Scale-out switch planes are IP-based rather than PCIe-based

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The reasons are as follows:
1. The IP switching technology is a common and mature practice in the industry. The IP protocol has been the de facto standard of data center standards. The IP switching complies with Huawei's ALL IP development trend.
2. For mid-range storage arrays, using IP switches can save the cost. PCIe switches are for specific purposes and bring higher costs. It is applicable to high-end storage.
3. The iWARP based on the IP protocol is a high-performance transmission technology. Its latency meets requirements of mid-range storage.

Other related questions:
Protocol of IP scale-out switch planes
The switch plane protocol is the iWARP (Internet Wide Area RDMA Protocol). The iWARP is one of the technologies for high-performance transmission at 10GbE (10 Gigabit Ethernet) or higher rates. The iWARP is built on the basis of TCP/IP. It can utilize the existing network infrastructure. Through the RDMA over Ethernet technology, iWARP can provide data centers with integrated and low-latency switching services.

Difference between forwarding modes of Layer 2 multicast on an S series switch
After Layer 2 multicast is enabled on an S series switch, the switch maintains a Layer 2 multicast forwarding table. When receiving a multicast packet, the switch matches the multicast address of the packet with multicast forwarding entries to determine the outbound interface. Whether the switch determines the outbound interface based on the multicast IP address or multicast MAC address depends on the configured Layer 2 multicast forwarding mode. Multiple multicast IP addresses may be mapped to one MAC address. If multicast data is forwarded based on the MAC address, multicast data may be sent to the users who do not order the multicast data. MAC address-based multicast forwarding can improve specifications in certain scenarios. Different models support different Layer 2 multicast forwarding modes: - The S1720, S2700SI, S2710SI, S2700EI, S2720, S2750EI, S5700S-LI, and S5700LI support only MAC address-based multicast forwarding. - The S3700SI and S5710-C-LI support only IP address-based multicast forwarding. - The S5700SI supports only IP address-based multicast forwarding in V200R002 and earlier versions, and supports MAC address-based and IP address-based forwarding modes starting from V200R003. - The S3700EI, S3700HI, S5710-X-LI, S5720S-SI, S5720SI, S5700EI, S5710EI, S5720EI, S5700HI, S5710HI, S5720HI, S6700EI, S6720EI, S7700, S9700, S12700, S9300, and E600 support MAC address-based and IP address-based forwarding modes.

Delete ARP entries on S series switch
On an S series switch, except S1700, run the reset arp { all | dynamic [ ip ip-address [ vpn-instance vpn-instance-name ] ] | interface interface-type interface-number [ ip ip-address ] | static } command in the user view to delete ARP entries. The parameters are as follows: all: deletes all ARP entries. dynamic: deletes dynamic ARP entries. static: deletes static ARP entries. interface: deletes ARP entries on the specified interface. ip-address: deletes ARP entries of the specified IP address. vpn-instance: deletes ARP entries in the specified VPN instance. Run the undo arp static ip-address mac-address [ vpn-instance vpn-instance-name | [ vid vlan-id [ cevid ce-vid ] ] interface interface-type interface-number[.subinterface-number ] ] or undo arp static ip-address [ vpn-instance vpn-instance-name | vid vlan-id [ cevid ce-vid ] interface interface-type interface-number[.subinterface-number ] ] command in the system view to delete ARP entries.

IP address allocation based on sub IP address
All S series switches except S1700 switches in all versions assign IP addresses in interface address pools and global address pools based on primary IP addresses, but not secondary IP addresses. That is, users cannot obtain IP addresses on the same network segments as secondary IP addresses.

Configure rate limiting based on IP addresses
You can run the qos car command in the interface view to configure rate limiting based on IP addresses.

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