LDP Router Configuration Outcome
Question
In your network, you have two LDP routers connected across four physical interfaces. You have also enabled LDP to operate on all four of those interfaces.
What is the resulting outcome of your configuration between those two routers?
Answers
Explanations
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A. B. C. D.B
LDP (Label Distribution Protocol) is used to distribute labels for forwarding packets in MPLS (Multiprotocol Label Switching) networks. In a typical LDP configuration, Label Switching Routers (LSRs) use LDP to establish a neighbor relationship with other LSRs to exchange label information.
In the given scenario, two LDP routers are connected across four physical interfaces, and LDP is enabled on all four interfaces. This means that each router has two physical interfaces connected to the other router.
To determine the resulting outcome of this configuration, we need to understand how LDP establishes neighbor relationships and sessions.
When two LDP routers discover each other, they establish a neighbor relationship. LDP uses the Hello protocol to discover neighbors and determine their capabilities. After the capabilities are exchanged, the routers exchange label information and establish a session. A session is a logical connection between two LDP routers that allows them to exchange label information.
In this case, there are two physical interfaces on each router, and LDP is enabled on all four interfaces. Therefore, each router can potentially establish a neighbor relationship and a session with each of the other router's physical interfaces. This means that there can be a total of four neighbor relationships and four sessions between the two routers.
Therefore, the correct answer is D - four sessions are built across four neighbor relationships.
