Configuration and maintenance of Cisco2620 vro

1. Initial installation

During the first installation, the system automatically enters the Dialog Setup, as prompted on the screen, answer the router name, encrypted super login password, super login password, remote login password, dynamic routing protocol, and the configuration of each interface, and save the configuration. After the vro name appears, run the enable command and enter the super logon password. If the vro name appears, the name is Cisco2620. After the Cisco2620 # prompt is displayed, the vro mode is enabled, now you can configure the vro.

2. Configure the vro

Type config terminal. The prompt Cisco2620 (config) # appears to enter the configuration mode.

(1) set the password

Cisco2620 (config) # enable secret 123123: Set the privileged mode password to 123123

Cisco2620 (config) # line console 0: Enter the Console port configuration mode

Cisco2620 (config-line) # password 123123: Set the Console port password to 123123

Cisco2620 (config-line) # login: Make the console port configuration take effect

Cisco2620 (config-line) # line vty 0 5: Switch to remote logon Port

Cisco2620 (config-line) # password 123123: Set the remote logon password to 123123

Cisco2620 (config-line) # login: Make the configuration take effect

(2) Set a Fast Ethernet port

Cisco2620 (config) # interface fastFastethernet 0/0: enter the port configuration mode

Cisco2620 (config-if) # ip address 192.168.1.6 255.255.255.0: Set the ip address and mask

Cisco2620 (config-if) # no shutdown: Enable the port

Cisco2620 (config-if) # exit: exit from Port Configuration Mode

(3) set Synchronous Serial Port

Cisco2620 (config) # interface serial 0/0: Enter Synchronous serial Port Settings

Cisco2620 (config-if) # ip unnumbered fastFastethernet 0/0: Synchronous Serial Port uses the same ip address as the fast Ethernet port

Cisco2620 (config-if) # encapsulation ppp: sets the data link layer protocol as PPP.

(4) set up the 16-port Modem dialing module and use the internal DHCP service to assign addresses to the dial-in users.

Cisco2620 (config) # interface Group-Async1

Cisco2620 (config-if) # ip unnumbered FastEthernet0/0

Cisco2620 (config-if) # encapsulation ppp

Cisco2620 (config-if) # ip tcp header-compression passive: Enable passive IP header compression

Cisco2620 (config-if) # async mode dedicated: works only in asynchronous mode

Cisco2620 (config-if) # peer default ip address dhcp: Forward ip address requests to the DHCP server

Cisco2620 (config-if) # ppp authentication chap: sets authentication as CHAP.

Cisco2620 (config-if) # group-range 33 48: the dial-up group contains 16 ports.

The 16 AM module of Cisco provides a high-density Analog Circuit Access Mode. employees not in the office building can use Modem to dial up the LAN and log on to the server for remote office.

The peer default ip address dhcp command allows the dial-in workstation to dynamically obtain the ip address through the DHCP server in the LAN, saving ip address Resources and receiving parameters configured on the DHCP server, for example, if the IP address of the DNS server is configured with a static route pointing to the firewall in global mode, the workstation can also access the Internet through the firewall.

Cisco2620 (config) # ip route 0.0.0.0 0.0.0.0 192.168.1.4: Set the static route to the firewall

(5) setting the physical characteristics of the 16 AM Module

Cisco2620 (config) # line 33 48: Enter the Modem port Mode

Cisco2620 (config-line) # session-timeout 30: The timeout value is set to 30 minutes.

Cisco2620 (config-line) # autoselect during-login: Automatic Logon

Cisco2620 (config-line) # autoselect ppp: automatically selects the PPP protocol

Cisco2620 (config-line) # login local: Allow local Password check

Cisco2620 (config-line) # modem InOut: Allow dial-in and dial-out

Cisco2620 (config-line) # transport input all: Specify the transmission protocol

Cisco2620 (config-line) # stopbits 1: Set a stop bit

Cisco2620 (config-line) # flowcontrol hardware: sets the hardware traffic control.

(6) Add the user name and password of the dial-up user

Cisco2620 (config) # username shixuegang password abc123: add the username shixuegang and the password is abc123

(7) Enable rip Routing

Cisco2620 (config) # router rip: Enable rip Routing

Cisco2620 (config-rout) # version 2: version 2

Cisco2620 (config-rout) # network xxx. xxx: Specify the network number of the data packet to be forwarded

Cisco2620 router Fault Identification and troubleshooting

1. Identify Ethernet port faults

For the diagnosis of Ethernet port faults, run the show interface fastfastfastethernet 0/0 (for the diagnosis of Ethernet port 0) command to check the status of a link. The possible results are as follows:

If the Ethernet port is working normally, the following displays: Fastethernet 0/0 is up, line protocol is up;

If a connection failure occurs, for example, if the router is not connected to the LAN, Fastethernet 0/0 is up and line protocol is down;

If the interface fails, the following error occurs: Fastethernet 0/0 is down, line protocol is down (disable );

If the interface is artificially disabled, the following error occurs: Fastethernet 0/0 is administratively down, line protocol is down;

In addition, if you suspect that the port has a physical fault, you can use the show version command. This command will display the rational and normal port, but the physical failure port will not be displayed.

