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2.12.4 Eth-Trunk Preferentially Forwarding Local Traffic
The stack cable bandwidth is limited. To improve forwarding efficiency and reduce
inter-device forwarded traffic, you need to configure an Eth-Trunk to preferentially forward
local traffic. Then traffic received by the local device is first forwarded from the interface of
the local device. If the interface becomes faulty or the traffic reaches the line rate of the
interface, the traffic is forwarded from the interface of another member device.
As shown in Figure 2-29, three devices form a stack, and their uplink interfaces are added to
an Eth-Trunk. If preferential local traffic forwarding is not configured, traffic received by a
member switch is forwarded from the physical interface of another member switch through
the cluster cable. However, the limited stack cable bandwidth restricts traffic forwarding
performance. After preferential forwarding of local traffic is configured, traffic received by a
member switch is first forwarded from the interface of the local device without passing
through the stack cable.
Figure 2-29 Preferential local traffic forwarding
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