correct answer is C
reference:
https://www.cisco.com/c/en/us/support/docs/switches/nexus-9000-series-switches/118978-config-vxlan-00.html#anc7
and
https://blogs.cisco.com/datacenter/detecting-and-mitigating-loops-in-vxlan-networks
C makes most sense. VXLAN is leveraging multicast to flood broadcast. And STP is normally no longer needed.
D. can reduces STP, but I don't see the multicast link...
sorry guys, changed my mind to C
I wasn't thinking of it like I should, by leveraging VXLAN we are decreasing the L2 underlay by forwarding L2 traffic over L3 underlay .. which will lead to less STP
i'm going with D not 100% sure but my explanation is:
if you have 3 switches with circle connections, this way you will have 1 Spanning-Tree. using VXLAN will not make it 0
but if you use VSS: 2 of the switches will act and function as 1 device, which result in a topology that contain virtually just 2 switches with 0 STP.
sorry guys, changed my mind to C
I wasn't thinking of it like I should, by leveraging VXLAN we are decreasing the L2 underlay by forwarding L2 traffic over L3 underlay .. which will lead to less STP
VXLAN, multicast used to flood L2 traffic such as ARP. VXLAN eliminates the need for a spanning tree, using a MAC over IP/UDP solution. So, within the VXLAN no STP, reducing it overall in the entire network ...
Well, I am going with D because the question is about "reducing" the STP while VXLAN eliminates it at all. MC is supported by both I believe. As always - who knows what Cisco had in mind?
VXLAN encapsulates l2 frames and sends them over a layer 3 underlay network. Since the underlay is layer 3, you can easily use:
- layer 3 at all layers (core, distribution, access)
- layer 3 between spine and leaf layers in datacenter designs (afaik, layer 3 is the requirement to implement spine leaf)
- Cisco SD Access uses VXLAN as the Data Plane protocol, and requires a layer 3 underlay.
Since you have layer 3 everywhere, there can't be any layer 2 loops, therefore STP is gone.
Now, to answer your question, VXLAN doesn;t stop a packet from looping, but there are no more l2 loops, only l3 loops and the IGP will take care of them.
VXLAN allows you to have layer 3 everywhere which means there's no need for STP.
Does VSS leverage multicast? Or in other words, does it need multicast for VSS to function? I doubt it. VXLAN does though. It can use multicast to handle BUM traffic.
Ofcourse yes because VXLAN underlay is routed based and do not use STP....
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