300-620 · Question #191
Refer to the exhibit. VM1 and VM2 are in Cisco ACI POD1 and communication takes place. Which event is triggered when VM2 is live migrated from POD1 to POD2?
The correct answer is D. An MP-BGP EVPN update is received by spines in POD1 announcing the reachability of VM2 via. When a VM is live migrated between Cisco ACI pods, the ACI control plane uses MP-BGP EVPN updates to signal the VM's new location throughout the fabric.
Question
Refer to the exhibit. VM1 and VM2 are in Cisco ACI POD1 and communication takes place. Which event is triggered when VM2 is live migrated from POD1 to POD2?
Exhibit
Options
- ALeaf 102 installs a bounce entry for VM2 pointing to the PTEP address of leaf 201.
- BLeaf 201 creates a tunnel with leaf 102 because of the bounced traffic that is destined to VM2.
- CSpines from POD2 send an MP-BGP EVPN update to the leaves in POD1 about the new location
- DAn MP-BGP EVPN update is received by spines in POD1 announcing the reachability of VM2 via
How the community answered
(47 responses)- A6% (3)
- B4% (2)
- C17% (8)
- D72% (34)
Why each option
When a VM is live migrated between Cisco ACI pods, the ACI control plane uses MP-BGP EVPN updates to signal the VM's new location throughout the fabric.
A bounce entry is typically used for MAC moves within a single pod to temporarily redirect traffic, but for inter-pod mobility, the MP-BGP EVPN control plane is the primary mechanism for location updates.
Leaf 201 will learn the VM and announce its presence; tunnels are created for data forwarding based on learned reachability, not directly because of 'bounced' traffic from a remote pod.
Spines send MP-BGP EVPN updates to other spines, not directly to remote leaves; the remote spines then distribute this information to their connected leaves.
Upon VM2's migration to POD2, the new leaf in POD2 learns its presence and informs its local spine. This spine then originates an MP-BGP EVPN update across the Inter-Pod Network (IPN) to all other spines, including those in POD1, announcing that VM2 is now reachable via the TEPs of POD2.
Concept tested: Cisco ACI Multi-Pod VM mobility
Source: https://www.cisco.com/c/en/us/td/docs/dcn/aci/apic/5x/multi-pod/cisco-aci-multi-pod-config-guide-501/m_multi-pod_vm_mobility.html
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