Which of the following technologies implements inter-device link aggregation, and can be used to build an active-active system to provide traffic load balancing and backup protection?
M-LAG (Multi-Chassis Link Aggregation Group) is a technology that implements link aggregation across two or more independent physical devices (i.e., switches).
It enables downstream devices (such as servers or switches) to connect to two upstream devices as if they were one logical device.
This allows for:
Active-active forwarding (traffic load balancing)
Device-level redundancy (if one upstream device fails, the other continues forwarding traffic)
Eth-Trunk refers to link aggregation but generally within a single device.
Stack creates a logical switch from multiple physical switches, but it does not address inter-device aggregation in the same distributed manner as M-LAG.
LLDP (Link Layer Discovery Protocol) is a Layer 2 protocol for device discovery and has no role in link aggregation.
[Reference:, Huawei HCSA-IP Network V4.0 Study Guide → Chapter: Huawei Campus Network Solutions → Section: M-LAG Technology, Huawei CloudCampus Technical White Paper → Section: High Reliability with M-LAG, ════════════════════════════════════]
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