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A UCS administrator connects Fabric Interconnect A’s Layer 1 and Layer 2 high availability ports to Fabric Interconnect B’s Layer 1 and Layer 2 high availability ports. In addition, the administrator connects each Fabric Interconnect’s Mgmt 0 port to a switch. No FC connections have been made between Fabric Interconnect A and Fabric Interconnect B.
Which of the following statements about the Fabric Interconnect cluster is true?
- Failover will not work, because no FC connections have been made.
- Failover will not work, because no Ethernet connections have been made.
- Failover will work, but there will be no link-level redundancy.
- Failover will work, and link-level redundancy is available.
Explanation:
Cisco Unified Computing System (UCS) Fabric Interconnect failover will work, and link-level redundancy is available. In this scenario, the UCS administrator connects two Cisco Fabric Interconnects, A and B, together by using each device’s Layer 1 and Layer 2 high availability ports. This configuration is known as a Fabric Interconnect cluster.
Each Fabric Interconnect in a cluster is capable of monitoring the status of the Fabric Interconnect to which it is connected. If Fabric Interconnect A fails, Fabric Interconnect B can take over the duties of Fabric Interconnect A. If Fabric Interconnect B fails, Fabric Interconnect A can take over the duties of Fabric Interconnect B.
Link-level redundancy is available in this scenario because the Mgmt 0 port on each Fabric Interconnect has been connected to a switch. In a Fabric Interconnect cluster, it is possible to connect only one device’s Mgmt 0 port to a switch to enable management of the entire cluster. However, the connection of both Mgmt 0 ports ensures redundancy in case of failure of one of the devices.
Failover will work even though there are no Fibre Channel (FC) connections between the devices in this scenario. A Fabric Interconnect cluster requires that no FC connections exist between the cluster members. Therefore, connecting the two Fabric Interconnects by using FC connections is more likely to prevent failover than to facilitate it.
Ethernet connections have been made in this scenario. The Layer 1 and Layer 2 high availability ports on the first Fabric Interconnect are connected to the Layer 1 and Layer 2 high availability ports on the second Fabric Interconnect by using Ethernet cables. The Layer 1 high availability port on the first device should connect to the Layer 1 high availability port on the second device. Likewise, the Layer 2 high availability port on the first device should connect to the Layer 2 high availability port on the second device.
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