Switch vropk and layer-3 vswitch primary key

Currently, exchange routers are widely used. Many people may not understand the differences and connections between layer-3 switches and exchange routers. It does not matter. After reading this article, you will certainly have a lot of GAINS, I hope this article will teach you more things. In recent years, with the rapid development of Internet/Intranet and the wide application of the B/S computing model, cross-region and cross-network business has increased dramatically, the industry and users are deeply aware of the bottleneck effect of traditional exchange routers in the network.

A layer-3 switch can operate on the layer-3 of the network protocol and act as a route. It has a speed that almost achieves layer-2 switching, and the price is relatively low. At that time, layer-3 switches will replace switches as the most popular topic in the network field. But is that true? Traditional exchange routers have routing forwarding, firewall, and broadcast isolation functions in the network. In a network with VLAN division, logically, communication between different CIDR blocks still needs to be forwarded through the exchange router.

Because the data volume of communication between different VLANs is large on the LAN, if the exchange router needs to route each packet once, it will become a bottleneck as the data volume on the network increases. The third-layer exchange technology combines the routing and switching technologies. After routing the first data stream, it will generate a ing table between the MAC address and IP address. When the same data stream passes through again, the table is directly routed from the second layer instead of the second layer, which eliminates the network delay caused by the routing selection of the Switch Router and improves the efficiency of packet forwarding.

Router forwarding adopts the longest matching method, which is complicated and usually implemented by software. Layer-3 Switch routing lookup is targeted at the stream. It uses the CACHE technology and is easy to implement using ASIC. Therefore, it can greatly save costs and achieve fast forwarding. However, technically speaking, there are significant differences between the exchange router and the layer-3 Switch in Packet Exchange operations. Generally, a vro performs Packet Exchange Based on a microprocessor, while a layer-3 Switch performs Packet Exchange through hardware. Therefore, compared with a layer-3 Switch, vro features are more powerful, and functions such as NAT and VPN cannot be completely replaced. Exchange

The interconnection of subnets in the same LAN can be replaced by a layer-3 switch, but the lan must be interconnected with the public network to achieve cross-regional network. In this case, the exchange router is indispensable. A network fully built on a vswitch may have problems such as collision, congestion, and communication confusion. Vswitches are used to divide the network into multiple subnets. These problems can be avoided by effectively implementing security control policies based on the functions of routes.

A layer-3 Switch cannot provide a complete routing protocol, while a Switch Router can process multiple protocols at the same time. When a network is connected to different protocols, such as a combination of Ethernet and card rings, it is impossible to transmit data between networks by using a layer-3 switch. In addition, vrouters also have layer-4 network management capabilities, which are not available in layer-3 vswitches. Therefore, a layer-3 switch is not equal to a vro and cannot completely replace a vswitch.