem, on 08 Sep 16 - Comments Off on VPLS (Virtual Private LAN Service) – Part 3 (h-VPLS)
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H-VPLS (Hierarchical VPLS)

H-VPLS (Hierarchical VPLS) is the more scalable version of VPLS. Basically, H-VPLS has some architectural difference than flat VPLS.

VPLS Architecture, Flat VPLS

VPLS Architecture, Flat VPLS

In H-VPLS, there are some additional edge devices. These devices are u-PE (User facing Provider Edge) and n-PE (Network facing Provider Edge). By using two different Edge Devices, H-VPLS provide less overhead in n-PE devices. Because, the traffic that is coming from the user, meets with u-PE device firstly.

h-VPLS Architecture

h-VPLS Architecture

In the H-VPLS architecture, customer devices firstly connected to the u-PE device. u-PE devices are connected to n-PE devices with a single Pseudowire (PW). This is for each VPLS service. After that, the n-PE devices are connected as full mesh . The conection of the n-PE devices are like flat VPLS.

For the connection of the access layer of the H-VPLS, there are two mechanisms.
These are:

• H-VPLS with Q-in-Q
• H-VPLS with MPLS

In Alcatel-Lucent devices, we need to configure SDPs as Pseudowires (PW). In H-VPLS all the sites are not have to connect via SDPs. The connection is provided with both mesh SDPs and spoke SDPs. But as you remember, in VPLS, all sites needs to be connected as full mesh with mesh SDP.

Alcatel h-VPLS Architecture

Alcatel h-VPLS Architecture (Full Mesh SDP+ Spoke SDP)

In the following articles, we will talk about h-VPLS more and we aill also discuss the difference Flat VPLS and h-VPLS.

Other VPLS Articles…

VPLS (Virtual Private LAN Service) – Part 1
VPLS (Virtual Private LAN Service) – Part 2 (Alcatel-Lucent VPLS Configuration)
VPLS (Virtual Private LAN Service) – Part 3 (h-VPLS)
VPLS (Virtual Private LAN Service) – Part 4 (VPLS versus h-VPLS)
VPLS (Virtual Private LAN Service) – Part 5 (Cisco VPLS Configuration)

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About the Author
Gokhan Kosem is a telecommunation and network engineer. His ambition to IP networks and end-to-end system installation made him to prepare this web-site. By sharing his experiences about various networking protocols beside different system installation experiences and Cisco, Juniper, Alcatel-Lucent devices configurations, he is aimed to be helpful for his collegues in all over the world. He is currently lives in Istanbul, Turkey.

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