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MPLS Fundamentals by Luc De Ghein - CCIE No. 1897

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Chapter 7

1. What is a route distinguisher?
A1: Answer: A route distinguisher is a 64-bit value—chosen by the service provider—that is appended to the IPv4 routes of the customer and makes the routes unique.
2. How is a packet that is coming from the CE router identified as to which VRF it belongs?
A2: Answer: The packet is identified as belonging to a VRF by the VRF configuration on the interface.
3. What is the purpose of RTs?
A3: Answer: You use RTs to import vpnv4 routes into the VRF routing table and to export the vpnv4 routes to VRF sites that accept the RT.
4. What is an RR group?
A4: Answer: An RR group can be configured on route reflectors to filter vpnv4 routes.
5. What is the BGP neighbor command with as-override used for?
A5: ...

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