What is the Hot Standby Router Protocol (HSRP)

Summarize of the HSRP

HSRP (Hot Standby Router Protocol): is a Cisco WS-C2960S-48FPS-L Price proprietary, it ensures that the network edge device or access link fails, the user can quickly recover and transparentcommunication, providing redundancy for the IP network. Hot standby routing protocol for the IP network to provide fault tolerance and enhanced routing function. By using a virtual IPaddress and the virtual MAC address, LAN segment of two or more router can act as a virtual router providing service.

Group members of the HSRP 

HSRP backup is a backup active router, a router, a virtual router to other routers.

The active router: the main function is to the virtual router packet forwarding. Another routerin the group is selected as the backup router. The active router by sending Hello messages to take and keep it active role.

Backup router: as long as the function is to monitor the operation of the HSRP group, and to the active router cannot run, quickly assume packet forwarding responsibility. Backup routercan transmit Hello message, inform the role and state change all routers in the backup router group.

Virtual Router: the main function is to the end user with a continuous working router. Virtual router configuration has its own IP address and MAC address, but not the actual packet forwarding.

Other routers: these routers to monitor the Hello message, but no response. The routerforwarding any through their packets, but not through the virtual router packet forwarding.

The principle of the HSRP

Each router in the HSRP group has the specified priority, priority degree evaluation forrouters in the active router selection in. The default priority 100 (configurable range 0-255),group of highest priority router will become the active router, then the backup router. When the priority under the same conditions, the router LAN port IP address, the address will become the active router.

When the terminal users to submit data to the virtual router, will be processed by the active router, when the active router fails, the backup router will assume the active router work in seconds, then the backup became active router, and the backup router vacancies within the group, other routers will be promoted backup router, in time select the backup router priority.

More information, please view: http://www.3anetwork.com

Cisco 2960 WS-C2960S-24TD-L: US$1,595.00 and datasheet

Cisco 2960 WS-C2960S-24TD-L list price: US3795.00, according to our research on WS-C2960S-24TD-L Price, the best price is from, http://www.3anetwork.com/cisco-ws-c2960s-24td-l-price_p10.html, US$1,595.00, You Save: US$2200.00 (58% off)

Product type: Gigabit Ethernet switch in application level: two layer transmission rate:10/100/1000Mbps port number: 26 backplane bandwidth: 88Gbps VLAN: the maximum VLAN number: 255 V packet forwarding rate: 65.5Mpps network standard: IEEE 802.1D, IEEE portstructure: non modular exchange: store and forward product memory: memory DRAM:128MBQOS: cross stacking QoS 802.1p

The Cisco Catalyst 2960-S Series Switches WS-C2960S-24TD-L Price are fixed-configuration Gigabit Ethernet switches that provide enterprise-class Layer 2 switching for campus and branch access applications. They enable reliable and secure business operations with lower total cost of ownership through a range of innovative features including FlexStack, Power over Ethernet Plus (PoE+), and Cisco Catalyst SmartOperations.

More information, please view: http://www.3anetwork.com

Modify the switch parameters through the Web browser

When using Console for switch set IP address WS-C2960-24PC-L  information and enable the HTTP service, you can access the switch by supporting the JAVA Web browser, all kinds of parameters, and through the Web browser through the modification of switches and manage the switch. In fact, through the Web interface, can be many important parameters of the switch to modify and settings, and running state real-time view switch. But before the access switches useWeb browser, shall confirm the already prepared to do the following work:

EXT-INDENT: 2em "> in for the installation of TCP / IP protocol management computer, and in the computer and managed switches has been configured IP address information.

· to support JAVA installation management computer in the Web browser, such as InternetExplorer version 4 and above, Netscape version 4 and above, and Oprea with JAVA.

· in managed switches built with admin user account and password.

· managed switch Cisco IOS support for HTTP services, and has enabled this service.Otherwise, we should upgrade the Cisco IOS through the Console port or HTTP enabledservices.

