300-410 ENARSI: Implementing Cisco Enterprise Advanced Routing and ServicesDemo

By Cisco · Question Mode

QuestionQ18

Layer 3 Technologies

An engineer configured routing across multiple OSPF domains and introduced a routing loop that resulted in network instability. Which action fixes the issue?

  • A Set a tag using the redistribute command toward a domain and deny inbound in the other domain by a matching tag.
  • B Set a tag using the redistribute command toward a different domain and deny the matching tag when exiting from that domain.
  • C Set a tag using the network command in a domain and use the route-map command to deny the matching tag when exiting toward a different domain.
  • D Set a tag using the network command in a domain and use the route-map command to deny the matching tag when entering into a different domain.
Explanation

Routes redistributed from an OSPF domain should be tagged at redistribution and filtered inbound by the same tag in the other domain. This prevents routes that originated in a domain from being installed after returning through another domain, so they cannot be redistributed back into their source domain and form a routing loop.

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