Fail-to-Block Mode
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Fail-to-Block Mode
This chapter provides information about the fail-to-block mode on SteelHead and SteelFusion
appliances and details the hardware and software versions that support fail-to-block mode. It includes
the following sections:
•
•
“Fail-to-block CLI commands” on page 18
This chapter assumes you have installed and configured the appliance.
Important:
For SteelHead SD 3070-SD appliances, bypass NICs aren’t required for SteelConnect gateway
deployments since LAN traffic requires network address translation (NAT) before it reaches the service provider
network. For details on supported SteelHead SD nonbypass NICs, see
“SteelHead GX10000” on page 54
Overview
This section describes fail-to-block mode as compared to the default fail-to-bypass mode.
Fail-to-bypass mode lets the network maintain connectivity in the event of a failure, without
optimization. With fail-to-block mode enabled in a redundant network path environment, traffic is
blocked and rerouted to an optimized backup path in the event of a failure.
This feature is useful only if the network has a routing or switching infrastructure that can automatically
divert traffic from the link to the optimized backup path. In an active-backup redundant network setup,
the active path is configured to use fail-to-block mode, and the backup path is configured to use fail-
to-bypass mode, thus traffic continues to be optimized on the backup path if there’s a failure on the
active path. In the event of a failure, the LAN and WAN interfaces power down. From a connected router
or switch perspective, those devices don’t detect a link.
RiOS supports fail-to-block mode on all cards, including cards that don’t have hardware fail-to-block
capabilities, allowing fail-to-block mode functionality with most NICs while the operating system is
running.
The following events trigger fail-to-block mode if the feature is enabled:
•
Kernel crash
•
Hardware failure
•
Power loss
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