A router running ISIS is showing high CPU and bandwidth utilization.
An engineer discovers that the router is configured as L1/L2 and has L1 and L2 neighbors.
Which step optimizes the design to address the issue?
Click on the arrows to vote for the correct answer
A. B. C. D.D.
ISIS (Intermediate System to Intermediate System) is a link-state protocol that is used for routing within large networks. It divides the network into areas, which are used to reduce the number of updates and the size of the routing table. Each area has a designated router called a DIS (Designated Intermediate System) that is responsible for forwarding link-state updates.
In this scenario, a router running ISIS is experiencing high CPU and bandwidth utilization. The engineer discovers that the router is configured as L1/L2 and has L1 and L2 neighbors. This means that the router is configured to participate in both level 1 and level 2 routing.
To optimize the design and address the issue, one of the following steps can be taken:
A. Make this router a DIS for each of the interfaces Designating the router as a DIS for each of the interfaces may help to reduce the CPU and bandwidth utilization, as it allows the router to handle and forward the link-state updates for its attached networks. However, this step may not solve the problem entirely, as the root cause of the issue is not clear.
B. Disable the default behavior of advertising the default route on the L1/L2 router By default, an L1/L2 router advertises the default route to all its neighbors. Disabling this default behavior may help to reduce the CPU and bandwidth utilization, as the router will not advertise unnecessary information. This step may be effective in addressing the issue.
C. Configure the router to be either L1 or L2 Configuring the router to be either L1 or L2 may also help to reduce the CPU and bandwidth utilization, as the router will only participate in one level of routing. However, this step may not be feasible, as the router may need to participate in both levels of routing depending on the network topology.
D. Configure each interface as either L1 or L2 circuit type. Configuring each interface as either L1 or L2 circuit type may also help to optimize the design and address the issue. This allows the router to participate in only one level of routing on each interface, which can reduce the CPU and bandwidth utilization. However, this step may also not be feasible in some cases, as it depends on the network topology and requirements.
In conclusion, option B is the most effective step to optimize the design and address the high CPU and bandwidth utilization issue in this scenario. However, depending on the network topology and requirements, any of the above steps may be necessary.