It is desirable for the provider to be able to integrate the second autonomous system without disrupting existing customer peering arrangements. Updated: September 12, Customer peering sessions can later be updated during a maintenance window or during other scheduled downtime. This feature allows the network operator to merge the autonomous systems and then later migrate customers to new configurations during normal service windows without disrupting existing peering arrangements. The neighbor local-as command is configured to allow Router 1 to maintain peering sessions through autonomous system and autonomous system The larger the number of customer peerings, the greater the risk. Router 2 is a customer router that runs a BGP routing process in autonomous system and is configured to peer with autonomous-system Configuration Examples for Dual-AS Peering for Network Migration Example: Dual AS Configuration The following examples shows how this feature is used to merge two autonomous systems without interrupting peering arrangements with the customer network. Autonomous system migration can be necessary when a telecommunications or Internet service provider purchases another network.
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