Which command configures an LLDP delay time of 5 seconds?

200-301 By islever Editorial Last updated

Configure and verify Layer 2 discovery protocols (Cisco Discovery Protocol and LLDP)

Short answer

D Enter the lldp reinit 5 command to configure a 5-second LLDP reinitialization delay.

Question

Which command should you enter to configure an LLDP delay time of 5 seconds?
  1. lldp timer 5000
  2. lldp holdtime 5
  3. lldp reinit 5000
  4. lldp reinit 5 Correct Answer

Key Takeaways

The LLDP reinitialization delay is configured using the 'lldp reinit' command, which sets the delay in seconds before LLDP initializes on an interface.

Identify the correct Cisco IOS command to configure the LLDP reinitialization delay time. This guide clarifies why the 'lldp reinit' command is used to set the delay instead of the holdtime or timer.

Common mistake: Choosing 'lldp holdtime 5' (Option B) by confusing the holdtime (TTL for received information) with the reinitialization delay.

Expert Analysis

Why the Answer Is Correct

The lldp reinit command is specifically used to configure the delay time, in seconds, before LLDP initializes on any interface. Setting this to 5 seconds requires the command lldp reinit 5, making option D correct. This delay applies when LLDP is disabled and then re-enabled on an interface.

Why the Other Options Are Wrong

Option A (lldp timer 5000) sets the packet transmission interval, not the delay, and uses an invalid large value. Option B (lldp holdtime 5) configures the TTL for how long receiving devices hold LLDP information, which is a retention period, not a delay. Option C (lldp reinit 5000) uses the correct keyword but an invalid value, as the reinit delay is configured in seconds (1-10), not milliseconds.

Community Comment Notes

Several users pointed out that lldp reinit sets the initialization delay, as Tompoo noted, "The lldp reinit command specifies the delay, in seconds, before LLDP initializes on an interface." xtraMiles correctly argued against the holdtime option, stating "I don't consider hold time as being a delay in this case. If anything, it is a form of retention". Dutch012 mistakenly thought "delay time" referred to holdtime unless "initialize" was explicitly stated, but Cisco's syntax explicitly defines reinit as the delay.

Exam Strategy

Know the exact syntax and purpose of the three main LLDP global configuration commands: 'timer' (update interval), 'holdtime' (TTL), and 'reinit' (initialization delay). Remember that 'reinit' and 'timer' are in seconds, not milliseconds.

Discussion 9 contributions

Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.

From public community threads 9

  1. Dutch012 👍 10 Answered B
    I guess the guys in the comment misunderstand the question. if it said Which command is used to specify the delay time of 5 seconds for LLDP to initialize on any interface? the answer would be D. but if the question was (which is in our case) Which command should you enter to configure an LLDP delay time of 5 seconds? the answer would be B.
  2. dearc 👍 7 Answered D
    The correct answer to the question "Which command should you enter to configure an LLDP delay time of 5 seconds?" is D. lldp reinit 5. Explanation : LLDP (Link Layer Discovery Protocol) is a network protocol used to discover network devices and their properties. The lldp reinit command is used to set the delay time for reinitializing LLDP information after an interface has gone down and come back up. By default, this delay time is set to 2 seconds. To configure it to 5 seconds, you would enter the command lldp reinit 5. Option A, lldp timer 5000, sets the interval at which LLDP packets are sent, measured in seconds. Option B, lldp holdtime 5, sets the amount of time a device should retain information received from its neighbors before discarding it, measured in seconds. Option C, lldp reinit 5000, sets the delay time for reinitializing LLDP information, but the value is in milliseconds, not seconds. Therefore, the correct answer is D, lldp reinit 5.
  3. dropspablo 👍 4
    lldp hold time in 5 second? Per default is 120 second (4 lldp timer). Lldp reinit per default is 2s, can you set between 1 an 10 seconds. I believe answer is D. lldp reinit 5.
  4. Iamm 👍 3 Answered D
    Correct answer
  5. xtraMiles 👍 2 Answered D
    I would have picked B if the word "delay" in the question was followed by the phrase "before discarding". The thing is, I don't consider hold time as being a delay in this case. If anything, it is a form of retention (holding on to it no matter how short). You can shorten the hold time to 5 seconds, sure, but it's not delaying anything. You're actually advancing the clock by speeding up the process and telling the protocol to hurry up and discard that 5 second-old record.
Show 4 more comments
  1. sol_ls95 👍 2 Answered D
    d correct answer
  2. iMo7ed 👍 2 Answered D
    it's D
  3. Tompoo 👍 1 Answered D
    The question asks for an LLDP delay time of 5 seconds. The Cisco IOS command that controls the LLDP reinitialization delay is: Switch(config)# lldp reinit 5 The lldp reinit command specifies the delay, in seconds, before LLDP initializes on an interface.
  4. nzieno 👍 1
    Answer is D. reinit Delay (in sec) for LLDP initialization on any interface

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