By way of a Web browser configuration methods are as follows:

The first step: the computer is connected to a common port of the switch, running the Webbrowser on the computer. Managed switch IP address type in the browser "address" field(such as 61.159.62.182) or for the name of the specified. Click the enter button, the pop-updialog box as shown below.

The second step: in the "username" and "password" box, type the user name and passwordwith management authority. The username / password to advance through the Console portsettings.

Step third: click the "set" button, you can establish a connection with the managed switch,display switch management interface in the Web browser. As shown in the following illustration page with Cisco Catalyst 1900 after the connection is established, displayed in a Web browser configuration interface. First of all to see is required to enter a user ID and password, then you enter in the above set has a good switch configuration super user account and password to enter the system.

Next, you can through the Web interface tips, various parameters and running step by stepcheck switch, and can make the necessary WS-C2960-48PST-L Price changes to some parameters of the switch.

more: http://cisco2960switch.centerblog.net/

Cisco 2960: IOS backup setting

The first step, download a TFTP server, Cisco 3750X using Cisco TFTP Server on the line, free, small volume, has finished. Start TFTPServer.exe, and the root directory of the TFTP server for the specified to the directory change option, such as "D:CISCO\IOS", keep it open.

The second step, with twisted pair 2960 access network (if you have used in the network,skip this step) or with computer directly connected, and then control line connecting 2960 console port and computer serial port 1, connection terminal software function with the XMODEM Win2003 or XP (super terminal with this function, such as just a simple backup,XMODEM is not essential.).

The third step, a computer network with the same 2960 IP address, PING test passed, thenin 2960 should be able to see the computer's MAC, to ensure the communication between2960 and the normal computer.

Switch#en

Switch#conf t

Switch (config) #inter VLAN 1

Switch (config-if) #ip addr 172.16.1.100 255.255.255.0

Switch# sh run

......

Interface Vlan1  

IP address 172.16.1.100 255.255.255.0

No IP route-cache

......

End

Switch#ping 172.16.1.10

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 172.16.1.10, timeout is 2 seconds:

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 MS

Switch#sh IP ARP

Protocol Address Age (min) Hardware Addr Type Interface

Internet 172.16.1.10 1 00a0.d1b4.5bd8 ARPA Vlan1

Internet 172.16.1.100 - 0023.34b2.5f40 ARPA Vlan1

The fourth step, check the current IOS information 2960.

Switch#sh flash:

Directory of flash:/

2 -rwx 1232 Mar 11993 00:41:41 +00:00 config.text

3 -rwx 5 Mar 11993 00:41:41 +00:00 private-config.text

7 drwx 192 Mar 11993 00:10:03 +00:00 c2960-lanbase-mz.122-35.SE5

32514048 bytes total (24178176 bytes free)

From the file attributes (the scarlet letter part) can be seen in the c2960-lanbase-mz.122-35.SE5 is a directory.

According to the experience, the IOS file name should be c2960-lanbase-mz.122-35.SE5.bin

The full path for the flash:c2960-lanbase-mz.122-35.SE5/c2960-lanbase-mz.122-35.SE5.bin

Write down this path information.

The fifth step, the TFTP server root directory IOS to the computer, the backup process.

Switch#copy flash: tftp:

Source filename c2960-lanbase-mz.122-35.SE5/c2960-lanbase-mz.122-35.SE5.bin []?

Address or name of remote host 172.16.1.10 []?

Destination filename [c2960-lanbase-mz.122-35.SE5.bin] (enter)?

5222733 bytes copied in 10.905 secs (478930 bytes/sec)

TFTP server root directory of computer examination, confirm file already exists.

Here, CISCO 2960 IOS backup is complete.

Note: this method is suitable for most of CISCO devices, such as routers etc..