2. Identify Synchronous Serial Port faults

We can use the show interface serial 0/0 command to check the status of a link. If Serial 0/0 is up or line protocol is up, the link is working properly. If serial 0/0 is up, line protocol is down, it indicates that the port has no physical faults, but the upper-layer protocol has not reached the IP address, IPX, X25, etc. In this case, check the router configuration command to check whether the address matches ); if Serial 0/0 is down and line protocol is down (disable) is displayed, it indicates that the port has a physical fault. In this case, the port should be changed. If Serial 0/0 is down, line protocol is down, indicating that the DCE device Modem/DTU has not sent the carrier/clock signal; If Serial 0/0 is administratively down, line protocol Is down indicates that the interface is artificially closed. You can remove the shutdown command under interface_mode in the configuration status.

3. Identify analog line faults

You can call the router trunk line number directly by phone. If you hear the call, the line is normal. Otherwise, you should check the telephone line first. If the system still fails to work normally after line troubleshooting, check the configuration commands of the vro on the 16 AM module. After confirming that the configuration commands are correct, you can use the following methods:

• Ground the module properly;
• Upgrade the router IOS version;
• Change the 16 AM module.

Password Recovery and catastrophic recovery of Cisco2620 vro

When using a vro, the password is often forgotten. At the same time, during the operation, the version image file inside the vro may be damaged due to unpredictable reasons, making the vro unable to work properly, resulting in the vro returning to the monitoring status, however, you cannot update the version by using the common Copy command. These two problems are common issues in daily maintenance.

1. Password Recovery

(1) connect the Console port of the router to the serial port of the computer, start the computer Super Terminal, enable the power of the router, and press ctrl + break within 60 seconds to bring the router into the rom monitor status, the following prompt is displayed:

Rommon1>

(2) Reconfigure the configuration register.

Rommon1> confreg

Select y when do you wish to change the configuration (y/n) appears, and y When enable ignore system configuration information (y/n) appears.

(3) restart the vro.

Rommon1> reset

(4) Enter privileged mode after startup, and execute the following command to make the original configuration information valid.

Router (config) # config mem

(5) You can view or change the password.

2. Catastrophic version recovery

Cisco2620 provides two disaster recovery methods: tftpdnld and xmodem.

(1) tftpdnld Mode

Connect the computer serial port to the vroconsole Console port. The computer network port and the vro Ethernet port must be connected to the first Ethernet port.

Start the TFTP server and place the version to be downloaded under the specified directory.

Enable the vro power. Because there is no valid version, the vro will directly enter the monitoring mode after it is started.
Rommon1>

Set parameters as follows.
Rommon2> IP_ADDRESS = 192.168.1.6: configure the address 192.168.1.6 to the first Ethernet port of the router.

Rommon3> IP_SUBNET_MASK = mask 255.255.0: Set the mask.

Rommon4> DEFAULT_GATEWAY = 192.168.1.7: Specifies the address of the TFTP server.

Rommon5> TFTP_FILE = c2600-i-mz.121-3.T: Specifies the IOS file name

Rommon6> tftpdnld: Download the IOS File

Configuration register
Rommon7> confreg

Select y when do you wish to change the configuration y/n appears, select y when change the boot charaterist y/n appears, and select parameter 2. Select n for other options.

Start version
Rommon8> reset

(2) xmodem download

This method does not require ethernet cable. You only need a Super Terminal. The disadvantage is that it takes too much time and the speed is too slow. Xmodem is an asynchronous file transfer protocol widely used in PC communication. It transmits data in the form of 128 bytes and verifies each block. If the receiver verifies the data correctly, the sender sends an authorization message, and the sender sends the next block.

The procedure is as follows:

After connecting to the vro with a Super Terminal, start the vro and the vro enters the monitoring mode.
Rommon1>

Start xmodem command
Rommon2> xmodem-cx? : Press Enter.

When do you wish to continue appears, select y

Open the "transfer" menu of the Super Terminal, select transfer file, and open the transfer file window. Enter the location of the version file and select the xmodem mode.
Modify the corresponding commands and options, or use ymodem for transmission.

Configure the confreg command in the same way as above. After the router is restarted, it enters the normal state.
Two methods to enter the Cisco2620 router ROM status

1. If the break is not blocked, press ctrl + break within 60 seconds after it is started to interrupt the startup process and enter the rom status.

2. Set the baud rate of the Super Terminal to 1200, the data bit to 8, the parity bit to 1, and the stop bit to none. Turn on the vro power and shut down after startup. After stopping the device for five seconds, restart the device and press the Space key for 12 seconds. After the router is started, change the default value of the Super Terminal bit. The communication baud rate is set to 9600, the data bit is 8, the parity bit is 1, and the stop bit is not. After the connection is reconnected, you can see from the terminal that it is in the rom status. Note that NO content is displayed on the terminal when the baud rate is 1200.

In addition to the above functions, Cisco routers can also implement more and more powerful functions without changing the hardware through IOS software upgrades, it protects hardware investment while meeting customers' increasing needs. However, this also increases the difficulty of configuration and management, and also puts forward higher requirements for network administrators. Therefore, how to make network devices work efficiently and reliably and minimize the maintenance workload remains to be further explored in practice.