CCDE: Cisco Certified Design Expert (Written) — Question 10

Service provider XYZ plans to provide dedicated Internet access and MPLS L3VPN services to business customers. XYZ has these design specifications:
- MP-BGP running on the core MPLS P routers with external Internet routes.
- The core network will include 16 Point of Presence IP POPs throughout the Asia-Pacific region.
- An additional nine non-P routers will use EBGP peering with multiple providers for Internet traffic.
- An additional 50 PE routers will provide end customers with dedicated Internet access and L3VPN services throughout the Asia-Pacific region.
In what two ways can the MP-BGP be removed from the MPLS P core routers and still provide dedicated Internet access and MPLS L3VPN services? (Choose two.)

Answer options

• A. Disable BGP from the MPLS core P routers and have the MPLS core P routers run OSPF and LDP.
• B. Enable separate BGP control plane routers using a route reflector server concept that will be fully meshed with peer route reflector servers and have clients as MPLS PE routers and EBGP peering routers.
• C. Enable all EBGP routers as route reflector servers and MPLS PE routers as their clients.
• D. It is not possible to disable BGP from the MPLS core P routers without impacting the dedicated Internet access and MPLS L3VPN services.

Correct answer: B, C

Explanation

Options B and C are correct as they provide mechanisms to maintain communication and routing integrity without directly relying on MP-BGP in the core. Option A would disrupt existing routing capabilities by removing BGP entirely, and Option D incorrectly states that it's impossible to remove BGP without impacting services, which is not true with the right configuration.