Achieving Scalability with RSVP LSPs in a Full Mesh Topology
Question
You are designing a new MPLS network that contains 1000 nodes. To provide for any-to-any connectivity for your customer base, you have decided to build a full mesh of RSVP LSPs. You are concerned with scalability of the overall network and with the resources used by the devices. Which RSVP feature is used to accomplish your design goals.
Answers
Explanations
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A. B. C. D.D
The RSVP refresh reduction, based on RFC 2961, addresses the problem of scalability and reliability that result from relying on periodic refresh messages.
The RSVP (Resource Reservation Protocol) is a protocol used to reserve network resources for specific traffic flows in an IP network, particularly in MPLS networks. In a full-mesh network, each node needs to have a direct RSVP LSP (Label Switched Path) connection to every other node in the network. However, building a full mesh of RSVP LSPs can be resource-intensive, particularly in large networks.
To address the scalability concerns, RSVP uses the "refresh reduction" feature. RSVP messages are used to establish and maintain LSPs between nodes in the network. RSVP messages are sent periodically to refresh the state of the LSPs. However, in a large network with many nodes, the number of refresh messages can quickly become overwhelming and put a strain on network resources.
The refresh reduction feature allows RSVP to optimize the use of network resources by reducing the number of refresh messages that need to be sent. RSVP achieves this by only sending refresh messages when there is a change in the state of the LSP, rather than sending refresh messages periodically. This reduces the number of RSVP messages that need to be sent, which reduces the overall resource utilization of the network.
Therefore, the correct answer to the question is D) refresh reduction. The refresh reduction feature is used to ensure scalability and efficient use of network resources when building a full mesh of RSVP LSPs in a large network.
