LAN switch overview and Maintenance

LAN switches are quite common. So I studied LAN switches overview and maintenance instructions, and I will share them with you here. I hope they will be useful to you. The storage and forwarding method is the most widely used in the computer network field. It stores input port data packets and performs CRC checks, the destination address of the data packet is extracted after the error packet is processed. The destination address is converted to the output port through the search table.

Because of this, the storage and forwarding method is insufficient when the data processing latency is large. It can only detect errors of packets entering the LAN switch, in particular, it supports conversion between input and output ports at different speeds to ensure the collaboration between high-speed ports and low-speed ports.

Layer 2 and Layer 3 switching and competition with router Solutions

LAN switches work on the second layer of OSI and can be understood as a multi-port bridge. Therefore, they are traditionally called Layer 2 switches. At present, the exchange technology has extended some of the functions of the third layer of OSI, the layer-3 switch does not spread broadcast packets, but directly uses the dynamically established MAC address to communicate. It seems that the layer-3 information, such as IP addresses and ARP, can be understood, it provides routing functions based on IP, IPX, and other protocols between multi-channel broadcast and virtual networks. The smooth implementation of this function is due to the addition of dedicated integrated circuits (ASIC, the traditional instruction from software processing is changed to the embedded instruction of ASIC chip, thus accelerating packet forwarding and filtering, this ensures high-speed linear routing and service quality. Currently, if you do not need a wide area network, you will no longer use vrouters that are expensive and have limited bandwidth in the network creation solution.

Virtual LAN technology

The development of exchange technology allows geographically dispersed organizations to logically become a new working group, and members of the same working group can change their physical addresses without reconfiguration of nodes, this is the so-called VLAN technology ). Using a LAN switch to build a virtual network is to divide the logic of the original large broadcast area (all ports of the switch) into several "subbroadcast areas ", the broadcast packets in the subbroadcast area are only transmitted in the broadcast area, but cannot be received in other broadcast areas. VLAN uses the exchange technology to effectively separate the traffic, so as to better utilize the bandwidth, and logically split the actual LAN infrastructure into multiple subnets, it allows various local networks to run different application protocols and topologies. For more information, see the rules.

LAN switch Maintenance

LAN switch introduction <> brief st6000 series introduction <> brief st5000 series introduction <> basic maintenance commands for the wide st6000 series and wide st5000 series.

Overview of LAN switches

LAN switches have evolved from a HUB-based LAN shared in the traditional sense to a broader space. Take Cisco's ipvst5000 series LAN switch as an example. It includes an integrated switching hardware structure, 10-Mbps Ethernet that supports switching, and-Mbps Fast Ethernet, supports fast Ethernet, FDDI, exchange-type ring, and layer-3 switching processing. This type of switch can provide exchange access to workstations, servers, network segments, backbone networks, or other users in the LAN.

CiscoIOS software provides advanced network services for Catalyst platforms and network applications. CiscoIOS technology is optimized for switching and can be used for all Catalyst switches, including FastEtherChannel Technology for bandwidth sets; Cisco group management protocol support for multi-point transfer and multimedia traffic performance is optimized; and extensive management features. CiscoIOS also supports VLAN configuration and management, IP address management, and secure network service access.

Introduction to the Catalyst6000 Series

The hybrid st6000 family includes the hybrid st6500 series and hybrid st6000 series, providing a series of new high-performance multi-layer switching solutions for campus networks. The ikest6000 family is designed to meet the increasing requirements for gigabit scalability, high availability, and multi-layer switching in Backbone Network/distribution and server collection environments, providing excellent scalability and cost effectiveness, supports a wide range of interface density, performance, and high availability options. By providing Application Intelligence, service quality mechanisms, and security, customers can use their networks more effectively to increase customer services (such as multi-point transmission and ERP applications) without sacrificing network performance. In combination with a wide range of CiscoIOS network services, the Catalyst6000 family provides powerful management, user mobility, security, high availability, and multimedia support for the enterprise intranet.
Introduction to the Catalyst5000 Series

In addition to ipvst5000, Cisco's ipvst5000 series switches also include four models, including ipvst5002, rjst5500, rjst5505, and rjst5509. They are all enhanced models of ipvst5000. The old device used in this project is the ipvst5509 switch. Taking mongost5509 as an example, there are a total of nine slots in the rack. The first slot is used in the SupervisorEngine module, which provides layer-4 switching and remote network management, the module has dual-port and full-duplex Fast Ethernet interfaces. The maximum speed of Mbps can be used to connect other ipvst5000, routers and servers. The second slot is the SupervisorEngine module used for backup. The other seven slots can be used in combination to configure any Switching Module and Routing Switching Module RSM ). The Catalyst5509 chassis is suitable for mounting to standard 19 inch racks. All system components can be operated on the same side of the chassis. One power supply must be configured for a complete system. For fault tolerance, you can select Dual Backup, Server Load balancer, and power supply that supports live plugging.

Basic Maintenance for the Catalyst6000 series and the Catalyst5000 Series

The wide st6000 series and wide st5000 series LAN switches provide powerful functions, including many usage and maintenance commands. Below are several common commands and simple descriptions. For all maintenance commands, see the related manual provided with the hardware device.