300-510 · Question #275
Refer to the exhibit. A company has been running OSPF and EIGRP on two separate portions of the network. To allow communication flow between these previously isolated parts of the business the network
The correct answer is B. Configure the redistribution statement with the subnets keyword under the R2 OSPF configuration. When redistributing routes into OSPF using the 'redistribute' command, OSPF by default only redistributes classful (major network) routes and ignores subnets. The 'subnets' keyword must be explicitly added to the redistribution statement to allow OSPF to also redistribute subnett
Question
Refer to the exhibit. A company has been running OSPF and EIGRP on two separate portions of the network. To allow communication flow between these previously isolated parts of the business the networking team just configured R2 to mutually redistribute routes between EIGRP and OSPF R3 has the OSPF routes in its routing table but R1 is failing to receive EIGRP routes for the link between R2 and R3. Which action must the team take to resolve the issue?
Exhibit
Options
- AConfigure EIGRP on R1
- BConfigure the redistribution statement with the subnets keyword under the R2 OSPF configuration
- CConfigure a virtual link between R1 and R2 to handle traffic without an assigned area
- DConfigure R1 with a static route with the next hop set to R3 with the vrf keyword to avoid the
How the community answered
(28 responses)- A7% (2)
- B75% (21)
- C14% (4)
- D4% (1)
Explanation
When redistributing routes into OSPF using the 'redistribute' command, OSPF by default only redistributes classful (major network) routes and ignores subnets. The 'subnets' keyword must be explicitly added to the redistribution statement to allow OSPF to also redistribute subnetted (classless) routes. In this scenario, the link between R2 and R3 is almost certainly a subnetted address (e.g., /30), which OSPF is silently dropping without the 'subnets' keyword, preventing R1 from learning that route. The fix is to change the OSPF redistribution on R2 to include 'subnets': 'redistribute eigrp [AS] metric [value] subnets'. Option A is wrong because adding EIGRP on R1 does not fix the redistribution gap - R1 is connected to R2 via OSPF. Option C (virtual link) addresses OSPF area contiguity, not redistribution filtering. Option D (static route with VRF) is irrelevant to this redistribution problem.
Topics
Community Discussion
No community discussion yet for this question.