Cisco Exam 300-410 Topic 10 Question 89 Discussion

Actual exam question for Cisco's 300-410 exam

Question #: 89
Topic #: 10

Refer to the exhibit.

An engineer configured IP SLA to monitor a next hop on a router for reachability When the next hop is unreachable, the router is executing tracking and failing over another route, but packet loss is experienced because the reachability is flapping. Which action resolves the issue?

AAppend delay up 0 down Ovto the track command

BIncrease the timeout of the sla probe to 6000

CAppend delay up SO down 60vto the track command

DIncrease the frequency of the sla probe to 60.

Show Suggested Answer

Suggested Answer: C

IP SLA (Internet Protocol Service Level Agreement) is a feature that allows you to measure network performance such as latency, jitter, packet loss, and so on.In this case, it's being used to monitor the reachability of a next hop on a router123.

When the next hop is unreachable, the router is executing tracking and failing over to another route. However, packet loss is experienced because the reachability is flapping. This could be due to the router switching back and forth between the primary and backup routes too quickly.

To resolve this issue, you can introduce a delay in the tracking process. This can be done by appending a delay to the track command.Option C suggests appending a delay of 50 seconds for the up state and 60 seconds for the down state45. This means that the router will wait for 50 seconds before declaring the tracked object as up (reachable) and 60 seconds before declaring it as down (unreachable).This delay can help prevent the router from switching routes too quickly, thus reducing the chances of reachability flapping and packet loss45.

Configure ISP Failover with Default Routes Using IP SLA Tracking - Cisco

Using IPSLA to change routing - Cisco Community

How to Use IP SLA Technology to Assess WAN Performance

Reliable Static Routing with IP SLA - NetworkLessons.com

Configuring Static Route Tracking using IP SLA (Basic)

by Buck at May 23, 2024, 02:45 PM

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Rosendo

6 months ago

Alright, let's get serious here. I'm going with option C. Delay up and down should do the trick and keep those packets flowing smoothly. Now, can we move on to the next question? I'm starting to feel like I'm back in networking 101.

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Nenita

6 months ago

Whoa, hold up! Is this an IP SLA exam or a joke contest? Seriously, though, I'd go with option B. Increasing the timeout seems like the most straightforward way to smooth out the flapping.

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Pamella

5 months ago

Yeah, increasing the timeout of the sla probe should help stabilize the reachability.

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Shenika

5 months ago

I agree, option B does seem like the most logical choice to fix the flapping issue.

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Ilda

5 months ago

I agree, option B seems like the most logical choice to prevent the flapping issue.

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Hui

6 months ago

Option B sounds like a good idea. Increasing the timeout could help stabilize the reachability.

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Filiberto

6 months ago

I think option B is the safer bet, it directly addresses the issue of flapping reachability.

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Delmy

6 months ago

But wouldn't increasing the frequency of the sla probe to 60 also help in this situation?

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Nell

6 months ago

I agree, option B does seem like the most logical choice here.

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Cortney

7 months ago

Why not just crank up the frequency of the SLA probe to 60? That'll give the router a better chance of catching the issue before it becomes a problem. Seems like the easiest solution to me.

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Kip

6 months ago

Yeah, that should help catch the issue before it causes packet loss.

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Nichelle

6 months ago

I think increasing the frequency of the SLA probe to 60 is the best option.

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Noah

7 months ago

Option C looks like the way to go. Appending the delay up and down parameters to the track command should help stabilize the flapping behavior.

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Tequila

7 months ago

I think the issue can be resolved by increasing the timeout of the SLA probe to 6000. That should give the router enough time to detect the issue and failover without experiencing packet loss.

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