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Question 51 - NCP-MCI-6.5 discussion

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Refer to the exhibit.

An administrator is adding a new node to a cluster. The node has been imaged to the same versions of AHV and AOS that the cluster running, configured with appropriate IP addresses, and br0-up has been configured the same the existing uplink bonds

When attempting to add the node to the cluster with the Expand Cluster function in Prism , the cluster is unable to find the new node.

Based on the above output from the new node, what is most likely the cause of this issue?

A.
The ports on the upstream switch are not configured for LACP.
Answers
A.
The ports on the upstream switch are not configured for LACP.
B.
The existing and the expansion node are on different VLANs.
Answers
B.
The existing and the expansion node are on different VLANs.
C.
There is a firewall blocking the discovery traffic from the tlu
Answers
C.
There is a firewall blocking the discovery traffic from the tlu
D.
LACP configuration must be completed after cluster expansion
Answers
D.
LACP configuration must be completed after cluster expansion
Suggested answer: B

Explanation:

The correct answer is B. The existing and the expansion node are on different VLANs.

The output shows that the new node has a br0-up bond with four interfaces: eth0, eth1, eth2, and eth3. The bond is configured with LACP active and LACP fallback set to false. This means that the bond will only work if the upstream switch supports LACP and is configured to form an LACP group with the four interfaces. However, the output also shows that the bond has no IP address assigned to it, which indicates that the bond is not operational. One possible reason for this is that the existing and the expansion node are on different VLANs, and the upstream switch is not configured to allow the VLAN traffic on the LACP group. This would prevent the new node from communicating with the cluster and being discovered by the Expand Cluster function in Prism.

To verify this, the administrator can check the VLAN configuration on the upstream switch and compare it with the existing nodes. Alternatively, the administrator can use the ''manage_ovs show_uplinks'' command on an existing node and compare the output with the new node. If there is a VLAN mismatch, the administrator can either change the VLAN configuration on the switch or on the new node to match the existing nodes.

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asked 23/09/2024
Jeffrey Agnitsch
40 questions
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