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JN0-102 · Question #255

There are three static routes in the routing table that need to be announced to your OSPF peers. Which method is used to accomplish this?

The correct answer is D. Apply an export policy to OSPF that injects the static routes into OSPF. To advertise static routes into OSPF, an export policy must be applied to OSPF, specifically identifying and permitting the static routes for redistribution.

Routing Policy and Firewall Filters

Question

There are three static routes in the routing table that need to be announced to your OSPF peers. Which method is used to accomplish this?

Options

  • AApply an import policy to OSPF that injects the static routes into OSPF.
  • BApply an import policy to the static routes that injects the static routes into OSPF.
  • CApply an export policy to the static routes that injects the static routes into OSPF.
  • DApply an export policy to OSPF that injects the static routes into OSPF.

How the community answered

(21 responses)
  • A
    5% (1)
  • B
    10% (2)
  • C
    5% (1)
  • D
    81% (17)

Why each option

To advertise static routes into OSPF, an export policy must be applied to OSPF, specifically identifying and permitting the static routes for redistribution.

AApply an import policy to OSPF that injects the static routes into OSPF.

An import policy on OSPF governs which routes OSPF *receives* and installs into its own routing table from its neighbors, not which routes it *originates* or advertises from other sources like static routes.

BApply an import policy to the static routes that injects the static routes into OSPF.

Routing policies are applied to routing protocols, not directly to static routes themselves; static routes are entries in the routing table that can be matched by policies.

CApply an export policy to the static routes that injects the static routes into OSPF.

Routing policies are applied *to* a routing protocol (like OSPF) to influence its export behavior, not to the source of the routes (like static routes). Static routes are simply the data that the OSPF export policy would match against.

DApply an export policy to OSPF that injects the static routes into OSPF.Correct

To introduce static routes into an OSPF domain, an export policy is applied to the OSPF protocol. This policy identifies the specific static routes and configures OSPF to redistribute them as external LSAs (Type 5 LSAs for inter-area, Type 7 for NSSA) to its peers, making them known throughout the OSPF autonomous system.

Concept tested: Route Redistribution Static to OSPF

Source: https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/16448-ospf-static.html

Topics

#static routing#OSPF#routing redistribution#export policy

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