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Barracuda Backup

Barracuda Backup Network Interface Bonding

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This article refers to the Barracuda Backup Legacy Release firmware or newer running on Barracuda Backup Server models 690 and above.

Bonding is the creation of a single bonded interface by combining two or more Ethernet interfaces. This helps in network interface high availability (ha) and offers performance improvement. Bonding is the same as port trunking or teaming.

By default, the second onboard 1 x Gb network interface on the 690 and 890 models, and the 1 x 10Gb network interface on the 990 and 1090 models, is disabled and denoted by a plastic RJ45 connector plugged into the interface. However, the two network interfaces can be bonded for 20 Gigabit throughput with failover capabilities. A typical use is to add a separate VLAN to be backed up or a designated replication interface. Contact Barracuda Networks Technical Support if you want to bond the two network interfaces; Barracuda Networks Technical Support can also bond the optional 10GbE fiber cards included on Barracuda Backup Server models 891, 991, and 1091.

Link Aggregation (LAG) allows you to bond two or more ports in parallel to achieve greater throughput. LAG has the following properties:

  • LAG provides automatic recovery when individual physical links fail. As long as at least one physical link exists, the LAG connection continues to exist.
  • Data transmission is distributed as frames over the physical links.
  • All frames forming part of a specific data communication packet are transmitted over the same physical connection, ensuring delivery of the individual frames of a data communication packet in the correct order, preventing disordering.

Barracuda Networks uses Mode 4 (802.3ad) bonding, known as Dynamic Link Aggregation mode. This mode creates aggregation groups that share the same speed and duplex settings, and requires a switch that supports IEEE 802.3ad Dynamic link. 

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