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You will need to check the manual. &nbsp;According to the web site for the H3C S5120 it does support link aggregation. &nbsp;What Cisco called Etherchannel, some vendors call trunking, not to be confused with Cisco's trunking.
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You will need to check the manual.  According to the web site for the H3C S5120 it does support link aggregation.  What Cisco called Etherchannel, some vendors call trunking, not to be confused with Cisco's trunking.

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The Ether-channel protocol must be LACP (Link Aggregation Control Protocol) on the Cisco and H3C
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The Ether-channel protocol must be LACP (Link Aggregation Control Protocol) on the Cisco and H3C

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Just to add, &nbsp;after a recent test between my HP C7000 (Flex 10) and Brocade RX16 switch that Dynamic LAG mode worked over static. &nbsp;Dynamic LAG uses 802.3ad LACP vs static LAG mode works somewhat differently. &nbsp;Resulting in the HP C7000 shared uplink set LAG not being created without dynamic being configured on the connected switch. &nbsp;Further research indicates Dynamic LAG appears to be the typical configuration between manufactures with the exception of Cisco's EtherChanel which most likely operates in dynamic mode.
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Just to add,  after a recent test between my HP C7000 (Flex 10) and Brocade RX16 switch that Dynamic LAG mode worked over static.  Dynamic LAG uses 802.3ad LACP vs static LAG mode works somewhat differently.  Resulting in the HP C7000 shared uplink set LAG not being created without dynamic being configured on the connected switch.  Further research indicates Dynamic LAG appears to be the typical configuration between manufactures with the exception of Cisco's EtherChanel which most likely operates in dynamic mode.

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I always setup EtherChannel between Cisco switches. But now I have a H3C multilayer switch in the network and I'd like to bond 4 ports together between my Catalyst 3750 and the H3C S5120. Not sure if it is possible.
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I always setup EtherChannel between Cisco switches. But now I have a H3C multilayer switch in the network and I'd like to bond 4 ports together between my Catalyst 3750 and the H3C S5120. Not sure if it is possible.

EtherChannel

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.

Switches / Hubs

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.

Networking

Network design and methodology, also known as network architecture, is the design of a communication network. It is a framework for the specification of a network's physical components and their functional organization and configuration, its operational principles and procedures, as well as data formats used in its operation. In telecommunication, the specification of a network architecture may also include a detailed description of products and services delivered via a communications network, as well as detailed rate and billing structures under which services are compensated.