Refer to the exhibit. BGP is running in the core of the service provider to exchange routes for its customers, and OSPF serves as the PE-CE routing protocol. The service provider's existing customer at CE1 is opening a new office in a different geographical location connected via CE2. A network engineer must update the BGP implementation so that PE1 and PE2 will share routes and provide communication between CE1 and CE2. Which action must the engineer take?

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A. Configure PE1 and PE2 to mutually redistribute BGP and OSPF in the VRF for the customer To achieve full connectivity between CE1 and CE2 using OSPF as the PE-CE protocol in an MPLS L3 VPN, the PE routers (PE1 and PE2) must be configured for mutual redistribution, injecting OSPF routes into BGP for VPN propagation and BGP-learned routes back into OSPF for the local CE.

Answer

B. Configure CE1 and CE2 with a pseudowire that will run over the service provider core Configuring a pseudowire for CE1 and CE2 would establish a Layer 2 VPN (L2VPN), which is a different solution than updating the BGP implementation for route sharing in a Layer 3 VPN (L3VPN).

Answer

C. Configure PE1 and PE2 to redistribute OSPF from the VRF for the customer into BGP Redistributing only OSPF into BGP (one-way) would allow CE routes to propagate across the VPN but would not enable routes learned via BGP from other customer sites to be injected back into the local OSPF domain for the CE.

Answer

D. Configure CE1 and CE2 to establish a BGP relationship with PE1 and PE2 The question specifies OSPF as the PE-CE routing protocol, so changing to a BGP PE-CE relationship would be a redesign, not an update to the current BGP implementation with OSPF as PE-CE.

Refer to the exhibit. BGP is running in the core of the service provider to exchange routes for its customers, and OSPF serves as the PE-CE routing protocol. The service provider's existing customer…

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