How to quickly determine the performance of a Gigabit Switch

GE switches are still commonly used, so I studied how to judge the performance of GE switches. Here I will share with you, hoping to help you. It is critical to grasp the main performance indicators of GE switches. to judge the performance of switches, consider the following factors:

The forwarding technology storage and forwarding technology requires the switch to decide how to forward after receiving all data packets. The Gigabit Switch using this technology can check the integrity and correctness of the data packets before forwarding, reduces unnecessary data forwarding. Direct forwarding starts to forward data before the switch receives the entire frame, which can effectively reduce the switching delay. However, the switch has started data forwarding before completely receiving and checking the correctness of the data packets. In this way, in an environment with low communication quality, the Gigabit Switch will forward all the complete data packets and error data packets, which actually brings a lot of junk communication packets to the entire switching network. Therefore, direct Forwarding is suitable for network environments with good network link quality and few error packets.

Throughput: The maximum theoretical value of the Ethernet throughput is referred to as the line rate, which means that the switch has sufficient capacity to process data packets of various sizes at full speed, and all Gigabit Switch products should reach the line rate.

Management functions: Generally, vswitch vendors provide management software or third-party management software to remotely manage vswitches. The common switch supports the snmp mib I/MIB II statistical management function, while the complex gigabit switch supports the RMON active monitoring function by adding the built-in RMON group mini-RMON. Some switches also allow external RMON to monitor the network conditions of the available ports.

Latency: A Gigabit Switch Using pass-through forwarding technology has a fixed latency, because a pass-through switch determines the forwarding direction only based on the destination address regardless of the overall data packet size. Therefore, its latency is fixed. Because the switch that uses the storage and forwarding technology must receive the complete data packet before it starts forwarding, if the data packet is large, the delay is large; if the data packet is small, the delay is small.

Single/Multi-MAC address type single MAC switches are designed to connect end users, share resources over networks, or non-bridging routers. They cannot be used to connect hubs or CIDR blocks containing multiple network devices. Multiple MAC switches have enough storage bodies on each port to remember multiple hardware addresses. Each port of a Multi-MAC switch can be considered as a hub, and the entire switch can be considered as a hub of a hub.

Full Duplex: The full duplex port can send and receive data at the same time. A switch with the full duplex function can obtain two times the throughput of the single-work communication, it also avoids the collision between data sending and receiving. Currently, mainstream Gigabit Switches such as Cisco and 3Com Support automatic full/Half Duplex switch.

VLAN support: by dividing a LAN into virtual network vlan cidr blocks, network management and network security can be enhanced to control unnecessary data broadcast. In a virtual network, a broadcast domain can be a virtual network segment consisting of any selected MAC addresses. In this way, the Working Groups in the network can break through the geographic location restrictions in the shared network and divide them according to the management function.

Link aggregation: link aggregation provides excellent scalability for the link bandwidth between switches and servers. For example, two, three, and four Gigabit Links can be bound together, multiply the bandwidth of the link. Link aggregation technology can achieve load balancing of different ports, and also backup each other to ensure link redundancy. These Gigabit Ethernet switches support up to four link aggregation groups and each group has up to four ports. Link aggregation generally does not allow cross-chip settings. Both the Spanning Tree Protocol and link aggregation can ensure the redundancy of a network. Set redundant links in a network and use the Spanning Tree Protocol to block the backup link without forming a loop logically. If a fault occurs, the backup link is enabled.

Security: security is becoming more and more important. ge switches can isolate illegal customers from the network at the underlying layer. All the vswitches that can be managed support the MAC address filtering function. You can also bind the MAC address with a fixed port and the VLAN.