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Industrial field environment For various reasons, what kind of industrial Ethernet switch should be selected is the most suitable? The switch is very important, it grasps the lifeblood of a network, then how to choose a switch? What switch is used? For example, the working environment, whether it needs redundancy, network management and non-network management, future maintenance and scalability.

1. Work environment considerations: temperature range, EMC electromagnetic compatibility, protection level, installation method and power supply. Commercial Ethernet switches are designed for environments that are not suitable for industrial switches, such as environments with extreme temperatures and high vibrations that are too strong for electromagnetic noise.

2. Choose network management type or non-network management type switch: If the network is relatively simple, you can use the plug-and-play non-network management type switch; if it is convenient for future maintenance, you may need to choose the network management type. Only the network management type switch can achieve the ring type. Topological connection.

3. It is also necessary to meet relevant industrial standards: for example, marine switches should meet the ship structure standards; if there are dangerous applications, they must comply with the corresponding certification standards, and the transportation industry such as rail transit and highways also have their own standards.

When the switch is purchased, in addition to the basic standards recommended by RFC2544, namely throughput, delay, and packet loss rate, as the user service increases and the application deepens, some additional indicators, such as MAC, are also satisfied. Number of addresses, routing table capacity (Layer 3 switches), number of ACLs, LSP capacity, number of supported VPNs, etc.

The most direct indicator of switch function: general access layer switch, simple QoS guarantee, security mechanism, support network management policy, spanning tree protocol and VLAN are all essential functions. After careful analysis, some functions are further refined. Points, and these subdivision functions are the main reasons for product differentiation, and also an important way to reflect the added value of products.

Managed switches also have advanced features that improve your network control capabilities. Features such as Quality of Service (QoS), Virtual Local Area Network (VLAN), Port Mirroring, IGMP Snooping, Redundancy, and SMMP are usually only available on managed switches. Most managed switches have features:

● Through the State Grid Corporation tender selection type A test

● Complies with IEC 61850-3 substation communication network and system certification standards and IEEE 1613 specifications

● Supports multiple dynamic routing protocols such as RIP, OSPF, and BGP, static routing, and IP policy routing.

● Supports multiple multicast routing protocols such as PIM-SM, PIM-DM, and DVMRP.

● 3 module slots, more than 10 business modules, up to 28 100M optical ports

● Multiple universal redundant power inputs 24/48 VDC or 110/220 VDC/VAC

● Supports redundant ring network protection BD-EAPS (switching time <50ms), RSTP/STP redundancy protocol

● Supports management functions such as QoS, VLAN, and IGMP Snooping/GMRP.

● Provide real-time temperature detection and monitoring of products, and flexibly set alarm thresholds

● Operating temperature range -40 ° C ~ 85 ° C

● Support Jumbo Frame up to 13K, and Layer 3 packet forwarding rate is 9.6Mpps

● Support LLDP link layer discovery protocol, retrieve network device topology discovery

● Supports Layer 3 switching technology and supports multiple dynamic routing protocols such as RIP v1/v2, OSPFv2, and BGPv4. Static routing and IP policy routing.

● Supports multiple multicast routing protocols such as PIM-SM, PIM-DM, and DVMRP.

● DHCP Opition 82, which is used to assign IP addresses with different policies.

● Supports multicast packet transmission such as IEC 61850 GOOSE and sampled values

● Support BD-EAPS and RSTP/STP/MSTP (IEEE 802.1w/d/s)

● Support IGMP Snooping and GMRP filtering multicast packets

● Supports port-based VLAN, IEEE 802.1Q VLAN, and GVRP protocol for easy network management

● Improve decision-making mechanism through QoS--IEEE 802.1p/1Q and TOS/DiffServ

● Optimize network bandwidth with 802.3ad and LACP

● Support IEEE 802.1X, https and SSL to enhance network security

● Supports SNMP V1/V2c/V3 for different levels of network management

A key issue when choosing an industrial Ethernet switch is to choose a network management type that is not a managed switch. Although managed switches are usually more expensive, they offer some extra power. Managed switches contain the characteristics of unmanaged switches.