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Configuring HDLC over MPLS (Video)

by Jeremy L. Gaddis on September 15, 2009 · 2 comments

in Networking

Lately I’ve become interested in MPLS and, unfortunately, have stopped studying what I should be studying and started playing around with MPLS instead. One thing that just fascinates me is AToM, or Any Transport over MPLS. From Cisco:

“Any Transport over MPLS (AToM) is Cisco’s solution for transporting Layer 2 packets over an IP/MPLS backbone.”

In a nutshell, AToM allows us to transport a wide variety of layer 2 traffic (HDLC, PPP, Frame Relay, ATM, Ethernet, …) over an existing IP/MPLS backbone.

To demonstrate, consider the following topology (click for full size):

In the topology, the P, PE1, and PE2 routers make up the service provider’s IP/MPLS backbone. P, PE1, and PE2 belong to us, the service provider, and CE1 and CE2 belong to a customer of ours. The video will show how we can provide the customer with a 256k serial (HDLC) connection over our IP/MPLS backbone. The raw HDLC frames received on the serial 1/0 interfaces of PE1 and PE2 are encapsulated in MPLS and sent over the backbone to the remote PE router, where they are decapsulated and sent back out the customer-facing serial connection.

Here’s a video demonstration so you can see just how cool this is:

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