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The Cisco layer-3 switch is another core switch developed by Cisco. It aggregates the bandwidth of the backboard of the switch that is stacked together, in this way, the total backplane
A typical LAN is to connect a core switch with a layer-3 Switch to several Branch switches (not necessarily with layer-3 switching ). We assume that the core switch name is com, and the
Layer-3 Switch for Cisco switches
Although single-arm routing solves the communication problem between different VLANs, it also has its fatal defects:
-The single arm itself is the Backbone link of the network, which is easy to form a network bottleneck.
-The sub-interface relies on physical interfaces, and the applic
[Cisco] DHCP relay, layer-3 Switch VLAN Routing PracticeThe experiment topology uses the GNS3 0.8.6 simulator to build a DHCP server using Red Hat 6.5. The experiment requires configuring a layer-3
computer system at the receiving end to determine the type of the IP packet it receives and hand it over to the appropriate high-levelSoftware. The combination of the port number and the IP address of the device is usually called "socket )".
The port numbers between 1 and 255 are retained. They are called "well-known" ports, that is, these ports are the same in all TCP/I P protocol stack implementations of the host. In addition to the "well-known" port, standard UNIX services are allocated betw
Simply put: Layer-1 switchOnly physical layer protocols are supported (one phone-controlled switch can be called ???)L2 SwitchSupports physical layer and data link layer protocols, such as Ethernet switches.L3 SwitchSupports physical
, routers can master the topology of the whole network. Link state broadcast is another kind of information passed between routers, it can send the information to the sender of the link state and notify the other routers.
3. Three-layer switching technology
A third-tier switching device is a second layer switch with
High intelligence, high availability, and high reliability are the characteristics of multi-layer intelligent optical fiber switch. Although its technology is not very mature yet, it has been recognized by people. Cisco Systems recently announced that it will launch the CiscoMDS9100 series of multi-layer smart Optical
Example:
3026
2012
5012. The value of 2nd bits is 0 ~ 4 indicates that it is a layer-2 switch.
3550. The fifth digit is 5 ~ 9 indicates that it is a layer-3 switch.
LI (LitesoftwareImage) indicates that the device is a weak feature version.
SI (StandardsoftwareImage) i
1,Layer-3 forwardingYesRoute information is requiredThe route selection in the forwarding process determines the final egress of the message,L3 SwitchJust put thisRoute functions are integrated into the switch ChipGo.
2,Route SelectionExistExact matchAndLongest matchTwo methods.
2.1,Exact matchThat is, the destination IP address and the route address information
First, network description
The PC1 is connected to the Cisco3550 F0/1 and the rate is 100M;
CISCO3550 's G0/1 for export.
Second, the detailed configuration process
Note: This configuration: Improve the reprint of some of the incorrect configuration.
Each interface supports only one policy in each direction, and one policy can be used for multiple interfaces. Therefore, the download rate limit for all PCs should be defined in the same policy (in this case, Policy-map User-down), while the d
; (enable) Set MLS include Rp_ip_address tells the switch which IP address is correct6500> (enable) Show MLS include displays a list of IP addresses for the external routing processor6500> (enable) Set MLS flow [Destination|destination-source|full] tells the MLS switch what information to cache the candidate packets6500> (enable) Show MLS entry show third-tier ca
capability of a single board, it does not mean the overall forwarding capability of multiple boards in Distributed forwarding situations, nor does it include GSR consisting of expensive network processors. In addition, a higher-speed CPU is now available, but it is hard to exceed 1 mpps3 ).
The high price of the network processor lies in its complexity in addition to layer-
data forwarded at this layer is basically "pure ", therefore, it is necessary to ensure high-speed data forwarding. Because it is a convergence layer, the port overwriting status of this layer is almost never met. Unless a access layer switch is damaged, a medium aggregatio
downstream interfaceLimit rate speed, calculated as follows:assuming that 2960 is the port, so the simple set speed limit is*15=720 Note: IP DHCP snooping limit rate needs to be set only if the DHCP snooping converged switch or core is enabled. If there is a large number of access layer switches under a core or aggregation switch, the speed limit setting needs
know that in order to cope with the increasing data traffic, shared media networks have been replaced by switching networks. This change has a direct impact on the traditional routers used for network segmentation. In view of the large traffic that spans the IP address or IPX subnet, the router has actually become the bottleneck of network transmission. The reason is that traditional routers focus more on multiple media types and transmission speeds. Currently, data buffering and conversion cap
/100 Mpbs adaptive ports and 1 Gigabit expansion slot. You can purchase different types of Gigabit modules provided by youkang to achieve the function of connecting to a gigabit network. The UGS-7324RS has 15 Gbps non-blocking back-board bandwidth, in the layer-2 switch, the packet forwarding rate reaches the line speed value of Fast Ethernet; As a layer-
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