More information, please view: http://www.3anetwork.com

Fault processing methods of the Cisco switches and Cisco routers

Fault processing method

One, network complexity

The general network, dial, including video, cisco aironet 1530 price (ISDN, WAN, frame relay, ATM,... ), LAN, VLAN,...

Two, failure model

1, the definition of the problem (Define the Problem)

Detailed and accurate description of fault symptoms and potential causes

2, collecting detailed information (Gather Facts) R> source of information: the key to the user, the network management system, the router / machine

1) identify symptoms:

2) to reproduce the fault: check the fault still exists

3) to investigate the failure frequency:

4) range to determine the fault: there are three kinds of methods to establish the scope of fault

From the outside to inside? Treatment failure (Outside-In Troubleshooting): generally applicable to a plurality of host can not be connected to one or a set

1,from the inside to the outside fault treatment (Inside-Out Troubleshooting):

2,half fault treatment (Divide-by-Half Troubleshooting)

3,consider possibilities (Consider Possibilities) to consider possible reasons causing thefailureset up a plan of action (Create the Action Plan)

4,implement the action plan (Implement the Action Plan)

5,Is used to correct the cause of network fault. From the fault source, come up with treatmentfor each completed step, check whether the failure to solve

6, observe the action plan execution result (Observe Results)

7, if the action plan will not solve the problem, repeat the above process (Iterate as Needed)

Three, record the changes

In the plan of action to solve the problem, the part of the record as the fault processing,recording all the configuration changes.

The second chapter web documents

A, network baseline

The simplest way to solve network problems is the current configuration and the previous configuration compared.

Baseline document consists of a network and system documents is different, it includes:

Network configuration table?

Network topology?

The ES network configuration table?

ES network topology?

Considerations for creating a network:

1) to determine the scope of the document;

2) remain the same: the same information collection of all equipment in the network;

3) clear goal: to understand the use of the document;

4) documents are easy to use and asa5555-2ssd120-k9 access;

5) timely update the document.

more:

http://jkemma990.wordpress.com/

The parameter of Cisco Catalyst 2960

Backplane bandwidth: 32Gbps ws-c2960s-48fps-l

Exchange: exchange and storage

Port type: 10/100/1000 Ethernet ports and a small form factor pluggable (SFP) Gigabit Ethernet port

Port number: 20

The support rate: 10Mbps/100Mbps/1000Mbps

The stack is not supported

Modular slot number: 2/4

Network standard or specification: IEEE 802.3 10BASE-T Ethernet

IEEE 802.3u 100BASE-TX Fast Ethernet

IEEE 802.3ab 1000BASE-T Gigabit Ethernet

IEEE 802.3z Gigabit Ethernet (optical fiber)

ANSI/IEEE 802.3 NWay automated negotiation

IEEE 802.3x flow control

Support the network management 

The network management function or protocol: SNMP V1, V2C and V3, and the Telnet interface support, can provide with internal management in an all-round way

Support full duplex

Support the VLAN 

The MAC address table: 12K

The power supply voltage: 220V

Power 370W

Working temperature: 0-45 ℃

Work humidity: 10-90%

Intelligent Gigabit switch feature labels

The application level of enterprise

Protocol layer two layer

Network coverage LAN switches

The transmission speed of Gigabit

Cisco Catalyst 2960 and 2960-S switches are the leading fixed-configuration Layer 2 edge access switches, 2960 is FE access switch while 2960-S most ports are GE. The Catalyst 2960-S Series Switches are stackable switches and support POE+ function. 3Anetwork.com keeps stock for most 2960 and 2960-S LAN base switches. Among all Cisco Catalyst 2960 switches, WS-C2960-24TT-L and WS-C2960-24TC-L are best selling models. Among all Cisco Catalyst 2960S switches, WS-C2960S-24TS-L and WS-C2960S-48TS-L are best selling models. 3Anetwork.com offers best Cisco 2960 Price, Cisco 2960S (2960-S) Price, ws-c3560x-48p-s ship to worldwide. 

More: http://www.3anetwork.com