Will ports be blocked when two S series switches are connected using two Ethernet cables

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If STP is enabled globally and on the ports of two S (except the S1700) series switches, one of the two connected ports of the two switches will be blocked.

Other related questions:
How many cables are required to connect two stacks
To ensure reliability and service bandwidth, you are advised to take the following precautions when connecting two stacks of S series fixed switches. 1. Two or more cables are required to perform link backup, ensuring system reliability. 2. You are advised to connect the stacks with an even number of cables. 3. More cables connected can provide higher link bandwidths for transmitting services between the stacks.

Connect the S series switches to servers by using link aggregation
To connect a standalone or a stacked S series switch (except the S1700) to a server with dual or multiple network adapters, first configure link aggregation on interfaces of the switch. For example, to connect the S5700 to a server with dual network adapters, create an Eth-Trunk between two interfaces on the S5700 and then connect the S5700 to the server using two network cables. You can connect a switch to a server with dual network adapters in the following modes: 1. round robin (link aggregation must be configured on the switch). Characteristics: (1) All the links work in load balancing state and packets are transmitted on a per-packet basis to each link in round robin mode. If you ping the address 10.1.1.1 from the server, packets are transmitted on two network adapters of the server. (2) This mode improves bandwidth and supports error tolerance. If one link fails, traffic is switched to the other normal link. 2. active-backup (This mode can be applied without configuration on the switch). Characteristics: One port works in active state and another port works in backup state. All traffic is transmitted on the active link and there is no traffic on the backup link. If the active port goes Down, the backup port changes to the active state. 3. 802.3ad (link aggregation in LACP mode needs to be configured on the switch). 4. adaptive load balancing (no configuration is required on the switch). In this mode, you do not need to configure the switch because the two network adapters that are bound using bonding technology use different MAC addresses.

Does STP need to be enabled on a stack to connect the stack to a switch using two cables
Configure Eth-Trunk on a stack of S series switches after the stack is connected to a switch. STP is not required.

Will loops occur when two network adapters of a server connect to a stack of S series fixed switches
If the two server network adapters do not transparently transmit packets to each other, no loop will occur. You are advised to enable the link aggregation function on stack switches.

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