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NSE4 · Question #257

If Open Shortest Path First (OSPF) has already been configured on a FortiGate unit, which of the following statements is correct if the routes learned through OSPF need to be announced by Border…

The correct answer is C. At a minimum, the network administrator needs to enable Redistribute OSPF in the BGP settings. To announce routes learned through OSPF by BGP, a FortiGate administrator must explicitly enable OSPF route redistribution within the BGP settings.

Submitted by cyberguy42· Apr 18, 2026Routing and SD-WAN

Question

If Open Shortest Path First (OSPF) has already been configured on a FortiGate unit, which of the following statements is correct if the routes learned through OSPF need to be announced by Border Gateway Protocol (BGP)?

Options

  • AThe FortiGate unit will automatically announce all routes learned through OSPF to its BGP peers
  • BThe FortiGate unit will automatically announce all routes learned through OSPF to its BGP peers
  • CAt a minimum, the network administrator needs to enable Redistribute OSPF in the BGP settings.
  • DThe BGP local AS number must be the same as the OSPF area number of the routes learned
  • EBy design, BGP cannot redistribute routes learned through OSPF.

How the community answered

(27 responses)
  • A
    4% (1)
  • C
    93% (25)
  • D
    4% (1)

Why each option

To announce routes learned through OSPF by BGP, a FortiGate administrator must explicitly enable OSPF route redistribution within the BGP settings.

AThe FortiGate unit will automatically announce all routes learned through OSPF to its BGP peers

FortiGate does not automatically redistribute routes between different routing protocols; explicit configuration is required.

BThe FortiGate unit will automatically announce all routes learned through OSPF to its BGP peers

FortiGate does not automatically redistribute routes between different routing protocols; explicit configuration is required.

CAt a minimum, the network administrator needs to enable Redistribute OSPF in the BGP settings.Correct

By default, routing protocols on a FortiGate do not automatically redistribute routes learned from one protocol into another. To announce routes learned via OSPF to BGP peers, the administrator must explicitly configure route redistribution within the BGP settings, specifically enabling the 'redistribute ospf' command.

DThe BGP local AS number must be the same as the OSPF area number of the routes learned

The BGP local AS number and OSPF area number are distinct identifiers for different routing protocols and do not need to be the same for redistribution to occur.

EBy design, BGP cannot redistribute routes learned through OSPF.

BGP is designed to redistribute routes from other routing protocols, including OSPF; this statement is incorrect.

Concept tested: FortiGate BGP OSPF route redistribution

Source: https://docs.fortinet.com/document/fortigate/7.4.0/administration-guide/500140/redistributing-routes-to-bgp

Topics

#Route Redistribution#BGP#OSPF#FortiGate Routing

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