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The store-and-forward mode is the most widely used method in the field of computer networks. It stores the data packets of the input port first and then performs CRC check. After processing the error packet, the destination address of the data packet is taken out and converted into an output port through a lookup table. Send the package.
For this reason, the store-and-forward method has a large delay in the data processing. This is its shortcoming. It can detect errors in packets entering the LAN switch. It is especially important that it can support input and output ports of different speeds. The conversion keeps the high-speed port and the low-speed port working together.
Layer 2 and Layer 3 switching and their competition with router solutions
The LAN switch works on the second layer of OSI and can be understood as a multi-port bridge. Therefore, it is traditionally called Layer 2 switching. Currently, switching technology has been extended to some functions of the third layer of OSI, the so-called third layer. Exchange, the third layer exchange cannot spread the broadcast packet, directly use the dynamically established MAC address to communicate, it seems to be able to understand the third layer of information, such as IP address, ARP, etc., with multi-channel broadcast and virtual network based on IP The routing function of the protocol such as IPX, the smooth implementation of this function is due to the addition of the application-specific integrated circuit (ASIC), and the traditional software-processed instructions are changed to the embedded instructions of the ASIC chip, thereby accelerating the forwarding of the packet and Filtering ensures reliable linear routing and quality of service at high speeds. At present, if there is no need for a wide area network, routers with expensive and limited bandwidth are generally not used in the network construction scheme.
Virtual local area network technology
The development of switching technology allows a geographically dispersed organization to logically become a new working group, and members of the same working group can change their physical addresses without having to reconfigure the nodes, which is the so-called Virtual Local Area Network (VLAN). To establish a virtual network with a LAN switch is to divide the original large broadcast area (all ports of the switch) into several "sub-broadcast areas". The broadcast packets in the sub-broadcast area will only be transmitted in the broadcast area. The broadcast area is not available. VLANs effectively separate traffic by switching technology to better utilize bandwidth and logically partition the actual LAN infrastructure into multiple subnets, allowing different LANs to run different application protocols and topologies. Readers interested in this part of the details can refer to the IEEE802.10 regulations.
LAN switch maintenance
Introduction to LAN Switch <> Introduction to Catalyst6000 Series <> Introduction to Catalyst5000 Series <> Basic Maintenance Commands for Catalyst 6000 Series and Catalyst 5000 Series.
Overview of LAN switches
LAN switches have evolved from a traditionally shared HUB-type LAN to a broader space. Take Cisco's Catalyst 5000 series LAN switch as an example. It includes an integrated switching hardware structure that supports switched 10-Mbps Ethernet and 100-Mbps Fast Ethernet through Fast Ethernet, FDDI, and switched Token Ring. Exchange processing power with Layer 3. This type of switch provides switched access to workstations, servers, network segments, backbone networks, or other users within the LAN.
Cisco IOS Software provides advanced network services for the Catalyst platform and web applications. Cisco IOS technology is optimized for switching and can be used with all Catalyst switches, including FastEtherChannel technology for bandwidth aggregation; Cisco Group Management Protocol support for optimized multicast and multimedia traffic performance; and extensive management features. Cisco IOS Software also supports virtual local area network (VLAN) configuration and management, IP address management, and secure network service access.
Introduction to the Catalyst 6000 Series
The Catalyst 6000 family includes the Catalyst 6500 Series and the Catalyst 6000 Series, providing a new range of high-performance multilayer switching solutions for campus networks. Designed to meet the growing demand for gigabit scalability, high availability, and multi-layer switching in a backbone/distribution and server aggregation environment, the Catalyst6000 family delivers superior scalability and price/performance, supporting a wide range of interface densities, performance, and high Availability options. By providing application intelligence, quality of service mechanisms, and security, customers can more effectively leverage their networks to add customer services (such as multicast and ERP applications) without sacrificing network performance. When combined with Cisco IOS' extensive network services, the Catalyst 6000 family delivers the powerful management, user mobility, security, high availability and multimedia support required for enterprise intranets.
Introduction to the Catalyst 5000 Series
In addition to the Catalyst 5000, Cisco's Catalyst 5000 series switches include the Catalyst 5002, Catalyst 5500, Catalyst 5505, and Catalyst 5509, all of which are enhanced by the Catalyst 5000. The old equipment in this project is a Catalyst 5509 switch. Taking the usual Catalyst 5509 as an example, the Catalyst 5509 rack has 9 slots. The first slot is used for the supervisor engine module. This module provides Layer 2 switching and remote network management. The module has dual-port, full-duplex fast Ethernet. Network interface. You can connect to other Catalyst5000s, routers, and servers at the highest rate of 400Mbps; the second slot is the supervisor engine module for plugging in backups. The other seven slots can be used to combine any switch module and Route Switch Module (RSM). The Catalyst 5509 chassis fit into a standard 19-inch rack. All system components can be operated on the same side of the chassis. A complete system must be configured with a power supply. For fault tolerance, dual backup, load balancing, and power pluggable power supplies are available.
Basic maintenance of Catalyst 6000 series and Catalyst 5000 series
The Catalyst 6000 Series and Catalyst 5000 Series LAN Switches are powerful, including many usage and maintenance commands. Below, list a few commonly used commands and a brief description. Please refer to the relevant manual provided with the hardware device for all relevant maintenance commands.
