vlans and trunks

The experimental topology is as follows: First, understand the principle of single arm routing 1. LINK Type The connection between the PC and the switch is the access layer, so the access link is used, but VLAN10 and VLAN20 need to communicate

Configure Cisco's three-tier switch to enable different VLAN hosts to communicate with each other, and understand how the three-tier switch works Configuring DHCP relay on Cisco's three-tier switch Configure the routing interface on Cisco's

The principle of three-layer exchange and the principle of DHCP, the author here is not explained in detail, here through a case to understand the use of three-tier exchange to do DHCP server, and for different network segments assigned IP address.

Experiment topology: 1. Configure the PC IP address and Gateway (abbreviated) 2. Create the VLAN on the switch and add the interface to the appropriate VLAN En Conf t VLAN 10 VLAN 20 Exit int F0/1 Switchport mode access Swithchport

Access-list110denytcpanyanyrang135139access-list110denytcpanyanyeq445access-list110denytcpanyanyeq593access-list110denytcpanyanyeq1029access-list110denytcpanyanyeq4444access-list110denytcpanyan Access-list 110 deny tcp any rang 135 139 access-list 11

Step 1: Create vlan10, vlan20, and vlan30S5750 # conf ---- enter global configuration mode S5750 (config) # VLAN 10 ---- create VLAN10S5750 (config-vlan) # exit ---- exit VLAN configuration mode S5750 (config) # vlan 20 ---- create VLAN20S5750

In a LAN, the finance department (vlan1) and the Sales Department (vlan2) are prohibited from communicating with each other, but they can all access the sever server (vlan3) so that they can share files on the server.  Switch>Switch> enaSwitch #

This experiment needs: By planning VLAN 100 and VLAN 200 in Cisco Catalyst 3550来, and configuring DHCP to have the VLAN100 personnel computer obtain an IP address for 192.168.0.0/ 24, let VLAN200 market computer to obtain IP address for 172.16.0.0/2

Virtual LAN VLANThe concept of VLANs In the traditional switched Ethernet, all users in the same broadcast domain, when the network size is larger, the number of broadcast packets will increase significantly, when the number of broadcast packets to 30% of the total amount of time, the network transmission efficiency will be significantly reduced, especially when the network equipment failure, and constantly send broadcasts to the network, Whi

area network). VLANs work in the data link layer of the OSI Reference Model, where a VLAN is a switched network in which all users are in the same broadcast domain and each VLAN communicates through a routed device connection.Benefits of using VLAN technology:1. controlling the broadcast2. Enhance network security3. Simplify network managementn types of VLANs1. static VLANStatic VLANs, also known as Port-

I. layer-3 switches-use layer-3 switches to implement VLAN division and IP routing between VLANs VLAN Division In the Internet cafe environment, many netusers use a variety of software: games, QQ, video communication, browsers, during communication, these applications will generate numerous data packets transmitted both in and out of the network. This transmission is based on the broadcast mechanism in the LAN switch en

, the modes of these channels include on, off, auto, and desirable. The port that makes up the channel should be a continuous port. The configuration is as follows:Console> (enable) set port channel mod_num/ports {on | off | auto |Desirable}Console> (enable) show port channel3. STP Configuration:In 5505, the default STP configuration is activated, and you can only enable or disable all VLANs, but not for a certain VLAN. By setting the priority of each

an exclusive high bandwidth; 2. The TRUNK function is used for cascade between switches. By sacrificing the number of ports, it provides bundled high bandwidth for data exchange between switches, improving the network speed and breaking through the communication bottleneck between switches, this greatly improves network performance. In order to reduce the total cost of ownership, TUNK technology can be used in the solution to achieve cascade between switches, rather than directly using Gigabit

this mirrored VLAN is forwarded to all VLAN trunks, resulting in a waste of network bandwidth, so VLAN pruning (pruning) is configured, and Rspan can mirror VLANs.(1) Create a Rspan source port on the source switch* * Same span or Vspan(2) Create Vspan reflection port and destination VLAN on the source switchMonitor session session_number destination remote VLAN Vlan-id Reflector-port interface**vlan-id VL

Layer-3 switches have become an indispensable part of networking equipment. Here we analyze the solution of layer-3 switches in Internet cafes. In the Internet cafe environment, many netshers use a variety of software: games, QQ, video communication, and browsers. These applications will generate numerous data packets for communication between the Internet and the Internet, this transmission is based on the broadcast mechanism in the LAN switch environment, so it will generate an inevitable broa

that you use devices of the same brand as much as possible. We recommend that you use the same or mutually supported models/series at the same level. The advantage is to ensure the compatibility of the vswitch configuration function and give full play to the functions and features of the corresponding brand. Because different brands, even different series or models, support for functions, or the types of communication protocols implemented are not exactly the same. Finally, make full use of exi

; /* Key supplied by ofproto's client. */ char *name; /* Identifier for log messages. */ /* Configuration. */ struct list ports; /* Contains "struct ofport"s. */ enum port_vlan_mode vlan_mode; /* VLAN mode */ int vlan; /* -1=trunk port, else a 12-bit VLAN ID. */ unsigned long *trunks; /* Bitmap of trunked VLANs, if 'vlan' == -1. * NULL if all

Required knowledge:First, we should understand Catalsty 4908G-L3. In fact, it is a vro that uses the cisco ios configuration interface completely. By default, all interfaces are routable interfaces. Catalsty 4908G-L3 does not support L2 protocol, VLAN trunk protocol, dynamic trunk protocol, and port aggregation protocol. Catalsty 4908 does not support the following types: IOS 12.07-based1. Access Control List.2 802.1q3 apple talk routing4 port snoopingCatalsty 4908 swtich-router running Cisco IO

Aggregation Control Protocol). The protocol was transferred to IEEE 802.1ax as a standard in 2008, and LACP can dynamically configure port aggregation without relying on any vendor, so most Ethernet switches support the protocol.Typically, a parallel aggregation/binding is created between switches using multiple ports, and the Spanning Tree Protocol (STP) treats it as a loop, and technically, the link aggregation technique solves the problem by enabling the aggregation port to generate a single

Today, we introduce some common basic operations of Cisco devices, such as creating VLANs, binding network cables, doing trunks, using three-layer switching, and so on.This is today's topology diagram: Two three-layer switching, two PCs, respectively, add vlan10 and 20, two three layers to do network redundancy, and finally achieve two PC communication, very simple, but the use of an experiment:650) this.wi