# Bonded Topology for Commvault Flex Appliance

Bonded topology is the most common option for Commvault Flex Appliance as this provides network level redundancy for each node.

In this topology, the node requires connections to 2 - 10 GbE port for data protection network, which transfers data to and from the clients being protected and connect to the CommServe server.

Note

Bonded topology is the most used configuration and is recommended for most deployments. The bonding can be configured to provide redundancy using either the Active-Backup bonding or the Link Aggregation Control Protocol (LACP). This can also be used with a multi-switch link aggregation protocol such as Virtual Port Channel (VPC), MLAG, or MC-LAG to provide switch level redundancy.

- Each pair will be bonded on the node, so it is treated as one logical connection. If a node encounters a cable, SFP, or network card failures, the node remains operational without any user intervention. This can optionally be setup to connect to 2 switches to provide switch level redundancy.

- Active-Backup and Link Aggregation Control Protocol (LACP) are the supported bonding modes.

  LACP requires the switch(s) to support it as well. When using LACP, each pair of ports should be configured as an active port-channel, and not configured to negotiate the aggregation protocol.

## Network Requirements

The storage pool network is optional during Commvault Flex Appliance installation. Storage pool IP addresses on different nodes can be configured on different subnets. This provides greater flexibility in network design for Commvault Flex Appliance deployments. There are no hard validation checks or installation failures if storage pool IPs are on different subnets.

The following network names and IP addresses are required for a bonded topology:

| Node
--- | ---
Data Protection Fully Qualified Domain Name* |
Data Protection IP Address* |
Data Protection Netmask* |
Data Protection Gateway* |
Data Protection DNS 1* |
Data Protection DNS 2 |
Data Protection DNS 3 |
Data Protection NIC Port 1 Card 1 MAC Address |
Data Protection NIC Port 1 Card 2 MAC Address |
Storage Pool IP Address* |
Storage Pool Netmask* |
Storage Pool NIC Port 2 Card 1 MAC Address |
Storage Pool NIC Port 2 Card 2 MAC Address |

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