Which of the following statements about LDP label distribution control modes is incorrect?

Which of the following statements about LDP label distribution control modes is incorrect?

• A. LDP label distribution can be controlled in ordered mode
• B. In ordered mode, an LSR sends label mapping messages to upstream routers
• C. LDP label distribution cannot be controlled in independent mode
• D. In independent mode, an LSR can send label messages any time

Answer: (C)

In the context of LDP (Label Distribution Protocol) label distribution control modes, understanding each mode's characteristics is essential. LDP operates in different control modes, primarily ordered mode and independent mode. Ordered mode ensures that an LSR (Label Switch Router) sends label mapping messages to its upstream routers in a systematic way. This approach aids in maintaining the sequence of label assignments, which can be crucial for maintaining traffic engineering or service quality. In independent mode, however, an LSR has flexibility in sending label mapping messages. It does not require synchronization with its upstream routers as it can send these messages at any time. This mode allows for a more dynamic distribution of labels, making it suitable for various network conditions where immediate label allocation is beneficial. The assertion that LDP label distribution cannot be controlled in independent mode is incorrect because independent mode is explicitly designed to allow LSRs to manage label distribution autonomously, without the need for waiting for coordination with upstream routers. This flexibility is a defining feature of independent mode, contrasting with the structured approach of ordered mode. By recognizing this distinction, it becomes clear that independent mode does indeed exist and is an integral part of the LDP label distribution control mechanisms.

In the context of LDP (Label Distribution Protocol) label distribution control modes, understanding each mode's characteristics is essential.

LDP operates in different control modes, primarily ordered mode and independent mode. Ordered mode ensures that an LSR (Label Switch Router) sends label mapping messages to its upstream routers in a systematic way. This approach aids in maintaining the sequence of label assignments, which can be crucial for maintaining traffic engineering or service quality.

In independent mode, however, an LSR has flexibility in sending label mapping messages. It does not require synchronization with its upstream routers as it can send these messages at any time. This mode allows for a more dynamic distribution of labels, making it suitable for various network conditions where immediate label allocation is beneficial.

The assertion that LDP label distribution cannot be controlled in independent mode is incorrect because independent mode is explicitly designed to allow LSRs to manage label distribution autonomously, without the need for waiting for coordination with upstream routers. This flexibility is a defining feature of independent mode, contrasting with the structured approach of ordered mode.

By recognizing this distinction, it becomes clear that independent mode does indeed exist and is an integral part of the LDP label distribution control mechanisms.