(RLQ) to detect link outage in the network. In this blog I will try to explain how RLQ works.
Basically RLQ is like a ping request. The RLQ request is sent from the outgoing port of the inferior switch to its root bridge asking for a response. The RLQ request contains information on what this swicth believes to be the root bridge. The RLQ response is then received from the same port and the switch inspects the response and compares whether the information of the root bridge in the RLQ response is the same as what the switch has requested.
There are several actions taken by the peering switch that receives the RLQ request which are:
1. It inspects itself and is indeed the root switch
2. The receiving switch is not the root switch, and based on the information this switch has, the switch information on the RLQ request is also NOT the root switch. It considers another switch to be the root switch.
3. The receiving switch is not the root switch but (after comparing to its table) agrees with information on the RLQ request on the root switch. In that case, the receiving switch will forward the RLQ request to its superior bridge again.
Hop my information is clear enough.
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