300-510 SPRI: Implementing Cisco Service Provider Advanced Routing SolutionsDemo

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Refer to the exhibit. IS-IS is the IGP for the network, with routers R1, R2, R3, and R4 acting as Level 1 routers in Area 12, and routers R5 and R6 acting as Level 2 routers in area 16. Under the network design, router R1 must send traffic to R6 with R4 as its next hop. To satisfy this requirement, a network engineer configured route filtering on R2 to stop the route to R6 from being advertised by R2. However, R1 still uses R2 as its next hop. What action must the engineer take to fix the issue?

A Move all routers into the same IS-IS area.
B Disable wide area metrics and use only cost to perform the route manipulation.
C Manipulate link costs to provide the desired routing through R4.
D Configure routers R5 and R6 as Level 1/2 routers.

Explanation

IS-IS uses SPF to prefer the path with the lowest cumulative link metric. Setting the relevant link costs so that the path through R4 has the lower total metric causes R1 to select R4 as the next hop toward R6. Cisco documents that IS-IS can prioritize traffic through particular paths by changing interface metric costs, and that the least-cost path is preferred.

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Cisco: Customizing IS-IS for Your Network Design

300-510 SPRI: Implementing Cisco Service Provider Advanced Routing SolutionsDemo

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