L2 Failover With Other Features; Static Lags; Lacp; Spanning Tree Protocol - Lenovo RackSwitch G8264 Application Manual

L2 Failover with Other Features

Static LAGs

LACP

Spanning Tree Protocol

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G8264 Application Guide for ENOS 8.4
L2 Failover works together with static LAGs, Link Aggregation Control Protocol
(LACP), and with Spanning Tree Protocol (STP), as described in the next sections.
When you add a portchannel (static LAG) to a failover trigger, any ports in that
LAG become members of the trigger. You can add up to 64 static LAGs to a failover
trigger, using manual monitoring.
Link Aggregation Control Protocol allows the switch to form dynamic LAGs. You
can use the admin key to add up to 64 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)
in all the Spanning Tree Groups (STGs) to which the port belongs. The switch
automatically disables the appropriate control ports.
When the switch determines that ports in the trigger are in STP Forwarding state in
any one of the STGs it belongs to, then it automatically enables the appropriate
control ports. The switch fails back to normal operation.
For example, if a monitor port is a member of STG1, STG2, and STG3, a failover
will be triggered only if the port is not in a forwarding state in all the three STGs.
When the port state in any of the three STGs changes to forwarding, then the
control port is enabled and normal switch operation is resumed.