Can an optical interface on the S5700EI in V100R003 that has a 1000M copper transceiver module installed communicate with a 100M electrical interface

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After an optical interface on the S5700EI in V100R003 has a 1000M copper transceiver module installed, the working rate of the optical interface is 1000 Mbit/s and the optical interface does not support the configuration of the auto-negotiation, rate, and duplex mode. Therefore, an optical interface that has a 1000M copper transceiver module installed cannot communicate with a 100M electrical interface.

Other related questions:
Can 1000M optical interface boards use 100M optical modules
Optical interfaces work at a rate of 1000 Mbit/s by default and do not support auto-negotiation. You must manually configure optical interfaces to work at a rate of 100 Mbit/s.

Why auto-negotiation cannot be configured after a 100M optical module is installed and then removed from a 100M/1000M optical interface on the S5700
On S5700 switches in versions earlier than V200R001, the default rate of 100M/1000M optical interfaces is 1000 Mbit/s. After a 100M optical module is installed on an optical interface, the optical interface automatically changes the rate to 100 Mbit/s. After the optical module is removed, the optical interface retains the 100 Mbit/s rate. When the rate of an optical interface is 100 Mbit/s, the interface does not support auto-negotiation. The auto-negotiation function cannot be configured. You can run the speed 1000 command or install a 1000M optical module to restore the interface rate to 1000 Mbit/s. On S5700 switches in V200R001 and later versions, the interface rate of a 100M/1000M optical interface restores the default rate 1000 Mbit/s after the optical module is removed.

Whether USG2100 interfaces are 100M or 1000M ones
The USG2100 provides WAN and LAN interfaces. WAN interfaces are Layer 3 interfaces with a rate of 10/100 Mbit/s (namely, 100M interfaces), and LAN interfaces are Layer 2 interfaces with a rate of 10/100 Mbit/s (namely, 100M interfaces).

Can the combo interface on the SRU connect to the 100M optical module
Yes, the combo interface on the SRU can connect to the 100M optical module. When the combo interface on the SRU connects to the 100M optical module, it does not support auto-negotiation mode, so the peer device must use the 100M optical module and the peer interface must be manually configured to work in full duplex mode.

Whether the subcard interface can serve as the heartbeat interface
Yes. Subcard interfaces can also serve as heartbeat interfaces and support backing up policies, sessions, and table entries.

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