Company XYZ is designing the IS-IS deployment strategy for their multiarea IS-IS domain. They want IS-IS neighbor relationships minimized on each segment and the LSDB size optimized. Which design can be used?
A.
Design all routers as Level 2 routers. Set the links between the routers as Level 1 with the area
B.
Design the network so that the routers connecting to other areas are Level 2 routers and internal routers are Level 1
C.
Design the network so that all routers are Level 1 routers
D.
Design the network so that the routers connecting to other areas are Level 1/Level 2 routers and internal routers are Level 1
D (L1/L2 for ABRs and L1 for internal routers):This hierarchical approach minimizes LSDB size inside areas (L1 routers only maintain intra-area routes) while L1/L2 routers handle inter-area route propagation, reducing neighbor adjacencies and improving scalability.
Other options explained:
A: Level 2 everywhere results in larger LSDBs across all routers.
B: Only L2 routers at ABRs would isolate L1 domains improperly.
C: Pure L1 design prevents inter-area reachability.
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