RSVP-Signaled LSP and Local Router Actions
Question
An established RSVP-signaled LSP suffers a link failure.
What is one action taken by the local RSVP-enabled router?
Answers
Explanations
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A. B. C. D.A
When an established RSVP-signaled LSP (Label Switched Path) experiences a link failure, the local RSVP-enabled router will take certain actions to handle the failure. RSVP (Resource Reservation Protocol) is a protocol that is used to reserve resources along a path to ensure quality of service (QoS) for certain applications that require it.
In this scenario, the link failure could cause a break in the LSP, which could disrupt the application that is using it. The local RSVP-enabled router needs to take action to resolve the issue and ensure that the LSP continues to function as expected.
There are two types of messages that can be sent in response to a link failure: ResvErr and ResvTear.
ResvErr message: This message is sent upstream from the failure point to the previous hop. The ResvErr message is used to indicate that the LSP cannot be continued due to the failure of the link. The previous hop will then send a PathTear message downstream to tear down the LSP.
ResvTear message: This message is sent downstream from the failure point to the next hop. The ResvTear message is used to tear down the LSP at the point of failure. The next hop will then send a PathErr message upstream to indicate that the LSP could not be continued.
Therefore, the correct answer to the question is option A: A ResvTear message is sent downstream. When the local RSVP-enabled router detects a link failure, it will send a ResvTear message downstream to tear down the LSP at the point of failure. The next hop will then send a PathErr message upstream to indicate that the LSP could not be continued.
