Which routing protocol is used by the PE router to advertise routes to a CE router without redistribution or static after removing the RD tag from the P router?
BGP IPv4 doesn't support the VPNv4 address family, which is needed for advertising routes that include customer-specific information (like the RD and RT tags).
MP-BGP (Option D) is the protocol that supports the additional features required to advertise VPN routes correctly, even after the RD is removed from the P router.
ChatGPT:
clarify the concepts related to BGP (Border Gateway Protocol) and VRF (Virtual Routing and Forwarding):
Non-MP-BGP: Traditional BGP, often referred to as Classical BGP, does not have inherent support for VRF (Virtual Routing and Forwarding). In a non-MP-BGP environment, BGP operates in a flat routing table structure that does not distinguish between multiple virtual routing tables. Therefore, it is not VRF-aware.
MP-BGP (Multiprotocol BGP): On the other hand, MP-BGP, which extends BGP to support multiple network layer protocols, including IPv6 and VPNs (using the VPNv4 and VPNv6 address families), is VRF-aware. MP-BGP is specifically designed to work with MPLS (Multiprotocol Label Switching) and allows for the separation of routing information per VRF instance. This capability supports the creation of overlapping IP address spaces in different VRFs, allowing service providers to offer VPN services without address conflicts.
In summary:
Traditional BGP (non-MP-BGP) is not VRF-aware.
MP-BGP (Multiprotocol BGP) is VRF-aware and is commonly used in MPLS VPN scenarios.
please, why is not OSPF ? When the PE delete the RD from MP-BGP, it can advertise the routes directely to the process OSPF without redistribution ...can someone enlighten me ?
I guess I'm getting BGP version 4 and bgp ipv4 mixed up.
VRF I believe is a MPBGP extension. However we need standard vrf ipv4 to run ebgp between a CE and PE. I will go with B.
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