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300-410 · Question #63

Refer to the exhibit. Which routes from OSPF process 5 are redistributed into EIGRP?

The correct answer is B. RIP learned routes are distributed to OSPF with a tag value of one. When routes learned via RIP are redistributed into OSPF, they are often assigned a tag value of one. This tag serves as an identifier for these external routes within the OSPF domain, allowing for filtering or policy-based routing.

Layer 3 Technologies

Question

Refer to the exhibit. Which routes from OSPF process 5 are redistributed into EIGRP?

Options

  • AOSPF redistributes RIP routes only if they have a tag of one
  • BRIP learned routes are distributed to OSPF with a tag value of one
  • CRIP adds one to the metric for RIP learned routes before redistributing to OSPF
  • DRIP routes are redistributed to OSPF without any changes

How the community answered

(42 responses)
  • A
    2% (1)
  • B
    95% (40)
  • C
    2% (1)

Why each option

When routes learned via RIP are redistributed into OSPF, they are often assigned a tag value of one. This tag serves as an identifier for these external routes within the OSPF domain, allowing for filtering or policy-based routing.

AOSPF redistributes RIP routes only if they have a tag of one

This statement incorrectly frames the direction of redistribution and the conditions for tagging; the context is typically RIP routes being redistributed *into* OSPF, not OSPF redistributing RIP routes based on a tag.

BRIP learned routes are distributed to OSPF with a tag value of oneCorrect

When RIP learned routes are redistributed into an OSPF routing domain, it is a common practice, and sometimes a default behavior in certain configurations, for the OSPF process to assign a tag value of '1' to these external routes. This tag can then be utilized for policy-based control or filtering within OSPF.

CRIP adds one to the metric for RIP learned routes before redistributing to OSPF

RIP itself does not add to its metric before redistribution into OSPF; metric manipulation for redistributed routes is handled by the receiving routing protocol (OSPF) via commands like `default-metric` or route-maps.

DRIP routes are redistributed to OSPF without any changes

RIP routes are generally not redistributed to OSPF without any changes; at minimum, their metric type and value are adjusted to be compatible with OSPF, and tags are often added.

Concept tested: RIP to OSPF Redistribution Tagging

Source: https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/7039-7.html

Topics

#Route Redistribution#OSPF#RIP#Route Tagging

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