NSE4 · Question #222
Review the output of the command get router info routing-table all shown in the Exhibit below; then answer the question following it. Which one of the following statements correctly describes this out
The correct answer is A. The two routes to the 10.0.2.0/24 subnet are ECMP routes and traffic will be load balanced based. The routing table displays two identical OSPF routes to the 10.0.2.0/24 subnet, indicating they are Equal-Cost Multi-Path (ECMP) routes that will be used for load balancing.
Question
Review the output of the command get router info routing-table all shown in the Exhibit below; then answer the question following it. Which one of the following statements correctly describes this output?
Exhibit
Options
- AThe two routes to the 10.0.2.0/24 subnet are ECMP routes and traffic will be load balanced based
- BThe route to the 10.0.2.0/24 subnet via interface Remote_1 is the active and the route via
- COSPF does not support ECMP therefore only the first route to subnet 10.0.1.0/24 is used.
- D172.16.2.1 is the preferred gateway for subnet 10.0.2.0/24.
How the community answered
(21 responses)- A81% (17)
- B10% (2)
- C5% (1)
- D5% (1)
Why each option
The routing table displays two identical OSPF routes to the 10.0.2.0/24 subnet, indicating they are Equal-Cost Multi-Path (ECMP) routes that will be used for load balancing.
The output shows two OSPF routes to the 10.0.2.0/24 subnet with the same administrative distance (110 for OSPF) and metric. This configuration signifies Equal-Cost Multi-Path (ECMP) routing, where FortiGate will load balance traffic across both available paths to that destination.
When multiple routes have identical administrative distance and metric, they are both considered active ECMP routes, and neither is exclusively preferred over the other.
OSPF fully supports ECMP, allowing multiple paths with equal cost to a destination, as demonstrated by the output for the 10.0.2.0/24 subnet.
In an ECMP setup, there isn't a single preferred gateway; traffic is distributed across all equal-cost gateways.
Concept tested: ECMP routing and OSPF behavior
Source: https://docs.fortinet.com/document/fortigate/7.4.0/administration-guide/526732/ecmp-and-load-balancing
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