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Several common causes of err-disable on the vswitch interface: Reference 1. EtherChannel misconfiguration 2. Duplex mismatch 3. BPDU port guard 4. UDLD 5. Link-flap error 6. Loopback error 7. Port security violation The first one will show

In an exchange network, how do you determine where to start searching for problems? It is very difficult to look into a "Perspective" exchange network. First, the two-layer switch still uses the bridging forwarding method, but the three-layer switch

Network administrators of various companies carefully select network devices and conduct repeated research between different vendors of the same level. After multiple comparisons, they can select the most cost-effective products. However, many

Use vswitch security measures: Build a strict architecture and master the following knowledge points of vswitch security measures. You only need to spend a few minutes to learn about vswitch security measures. Many security issues will also be

A rstp fault Early in the morning, I received a call and the ping gateway to the direct connection failed. No interface arp table for dis ARP Dis mac-address without related interfaces It seems that there are only physical problems, but it is said

Set the host name/system name on the IOS-based switch:Switch (config) # hostnameSet the host name/system name on the CLI-based switch:Switch (enable) set system name-string2. Set the logon password on the IOS-based switch:Switch (config) # enable

CISCO 6509 core switch WS-C6509-1300AC = Catalyst 6509 Chassis w/1300 w ac Power SupplyRedundant Power WS-CAC-1300W/2 Catalyst 6000 Second 1300 w ac Power SupplySwitch Engine WS-X6K-S2-MSFC2 Catalyst 6500 Supervisor Engine-2, 2GE, plus

Configure the switch IP address of Catalyst 3524Directly go to the default VLAN 1 and configure the command as follows:Interface VLAN1Ip address 172.16.1.3 255.255.255.0.0You can.Control Telnet access in CatalystBluestudy_a (config) # access-list 2

Virtual lan vlan) not only facilitates network security and prevents network storms, but also improves network operation efficiency and solves many other problems. The popularization of layer-3 switches creates conditions for VLAN applications. In

Recently, I have participated in many discussion and evaluation activities on hospital network solutions. Almost all hospital solutions use VLAN technology, however, I found that VLAN design in most solutions has a common and fatal defect, that is,

Abstract: In large Campus Networks, VLAN technology has been widely used. In the network applications with the rapid development of multimedia technology, inter-VLAN communication has become increasingly important, however, no unified communication

Nowadays, vrouters have become mature products, but new technologies are still emerging. The current mainstream vro technologies include the following: ADSL Access and PPPoE Asyuncrical Data Subscriber Line (ADSL) is a broadband access technology.

Carriers are integrating IP and optical network technologies to improve service efficiency and develop advanced services. But first, they need to overcome extremely complex multi-layer architecture. This architecture is "poorly pieced together to

The first is the common port sealing method: the Common commands are as follows:1 forbidden:Access-list 102 deny tcp any range 6881 6890Access-list 102 deny tcp any range 6881 6890 anyAccess-list 102 permit ip anyThis method has its own limitations.

When we purchase wireless products, we will refer to the transmission speed in the product parameters, but we do not know that there is something to circle. Let's take a look at the knowledge about the actual wireless transmission speed and

The use of wireless networks is very convenient, so there are more and more wireless hotspots. There are also many problems. In areas covered by wireless hotspots, users can access the Internet by using laptops and PDAs with built-in or external

When planning a wireless network for installation, you must carefully assess and solve the risks. Otherwise, unforeseen problems such as radio frequency interference, poor performance, and security vulnerabilities will cause disasters. By

WiredNetworkMonitoringThe advantage is low transmission costs, high network bandwidth, and good transmission performance, but it cannot meet the monitoring needs of the mobile industry.3G wirelessThe advantage of monitoring is that it can implement

The popularity of mobile devices has increased the demand for Wi-Fi for branch networks. Even if a company with a wide range of branches does not need to deploy wireless networks in hundreds of locations, it needs to deploy branches in dozens of

The upcoming 802.11ac standard, also known as "Gigabit Wi-Fi", has greatly improved the 802.11n, with the aim of significantly improving the data transmission speed, it also applies Wi-Fi to new fields, such as HD video transmission. The Enterprise 1