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# About loop protection

The loop protection feature enables detection of loops on downlink ports, which can be Flex-10 logical ports or physical ports. The feature applies when Device Control Channel (DCC) protocol is running on the Flex-10 port.

HPE OneView network loop protection uses two methods to detect loops:

1. The interconnect periodically injects a loop detection frame into the logical interconnect and analyzes the downlink ports for the looped back detection frame. If this detection frame is found on the downlink ports, the server has a loop condition.

2. The interconnect reviews and intercepts common loop detection frames used in other switches, such as Cisco and ProCurve to prevent any impact on the upstream switch.

When network loop protection is enabled on the Logical Interconnects screen, and a loop detection frame is received on a downlink port, the downlink port is disabled immediately until an administrative action is taken. The administrative action involves resolving the loop condition and clearing the loop protection error condition. The `loop detected` status on a server can be cleared by editing the server profile and un-assigning all networks from the connection corresponding to the server in the `loop detected` state.

The SNMP agent supports trap generation when a loop condition is detected or cleared.

You can reset loop protection from the Actions menu on the Interconnects screen.

See also

- Logical Interconnects

- Networks

- Troubleshooting: Pause flood condition detected on a Flex-10 physical port

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