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Configuration Guide - Ethernet Switching

CloudEngine 8800, 7800, 6800, and 5800 V200R003C00

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, MUX VLAN, Voice VLAN, VLAN mapping, QinQ, GVRP, VCMP, STP/RSTP/MSTP, VBST, SEP, RRPP, ERPS, LBDT, and Layer 2 protocol transparent transmission.
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Inter-device Link Aggregation

Inter-device Link Aggregation

Based on uplink device deployment technologies, CE series switches support three inter-device link aggregation technologies: M-LAG, standalone device, and stack.

Inter-device Link Aggregation (Standalone Device)

Inter-device link aggregation (standalone device) extends link aggregation in LACP modes. It implements link aggregation between one standalone device and two devices, and achieves device-level link reliability but not card-level link reliability.

It is used in scenarios where a switch or server is dual-homed to a dual-active network, and protects traffic on the link between the switch or server and the upstream device or protects traffic when one upstream device fails. If inter-device link aggregation (standalone device) is not used, the switch or server can be only single-homed to the remote device through the Eth-Trunk. If the Eth-Trunk or the remote device fails, the switch or server cannot communicate with the remote device. If inter-device link aggregation (standalone device) is used, the switch or server can be dual-homed to two devices that evenly load balance data. When one device fails, traffic can be forwarded through the other device, implementing device-level reliability.

In Figure 3-11, negotiation of the inter-device Eth-Trunk is successful when DeviceB and DeviceC have the same Eth-Trunk ID, LACP system ID, and LACP system priority but different numbers of Eth-Trunk member interfaces.

Figure 3-11 Inter-device link aggregation (standalone device)

Inter-device Link Aggregation (M-LAG)

M-LAG allows two access switches in the same state to perform link aggregation negotiation with the access device. In Figure 3-12, the access device communicates with the M-LAG through link aggregation, achieving device-level reliability but not card-level reliability. The M-LAG is a dual-active system that is composed of two access switches.

M-LAG is a horizontal virtualization technology that virtualizes two M-LAG devices into one logical device, that is, a unified Layer 2 logical node. In practice, M-LAG provides loop-free networking between aggregation and access layers and replaces STP. Compared with STP, M-LAG provides clear logical topology and better link use efficiency.

M-LAG master and backup devices forward data simultaneously and their forwarding behaviors are the same. The forwarding behaviors of M-LAG master and backup device roles are different only in scenarios where faults occur.

Figure 3-12 Physical and logical topologies of M-LAG

Inter-device Link Aggregation (Stack)

Inter-device link aggregation (stack) aggregates interfaces on member switches of the stack into one Eth-Trunk.

It is applied to scenarios where the stack is connected to other devices, and protects the link between upstream and downstream devices. The aggregated link can still work even if a member switch fails or one link of the aggregated link fails, ensuring reliable transmission of data traffic. This prevents single-point failures of a member device in a stack and greatly improves the network-wide reliability.

Figure 3-13 Physical and logical topologies of inter-device link aggregation (stack)
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Updated: 2019-05-08

Document ID: EDOC1100004351

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