Used to speed up convergence when an indirect failure occurs upstream in the network by immediately expiring the max_age timer
A bridge that receives a RLQ request immediately answers if it knows it has lost connection to the root queried because it has a root bridge different to the one specified in the RLQ query.
RLQ responses are flooded on designated ports. The sender of the RLQ request puts its bridge ID in the PDU. This is to ensure that when it receives back a reply to its own query, it does not flood the response on its designated ports.
SW1(config)#spanning-tree backbonefast
The Root Link Query
The RLQ request is sent out on a port where you usually receive BPDUs, in order to check that you still have connectivity to the root through this portA bridge that receives a RLQ request immediately answers if it knows it has lost connection to the root queried because it has a root bridge different to the one specified in the RLQ query.
RLQ responses are flooded on designated ports. The sender of the RLQ request puts its bridge ID in the PDU. This is to ensure that when it receives back a reply to its own query, it does not flood the response on its designated ports.
SW1(config)#spanning-tree backbonefast
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