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Question 155 - NCS-Core discussion

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For a new AHV cluster installation, a customer has 20 NX-8155-G6 nodes with quad port SFP NICs.

The customer wants to meet the following guidelines:

* Take advantage of all available 10GbE links

* Achieve maximum throughput per VM

* Use of redundant ToR switches

* Fastest reconvergence during link failure

How should the load balancing be configured on the host?

A.
ovs-vsctl set port br0-up bond_mode=balance-slb ovs-vsctl set port br0-up other_config:bond-rebalance-interval=30000 ovs-vsctl set port br0 tag=10
Answers
A.
ovs-vsctl set port br0-up bond_mode=balance-slb ovs-vsctl set port br0-up other_config:bond-rebalance-interval=30000 ovs-vsctl set port br0 tag=10
B.
ovs-vsctl set port br0-up bond_mode=active-backup ovs-vsctl set port br0-up other_config:bond-rebalance-interval=30000
Answers
B.
ovs-vsctl set port br0-up bond_mode=active-backup ovs-vsctl set port br0-up other_config:bond-rebalance-interval=30000
C.
ovs-vsctl set port br0-up bond_mode=balance-slb
Answers
C.
ovs-vsctl set port br0-up bond_mode=balance-slb
D.
ovs-vsctl set port br0-up other_config:lacp-fallback-ab=true ovs-vsctl set port br0-up lacp=active ovs-vsctl set port br0-up bond_mode=balance-tcp
Answers
D.
ovs-vsctl set port br0-up other_config:lacp-fallback-ab=true ovs-vsctl set port br0-up lacp=active ovs-vsctl set port br0-up bond_mode=balance-tcp
Suggested answer: D

Explanation:

In a Nutanix AHV cluster configuration with multiple NICs and ToR switches, achieving high throughput and maintaining link redundancy are critical. The configuration provided in Option D utilizes LACP (Link Aggregation Control Protocol) with active mode, which allows for aggregating multiple network connections in parallel to increase throughput and provide redundancy. The balance-tcp mode of the bonding ensures optimal traffic distribution based on the TCP session, ensuring each session can utilize maximum available bandwidth across multiple links. This setting is crucial for environments requiring high network performance and reliability.

Reference:

Nutanix Bible

Nutanix University NCS-Core Materials

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asked 23/09/2024
Alexandra Peralta Reyes
43 questions
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