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Article | REF: TE7581 V1

Interconnection AS models for MPLS L3VPN

Author: David JACQUET

Publication date: April 10, 2017

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1. Inter AS VPN context

1.1 L3VPN MPLS

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1.1.1 Preamble

An Autonomous System (AS) is an IP network or set of IP networks under the control of the same administrative entity. Within an AS, a single internal routing protocol (IGP) is generally used.

The BGP routing protocol is used to interconnect ASes. It enables public IP prefixes to be announced from one AS to another and vice versa. These exchanges of prefixes, according to rules specific to each AS, form the inter-domain policy. The result of these interconnections,...

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