To prevent out-of-order packets, it is recommended that Eth-Trunk use flow-based load balancing.
True
False
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First, what is an Eth-Trunk?
When we need to increase the available capacity of traffic between two equipment, we have two possibilities:
1 – Choose an interface with more capacity. 1GbE to 10GbE for example.
2 – Increase the number of interfaces.
The first option sometimes is not possible depending on the type of equipment. And on the second option, if we simply add new interfaces, we will cause an L2 loop and, if the STP was activated only one interface will forward traffic.
To solve this problem exists the Eth-Trunk interface. Some manufacturers call it Port-Channel interface, another call it as aggregation interface, or shared interface, etc.
But the function is the same, aggregate two or more interfaces adding the capacity as one unique.
The problem is that different interfaces can have different propagation times and the packets can arrive out of order. If the number of out-of-order packets is small and the protocol is TCP, normally this is not a problem. But we cannot say the same to protocols of real-time transmission.
To solve this, switches have a mechanism to identify the flow of communication and send all packets of the same flow through the same physical interface. This mechanism realizes the hash of some fields of the header to distinguish the flows.
After all that we read, the answer to this question is TRUE. We use the Flow-based loadbalance to prevent out-of-order packets.
You can know more about the Eth-Trunk interface on the HCIA-Datacom Training Material on this link.
Or on HedEx document with this link.
https://support.huawei.com/hedex/hdx.do?docid=EDOC1100175712&id=EN-US_TASK_0177102182&lang=en
Keep studying, and I hope that I´m collaborating with you.
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