400-007: Cisco Certified Design ExpertDemo

By Cisco · Question Mode

QuestionQ321

Network Design

An enterprise network contains two core routers connected to 200 distribution routers and uses full-mesh iBGP peering among these routers for routing.

The distribution routers are seeing high CPU utilization from the BGP process. Which design solution is the most cost-effective?

  • A Increase the memory on the core routers.
  • B Increase bandwidth between the core routers.
  • C Implement eBGP between the core and distribution routers.
  • D Increase the memory on the distribution routers.
  • E Implement route reflectors on the two core routers.
Explanation

Route reflectors remove the requirement for every iBGP speaker to peer with every other iBGP speaker. Configuring the two core routers as route reflectors allows the distribution routers to be reflector clients, greatly reducing the number of BGP sessions and associated control-plane processing without requiring hardware upgrades. Cisco documents route reflection as the scalable alternative for reducing an iBGP full mesh.

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