350-501 · Question #488
Refer to the exhibit. AS 65517 is running OSPF within the core. BGP is running between all four autonomous systems, interconnecting several ISPs that provide intranet and extranet services. All of the
The correct answer is B. Configure P1 as a route-reflector-client to PE1.. In this scenario, P1 cannot reach external routes because it is not receiving all the required BGP routes. To resolve this, configuring P1 as a route- reflector-client to PE1 will allow PE1 to reflect external routes learned from other PEs (e.g., PE2, PE3, PE4) to P1. This avoids
Question
Refer to the exhibit. AS 65517 is running OSPF within the core. BGP is running between all four autonomous systems, interconnecting several ISPs that provide intranet and extranet services. All of the PE routers are connected, and eBGP peering relationships have been established. A network engineer also configured an IBGP peering between PE1 and P1, and the peering is up. However, P1 cannot reach routes outside of AS 65517. Which action must the engineer take so that P1 reaches external routes?
Exhibit
Options
- ASynchronize BGP and OSPF with AS 65517.
- BConfigure P1 as a route-reflector-client to PE1.
- CInstall route targets on alt PE routers under the VRF configuration for intranet services.
- DAdd the next-hop-self attribute under the BGP neighbor configuration for P1 on PE3.
How the community answered
(22 responses)- A5% (1)
- B73% (16)
- C14% (3)
- D9% (2)
Explanation
In this scenario, P1 cannot reach external routes because it is not receiving all the required BGP routes. To resolve this, configuring P1 as a route- reflector-client to PE1 will allow PE1 to reflect external routes learned from other PEs (e.g., PE2, PE3, PE4) to P1. This avoids the need for a full mesh of iBGP sessions within AS 65517, simplifying the configuration while ensuring P1 has visibility to external routes. Route reflectors are a common solution to reduce the iBGP full-mesh requirement and ensure proper route dissemination within an AS.
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