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.
Question
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)- A2% (1)
- B95% (40)
- C2% (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.
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.
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.
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.
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
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