Discuss HP HPE7-A01 Exam Topic 7 Question 43

Which statements are true about VSX LAG? (Select two.)

AThe total number of configured links may not exceed 8 for the pair or 4 per switch

BOutgoing traffic is switched to a port based on a hashing algorithm which may be either switch in the pair

CLAG traffic is passed over VSX ISL links only while upgrading firmware on the switch pair

DOutgoing traffic is preferentially switched to local members of the LAG.

EUp to 255 VSX lags can be configured on all 83xx and 84xx model switches.

Suggested Answer: A, D

The correct answers are A and D.

According to the web search results, VSX LAG is a feature that allows multiple PSKs to be used on a single SSID, providing device-specific or group-specific passphrases for enhanced security and deployment flexibility for headless IoT devices1. VSX LAGs span both aggregation switches and appear as one device to partner downstream or upstream devices or both when forming a LAG with the VSX pair2.

One of the statements that is true about VSX LAG is that the total number of configured links may not exceed 8 for the pair or 4 per switch1. This means that a VSX LAG across a downstream switch can have at most a total of eight member links, and a switch can have a maximum of four member links. When creating a VSX LAG, it is recommended to select an equal number of member links in each segment for load balancing1.

Another statement that is true about VSX LAG is that outgoing traffic is preferentially switched to local members of the LAG2. This means that when active forwarding and active gateway are enabled, north-south and south-north traffic bypasses the ISL link and uses the local ports on the switch. This optimizes the traffic path and reduces the load on the ISL link2.

The other statements are false or not relevant for VSX LAG. Outgoing traffic is not switched to a port based on a hashing algorithm, which may be either switch in the pair. This is a characteristic of MLAG (Multi-Chassis Link Aggregation), which is a different feature from VSX LAG. LAG traffic is not passed over VSX ISL links only while upgrading firmware on the switch pair. This is a scenario that may occur when performing hitless upgrades, which is a feature that allows software updates without impacting network availability. The number of VSX lags that can be configured on all 83xx and 84xx model switches is not 255, but depends on the switch model and firmware version. For example, the AOS-CX 10.04 supports up to 64 VSX lags for 8320 switches and up to 128 VSX lags for 8325 and 8400 switches.

Get Premium HPE7-A01 Questions as Interactive Web-Based Practice Test or PDF Real Exam Format Detailed Explanations Instant Access Get Your Practice Test

26 comments · newest first

Ashton 10 months ago

E seems too high, are we really allowed that many LAGs?

Cherry 10 months ago

D makes sense, local traffic should be prioritized.

Kristofer 10 months ago

A is definitely true, can't exceed those limits.

Vicky 11 months ago

Wait, C sounds off. LAG should be active all the time, right?

Freeman 11 months ago

I think B is correct too, hashing is key for traffic.

Cassie 11 months ago

I feel like I saw something about the maximum number of VSX LAGs in a study guide, and option E might be true, but I can't recall the specifics.

Avery 11 months ago

I'm a bit confused about option C; I thought LAG traffic was always active, not just during firmware upgrades.

Jodi 12 months ago

I remember practicing a question about traffic distribution in LAGs, and I think option D might be correct since local members usually get priority.

Jamie 12 months ago

I think option A sounds familiar, but I'm not entirely sure about the exact limits for the links in a VSX LAG.

Judy 12 months ago

Alright, I've got a good handle on how VSX LAG works. I think I can identify the two true statements here.

Bulah 1 year ago

Ah, this is a tricky one. I'm not sure about the details on upgrading firmware and the number of VSX LAGs that can be configured. I'll have to guess on a couple of these.

Alpha 1 year ago

Okay, let's see. The key things I'm looking for are the limits on the number of configured links and how the traffic is switched. I think I can narrow it down from there.

Donte 1 year ago

Hmm, I'm not too familiar with VSX LAG. I'll need to read through the options carefully to try to figure this out.

Leslie 1 year ago

This question seems pretty straightforward. I think I can handle this one.

Letha 1 year ago

Wait, we're supposed to select two answers? I thought this was a multiple-choice question. Well, I guess A and D it is, then.

Reena 1 year ago

↳ replying to Letha

D) Outgoing traffic is preferentially switched to local members of the LAG.

Amira 1 year ago

↳ replying to Letha

A) The total number of configured links may not exceed 8 for the pair or 4 per switch

Arlene 1 year ago

I'm not sure about C, but I think E could also be true.

Sophia 1 year ago

I agree with Cherelle, A and D make sense.

Salena 1 year ago

Hashing algorithm? Switching based on that? Sounds like a bunch of techno-mumbo-jumbo to me. I'll stick with A and D.

Justine 1 year ago

E? 255 VSX lags? That's a bit excessive, don't you think? I'll go with A and D.

Ressie 1 year ago

A and D are the correct answers. The total number of configured links can be up to 8 for the pair, and outgoing traffic is preferentially switched to local members of the LAG.

Lawana 1 year ago

↳ replying to Ressie

Outgoing traffic is preferentially switched to local members of the LAG.

Lizette 1 year ago

↳ replying to Ressie

The total number of configured links can be up to 8 for the pair.

Pok 1 year ago

↳ replying to Ressie

A and D are the correct answers.

Cherelle 1 year ago

I think A and D are true.

HPE7-A01 Exam - Topic 7 Question 43 Discussion