Line rate forwarding of S series switches

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Line rate forwarding indicates that no packet is lost when the maximum rate of an interface is reached.
Total bandwidth provided by all interfaces of a switch = Number of interfaces x Interface rate x 2 (full-duplex mode)
If the total bandwidth is less than or equal to the backplane bandwidth, data is forwarded at line rate on the backplane.

Other related questions:
Why cannot a DAI-enabled S series switch forward valid ARP packets at line rate
For S series switches, in versions earlier than V200R001, a DAI-enabled switch checks ARP packets based on ACL rules delivered to the chip. Therefore, packets are directly forwarded at line rate. In V200R001 and later versions, a DAI-enabled switch checks ARP packets and forwards valid ARP packets using software. The forwarding rate depends on factors such as the CPCAR value of the ARP packet and CPU usage. For E series switches, a DAI-enabled switch checks ARP packets and forwards valid ARP packets using software. The forwarding rate depends on factors such as the CPCAR value of the ARP packet and CPU usage.

Why cannot a DAI-enabled switch forward valid ARP packets at line rate
In earlier versions of V200R001, a DAI-enabled switch checks ARP packets based on ACL rules delivered to the chip. Therefore, packets are directly forwarded at line rate. In V200R001 and later versions, the DAI-enabled switch checks ARP packets and forwards valid ARP packets using software. The forwarding rate depends on the CIR value of the ARP packet and CPU usage.

Whether the S-series switches support fast forwarding
support

Rate supported by the combo port on an S series switch
For S series switches (except S1700 switches), the working rate of a combo port is as follows: - When the combo port works as an optical port, the working rate is 100/1000 Mbit/s. - When the combo port works as an electrical port, the working rate is 10/100/1000 Mbit/s. Some devices have interface-related identifiers on the interface panel, and you can determine the working rate of a combo port based on the identifiers.

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