Performance Comparison of Ethernet switches--detailed control index

Switch type (rack style, fixed-profile with/without expansion slots The rack switch is a slot-type switch that is scalable and supports different network types, such as Ethernet, Fast Ethernet, Gigabit Ethernet, ATM, Token Ring, and FDDI, but the price is more expensive. A fixed-profile band-slot switch is a switch with a fixed number of ports and a small number of expansion slots, which, on the basis of support for fixed-port type networks, can support other types of networks, with the price centered. Fixed profiles with no expansion slot switches support only one type of network, but at the cheapest price.

Configuration:

Rack Slots--refers to the maximum number of modules that can be placed on a rack-type switch.

Number of expansion slots--the maximum number of modules that can be placed in a fixed configuration with an expansion slot switch.

Maximum stackable number--refers to the maximum number of switches that can be stacked in a stacked unit. This parameter describes the maximum port density that can be supplied in a stacked cell.

Min/MAX 10M Ethernet Port-refers to the minimum/maximum number of 10M Ethernet ports supported by a single switch.

Min/MAX 100M Ethernet Port-refers to the minimum/maximum number of 100M Ethernet ports supported by a single switch.

Min/MAX 1000M Ethernet Port-refers to the minimum/maximum number of 1000M Ethernet ports that a switch can connect to.

Supported Network types:

In general, a fixed profile without an expansion slot switch supports only one type of network, the rack switch and the fixed configuration band expansion slot switch can support more than one type of network, such as Ethernet support, Fast Ethernet, Gigabit Ethernet, ATM, Token Ring, and FDDI. The more network types a switch supports, the stronger its availability and scalability.

Maximum ATM port number--ATM is asynchronous transfer mode. The maximum number of ATM ports is the maximum number of ATM ports supported by an ATM switch or a multiple service multifunction switch.

The maximum sonet port number--sonet is the synchronous Optical network abbreviation, is a high speed synchronization network specification, the maximum rate can reach 2.5 Gbps. The maximum number of SONET ports for a single switch refers to the maximum number of SONET interfaces for this switch.

Maximum FDDI ports--refers to the maximum number of FDDI ports supported by a FDDI switch or a multiple service multifunction switch.

Backplane throughput (bps)-also known as backplane bandwidth-is the maximum amount of data that can be throughput between a switch interface processor or an interface card and an information bus. The higher the bandwidth of a switch's backplane, the stronger the ability to process data, but also the cost of design.

The buffer size-sometimes called the packet buffer size-is a queue structure that is used by the switch to coordinate the speed matching between different network devices. Burst data can be stored in a buffer until it is processed by a slow device. Buffer size should be moderate, too large buffer space will affect the normal communication state packet forwarding speed (because too large buffer space requires a relatively little bit of addressing time), and increase the cost of equipment. And too small buffer space in the event of congestion and easy to lose the packet error. Therefore, the appropriate buffer space plus the advanced buffer scheduling algorithm is a reasonable way to solve the buffer problem. For network backbone devices, you need to pay attention to several points:

Whether each port has the independent buffer space, and the working state of the buffer space does not affect other port buffering state;

Whether the module or port is designed with an independent input buffer, an independent output buffer, or an input/output buffer;

Is there a series of buffer management scheduling algorithms, such as Red, wred, Rr/fq and WERR/WEFQ.

Maximum MAC Address Table size--each port or device connected to the LAN requires a MAC address that other devices use to locate specific ports and update routing tables and data structures. The MAC address is 6 bytes long and is assigned by IEEE, also called the physical address. The MAC Address Table size of a device reflects the maximum number of nodes that can be supported by the device.

Maximum power supply--generally, the core equipment provides a redundant power supply, after a power failure, the other power supply can continue to power, does not affect the normal operation of the equipment. In the case of multiple power supply, pay attention to the use of multi-channel mains supply, so that when the line fails, other lines can still power.