Ethernet switch parameters learning notes

With the development of China's exchange industry, it also promotes the upgrade of various exchange technologies. Here we analyze the specific functions of various main parameters in the Ethernet switch. Generally, fixed configuration switches with no expansion slot support only one type of network. Rack-mounted Ethernet switches and fixed configuration switches with expansion slots support more than one type of network, for example, Ethernet, fast Ethernet, Gigabit Ethernet, ATM, licensing ring, and FDDI are supported.

Rack-mounted switches, fixed configuration with/without expansion slots) rack-mounted Ethernet switches are slot switches that support different network types, such as Ethernet, fast Ethernet, Gigabit Ethernet, ATM, licensing ring, and FDDI, but the price is relatively high.

A fixed-configuration Ethernet switch with an expansion slot is an Ethernet switch with a fixed number of ports and a small number of expansion slots. Such a switch can support other types of networks based on a fixed-port network, the price is centered. Fixed configuration Ethernet switches with no expansion slot support only one type of network, but the price is the cheapest.

Rack slots-the maximum number of modules that a rack-mounted Ethernet switch can insert.

Number of expansion slots-refers to the maximum number of modules that can be inserted by fixed configuration switches with expansion slots.

The maximum number of Ethernet switches that can be stacked in a stack unit. This parameter specifies the maximum port density available in a stack unit.

The minimum/maximum number of 10 M Ethernet ports is the minimum/maximum number of 10 M Ethernet ports supported by a vswitch.

The minimum/maximum number of M Ethernet ports is the minimum/maximum number of M Ethernet ports supported by a switch.

The minimum/maximum number of M Ethernet ports refers to the minimum/maximum number of M Ethernet ports that a switch can connect.

Supported network types

Generally, fixed configuration switches with no expansion slot support only one type of network. Rack-mounted Ethernet switches and fixed configuration switches with expansion slots support more than one type of network, for example, Ethernet, fast Ethernet, Gigabit Ethernet, ATM, licensing ring, and FDDI are supported. The more network types A vswitch supports, the higher the availability and scalability.

Maximum number of ATM ports-ATM is the asynchronous transmission mode. The maximum number of ATM ports is the maximum number of ATM ports supported by an ATM switch or a multi-service multi-function switch. Maximum number of SONET ports-SONET is the abbreviation of Synchronous Optical Network. It is a high-speed synchronization Network specification with a maximum speed of 2.5 Gbps. The maximum number of SONET ports of a vswitch is the maximum number of downstream SONET interfaces of the vswitch.

Maximum number of FDDI ports: the maximum number of FDDI ports supported by an FDDI switch or a multi-service multi-function switch. Backplane throughput bps)-also known as backplane bandwidth, is the maximum amount of data that can be transferred between the Ethernet switch interface processor, interface card, and data bus. The higher the bandwidth of the backboard of an Ethernet switch, the stronger the ability to process data, but the design cost will also rise.

Buffer size-sometimes called the packet buffer size, is a queue structure that is used by Ethernet switches to coordinate speed matching between different network devices. Burst data can be stored in the buffer until it is processed by a slow device. The buffer size should be moderate. A large buffer space will affect the forwarding speed of data packets in normal communication, because a large buffer space requires a little more addressing time) and increase the device cost. A small buffer space is prone to packet loss errors when congestion occurs. Therefore, adding an advanced buffer scheduling algorithm to an appropriate buffer space is a reasonable way to solve the buffer problem. Pay attention to the following points for the network trunk device:

Whether each port has an independent buffer space, and the working status of the buffer space does not affect the buffering status of other ports; whether the module or port has an independent input buffer and an independent output buffer, or input/output buffering; whether there are a series of buffer management scheduling algorithms, such as RED, WRED, RR/FQ, and WERR/WEFQ. Max MAC address table size-each port or device connected to the LAN needs a MAC address, which is used by other devices to locate a specific port and update the route table and data structure. The MAC address is 6 bytes long and is allocated by IEEE. It is also called a physical address. The MAC address table size of a device indicates the maximum number of nodes that can be connected to the device.

Maximum number of power supplies-generally, the core equipment provides redundant power supplies. After a power supply fails, other power supplies can continue to provide power, without affecting the normal operation of the equipment. When multiple power supplies are connected, pay attention to the use of multiple mains supply. In this way, when one line fails, other lines can still provide power.

The routing information protocol (RIP-RIP) is a distance vector protocol that uses the number of hops as the Metering Standard. RIP is widely used in the routing selection of global interconnection networks. It is an internal gateway protocol provided by the UNIX Berkeley standard distribution system. Ip rip is defined in RFC 1058 and RFC 1723. RIP2-is the latest enhanced version of RIP. It allows RIP packets to contain more information and provides a simple authentication mechanism. It is described in RFC 1723. Open Shortest Path First version 2nd (OSPFv2)-it is the second version of OSPF. OSPF is a connection status routing protocol, which is an IETF of an interconnected network engineering task group. The internal gateway protocol workgroup is designed for IP addresses, it is the next link State hierarchical routing algorithm of RIP in the Internet communication body. OSPF features include least-cost routing, multi-path, and load balancing. OSPF was developed from an earlier version of the IS-IS protocol and has two main features: first, the Protocol IS open, for example, RFC 1247 has OSPF rules. Second, OSPF is built on the SPF algorithm. SPF is also called DIJKSTRA algorithm. It is named after the founder of this algorithm.

The Border Gateway Protocol BGP--BGP is used to replace the EGPExterior Gateway Protocol) Inter-Domain Routing Protocol. The accessibility of information exchange between BGP and other BGP systems is defined by RFC 1163. BGP4 is the fourth version of BGP. It supports CIDR and uses the Routing aggregation mechanism to reduce the size of the route table.