350-501 Question #443: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. Customer_A asked ISP_A to connect two offices via an MPLS L3 VPN. Customer_A is currently using only the default route toward ISP_A. The engineer at ISP_A already configured the ip route vrf Customer_A 172.16.10.0 255.255.255.0 10.10.10.1 command on R1. Which action completes the configuration?

Options

• AConfigure the redistribute static and redistribute connected commands on R1.
• BEnable the bgp default route-target filter and default-information originate commands under the
• CConfigure the route-target both 200:1 and route-replicate vrf Customer_A commands under the ip
• DConfigure the network 172.16.10.0 and redistribute-internal static commands under the BGP

Explanation

To complete the MPLS L3 VPN configuration and ensure the 172.16.10.0/24 static route within VRF Customer_A is advertised across the VPN, R1 must be configured to redistribute static routes into its BGP VRF address family.

Common mistakes.

• B. default-information originate advertises a default route, not the specific static route 172.16.10.0/24. bgp default route-target filter controls route target propagation, not route advertisement.
• C. route-target both 200:1 is part of VRF definition for import/export policies, but does not itself advertise routes. route-replicate vrf is not a standard Cisco IOS command for this purpose.
• D. While a network command could advertise a directly connected route in the VRF, for a static route, redistribute static is the correct mechanism. redistribute-internal static is not the correct command syntax; it should simply be redistribute static.

Concept tested. MPLS L3 VPN BGP route redistribution (static routes)

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-16/irg-xe-16-book/bgp-addr-fam-config.html

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