Working with the ABXOR Bonds

R76SP.20 supports ABXOR Bonds, which provide slave interface redundancy and load sharing. An ABXOR Bond is divided into two or more sub-groups, known as bundles. Each bundle can have up to eight slave interfaces.

Bundles provide Active/Backup redundancy, where only one bundle is active at any given time. The system selects the active bundle based on these rules:

• The active bundle has the lowest index and at least as many active (UP) slave interfaces as the abxor threshold defined for the Bond. The abxor threshold is the minimum number of active slave interfaces necessary for a bundle to become active. You define an abxor threshold for each Bond.
• If no bundle has the minimum number of active slave interfaces, the bundle with the most active slave interfaces becomes the active bundle.

For example, a bundle has four slave interfaces and the Bond has an abxor threshold of three. The active bundle must have at least three active interfaces. If no bundle has the minimum quantity of active interfaces, the bundle with the most UP interfaces becomes active.

You can use abxor bonds with a different switch connected to each bundle. This provides both SSM and switch redundancy with Load Sharing. In the above example, each bundle connects to a different switch and has slave interfaces from both SSMs. If one of the switches and/or one of the SSMs fail, there will be no traffic interruption.