L2 Failover With Other Features; Lacp; Spanning Tree Protocol - Lenovo CN4093 Application Manual

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L2 Failover with Other Features

L2 Failover works together with Link Aggregation Control Protocol (LACP) and

with Spanning Tree Protocol (STP), as described in the next sections.

Link Aggregation Control Protocol allows the switch to form dynamic LAGs. You

can use the admin key to add up to two LACP LAGs to a failover trigger using

automatic monitoring. When you add an admin key to a trigger, any LACP LAG

with that admin key becomes a member of the trigger.

If Spanning Tree Protocol (STP) is enabled on the ports in a failover trigger, the

switch monitors the port STP state rather than the link state. A port failure results

when STP is not in a Forwarding state (such as Learning, Discarding or No

Link). The switch automatically disables the appropriate internal ports, based on

the VLAN monitor.

When the switch determines that ports in the trigger are in STP Forwarding state,

then it automatically enables the appropriate internal ports, based on the VLAN

monitor. The switch fails back to normal operation.

Chapter 33: Layer 2 Failover