350-501 Question #288: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. EIGRP is running across the core to exchange internal routes, and each router maintains iBGP adjacency with the other routers on the network. An operator has configured static routes on the edge routers R1 and R2 for IP address 10.0.1.1, which is used as a black hole route as shown. Which configuration should the operator implement to the management router to create a route map that will redistribute tagged static routes into BGP and create a static route to blackhole traffic with tag 777 that is destined to the server at 192.168.10.100? router(config)# route-map blackhole-trigger router(config-route-map)# match tag 777 router(config-route-map)# set ip next-hop 10.0.1.1 router(config-route-map)# set origin igp router{config-route-map)# set community no-export

Options

• Arouter(config)# router bgp 55100
• Brouter(config)# router bgp 55100
• Crouter(config)# router bgp 55100
• Drouter(config)# router bgp 55100

Explanation

To redistribute tagged static routes into BGP and blackhole specific traffic, the engineer must define a static route for the server with tag 777 pointing to Null0 and then configure BGP to redistribute static routes matching a route map that filters on tag 777.

Common mistakes.

• A. This option fails to configure the necessary static route for 192.168.10.100 with tag 777 and uses redistribute connected, which is not the specified requirement for redistributing static routes.
• C. This option does not configure the required static route with tag 777 for 192.168.10.100 and uses redistribute ospf, which is incorrect for redistributing static routes.
• D. This option lacks the configuration for the static route with tag 777 and uses redistribute eigrp, which is not the correct command for redistributing static routes.

Concept tested. BGP redistribution of static routes using route maps and tagging

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-3s/asr1000/b_bgp_xe_3s_asr1000_chapter_01.html

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