biggynet used Ask the Experts™
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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Top Expert 2014

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.

The Ether-channel protocol must be LACP (Link Aggregation Control Protocol) on the Cisco and H3C
Manager of IT
H3C S5120-SI - Supports the following Link Aggregation (LACP)

l   Dynamic aggregation of Gigabit Ethernet (GE) ports
l   Dynamic link aggregation through Link Aggregation Control Protocol (LACP)
l   Manual link aggregation
l   Support up to (total number of ports/2) link aggregation groups, each supporting up to eight GEs

For compatibility with Cisco I assume the defualt static Link Aggregation mode should be suffice, but can apply try dynamic mode to see if is compatible as well as.  Also, configure the same Native VLANs and Tagged VLANs on both sides with obviously the same interface types of Gigabyte Ethernet interfaces hard code port speed and duplex on both sides.

On the H3C S5120-SI create a 'interface bridge-aggregation' group number, configure LACP port and System priorities (the lower the number the higher the priority), and create a 'Port Link-Aggregation' group assigning interfaces to the bridge-aggregation group.

Please reference the link below on configuration details:
05-Ethernet Link Aggregation Commands

On the Cisco you need to configure an Ether-channel in a the same fashion that you are accustom to on the Cisco 3750.
gsmartinManager of IT

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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