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?
A.
Leaf 102 installs a bounce entry for VM2 pointing to the PTEP address of leaf 201.
B.
Leaf 201 creates a tunnel with leaf 102 because of the bounced traffic that is destined to VM2.
C.
Spines from POD2 send an MP-BGP EVPN update to the leaves in POD1 about the new location of VM2.
D.
An MP-BGP EVPN update is received by spines in POD1 announcing the reachability of VM2 via the proxy VTEP address of the spines in POD2.
Figure 39 Live Migration across Pods
https://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/application-centric-infrastructure/white-paper-c11-737855.html#LiveWorkloadMigrationAcrossPods
C -
pod1 spine had stale record.
Live Migration across Pods
1. The VM migrates between Pod1 and Pod2.
2. Once the migration is completed, the leaf node in Pod2 discovers EP2 as locally connected and sends a COOP update message to the local spines.
3. The spine node that receive the COOP message updates EP2’s info in the COOP database, replicates the information to the other local spines and sends a MP-BGP EVPN update to the spines in remote Pods.
4. The spines in the remote Pods receive the EVPN update and add the information to the local COOP database that EP2 is now reachable via the Proxy VTEP address identifying the spines in Pod2 (“Proxy B”).
5. The spine sends a control plane message to Leaf 4 as it was the old known location for EP2. Leaf 4 as a consequence installs a bounce entry for EP2 pointing to the local spines Proxy VTEP address.
https://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/application-centric-infrastructure/white-paper-c11-737855.html
It is D. Answer "C" states that Spines send the update to leaves, well the update is sent to the COOP DB, and the COOP DB resides on the spines.
D is the most logical answer, Spines on POD 1 receive the update from Spines on POD 2, simple as that.
There all true!
https://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/application-centric-infrastructure/white-paper-c11-737855.html
I would say C, because from D I do not agree with "via the proxy VTEP address of the spines in POD2", the MP-BGP update should announce VM2 reachable from the VTEP address of leaf 201.
This question is buged. And if multi-pod live migration is happening, VM would migrate to new pod site, and notify via COOP the local SPINE. Local SPINE would then send the newly learned endpoint via MP-BGP EVPN to the other POD and Leaf on other pod would install Bounce entries pointing to the other pod spine.. Answer would be D if the question is clear.
upvoted 4 times
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