A service provider is running a single-area OSPFv2 interface in the MPLS network.
The OSPF reconvergence time is becoming excessively slow as the service provider MPLS grows.
Which two actions can improve network performance without implementing a multiarea design? (Choose two.)
Click on the arrows to vote for the correct answer
A. B. C. D. E.BC.
The OSPF reconvergence time becomes slower as the network grows because more network changes require the entire SPF algorithm to run, leading to slower convergence times. A multiarea design can help by reducing the size of each area, but the question asks for solutions that do not involve implementing a multiarea design.
A. Implement Partial Route Computation: This technique allows an OSPF router to compute only part of the routing table, rather than the entire routing table, which can reduce the CPU overhead and speed up convergence time. However, it requires support from all routers in the network, which may not be feasible in some cases.
B. Enable LSA group pacing: LSA group pacing allows OSPF routers to pace the flooding of LSAs to prevent the network from being overwhelmed with too many LSAs at once. This can help reduce the CPU and memory overhead on OSPF routers, which can speed up convergence time.
C. Configure incremental SPF: Incremental SPF is a technique that allows an OSPF router to recalculate only the affected routes when a network change occurs, rather than the entire routing table. This can help reduce the CPU overhead and speed up convergence time, but it requires support from all routers in the network, which may not be feasible in some cases.
D. Reduce type 5 LSAs: Type 5 LSAs are generated by ASBRs and can cause significant network overhead, which can slow down OSPF convergence time. However, reducing type 5 LSAs may not be feasible in some cases, and it may not be enough to significantly speed up convergence time.
E. Limit the number of TLVs: TLVs (Type-Length-Value) are used in OSPF to carry additional information beyond the basic LSA structure. Limiting the number of TLVs can reduce the size of LSAs, which can help reduce network overhead and speed up OSPF convergence time. However, this may not be feasible in some cases, and it may not be enough to significantly speed up convergence time.
Based on the above analysis, the two actions that can improve network performance without implementing a multiarea design are B. enable LSA group pacing and C. configure incremental SPF.