Discuss Cisco 300-620 Exam Topic 3 Question 115

When does the Cisco ACI leaf learn a source IP or MAC as a remote endpoint?

AWhen VXLAN traffic arrives on a leaf fabric port from the spine and outer source IP is in the Layer 3 Out EPG subnet range.

BWhen VXLAN traffic arrives on a leaf fabric port from the spine and outer source IP is in the bridge domain subnets range.

CWhen VXLAN traffic arrives on a leaf fabric port from the spine and inner source IP is in the Layer 3 Out EPG subnet range.

DWhen VXLAN traffic arrives on a leaf fabric port from the spine and inner source IP is in the bridge domain subnets range.

Suggested Answer: D

In Cisco ACI, a leaf switch learns a source IP or MAC as a remote endpoint when VXLAN traffic arrives on a leaf fabric port from the spine, and the inner source IP is within the range of the bridge domain subnets associated with the leaf. This process is part of the ACI's COOP (Council Of Oracles Protocol), which ensures that endpoint information is accurately disseminated across the fabric for efficient traffic forwarding.

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23 comments · newest first

Cristen 2 days ago

D is confusing. Why would inner IP matter for learning?

Margart 7 days ago

C seems plausible, but I’m not sure about the inner source IP.

Thad 12 days ago

I lean towards A as well. It’s clear and straightforward.

Kirby 17 days ago

What about B? Bridge domain subnets could be relevant.

Vanna 22 days ago

I feel A is correct too. It aligns with how endpoints are learned.

Raina 27 days ago

I think it's A. Makes sense with Layer 3 Out EPG.

Salena 1 month ago

I see the logic in B. Bridge domains are vital in ACI.

Na 1 month ago

A is clear. EPG subnet range is essential for learning.

Sonia 1 month ago

D could be valid, but I still favor A.

Royal 2 months ago

I lean towards C. Inner source IP is important too.

Lizette 2 months ago

B is more accurate. Bridge domain is where it starts.

Chan 2 months ago

A feels right. The outer source IP is key.

Ilene 2 months ago

I prefer B. Bridge domain subnets are crucial here.

Marg 2 months ago

I think it's A. It makes sense with Layer 3 Out EPG.

Luisa 2 months ago

I disagree, I think it’s C. The inner IP is key here.

Elroy 3 months ago

Wait, so it doesn't learn from the Layer 3 Out? That’s surprising!

Tamala 3 months ago

Definitely B! Makes sense for bridge domains.

Roselle 3 months ago

I thought it was A, but now I'm not so sure.

Cortney 3 months ago

It's B, right? That's when it learns the MAC!

Kris 3 months ago

I thought it was option A because it specifically mentions the Layer 3 Out EPG, but I could be mixing it up with another topic we covered.

Cherri 3 months ago

I'm a bit confused about the inner and outer IPs here. I feel like it could be option D since it mentions the bridge domain, but I need to double-check my notes.

Lenny 4 months ago

I remember practicing a question similar to this, and I think it was about the bridge domain subnets. So maybe it's option B?

Leigha 4 months ago

I think the leaf learns the source IP when the outer source IP is in the Layer 3 Out EPG subnet range, but I'm not entirely sure if that's A or B.

Cisco 300-620 Exam - Topic 3 Question 115 Discussion