The first stage of Linux operation and Maintenance course Summary (iv) CISCO

Linux operation and Maintenance course First Stage summary of the difficult points (Iv.) CISCO

One, the router interface operation:

1.#show running-config View interface

2,#interface fastethernet 0/1 into f0/1 configuration (0/1, 0 for slot 1 for port, if s0/ 0/0, the first 0 indicates the router itself)

3,#interface fastethernet 0/1

#description Tachingroute Interface Description

4.#do show Running-config do allows commands to run in other modes

5,#int f0/0

#no shutdown Activation interface, interface is off by default

6,#int f0/0

#ip Add 192.168.1.10 255.255.255.0 to port with IP

#do SH int f0/0

7,#show controllers s1/0 Confirm that this end is the DCE end

#int s1/0

#clock Rate 64000

#do SH contro s1/0

#bandwidth 1000

clock frequency, in the generation environment without configuration, generally by the server operator control, clock frequency only for the serial port connected to the router, serial port for the old-fashioned WAN connection, mainly for The E1 Network (bandwidth 2.048Mbps) has now been replaced by fiber optics. If you use a serial port to connect two routers, only the DCE -side configuration (data communication devices),DTE does not need to be configured (data terminal equipment).

8,#copy running-config startup-config Save Configuration

#erase startup-config Delete a configuration

#reload

Second, check the router authentication configuration

1,#ping IP address detection IP is unblocked

2.traceroute domain name or IP test Routing path

3.telnet IP or domain port remote management or probe port

4,#clear counters f0/0 Clear the counter of the interface

5,#show IP interface View interface IP information

6,#show IP interface Brief view IP information and status of all interfaces

7. #show Protocols View the protocols on all interfaces

Third, Advanced IOS Operations

1. Router Boot sequence

(1) The router performs post -post, checks the hardware to verify all components of the device,post is stored in ROM , and runs from it;

      ( 2 Find and load ios ios in the order of Flash -tftp ios

      ( 3 take over the boot process and in nvram Startup-config

(4) If startup-config is found in NVRAM,copy to RAM , Generate running-config, load Login interface, If the startup-config is not found, the broadcast is sent to all interfaces, the TFTP isused to configure the router, and if TFTP is not found , the User Interaction Settings Dialog mode is initiated to initialize the configuration.

Note: NVRAM nonvolatile random memory, which can save data after a power outage, is used to save permanently active configuration files.

2. Crack password

(1)console line connected to the router, power on a second after pressing Ctrl+break, interrupt the START process, into the rom-moritor mode, At this point the prompt is Rommon 1>

(2) Change the value of the register,>config 0x2142

(3) restart,>reset

(4)#copy startup-config running-config

#enable Secret Lamp

(5)#config-register 0x2102

#copy Run Start

iv. Cisco Discovery Protocol CDP(CISCO Discovery Protocol)

1.#show CDP

#show CDP Interface

#cdp Timer 60

#cdp holdtime. Get timer and save time information

#cdp Run to activate CDP

2.#show CDP neighbors collect neighbor information

#showcdp entry *

#showcdp Entry * Protocol

#showcdp Entry * Version

V. Router backup, upgrade, and recovery

1,#copy tftp:flash:

#copy flash:tftp:

• The main memory of the router is:

ROM: one point IOS attached;

RAM:ios divides random access memory into shared and main memory, which is used primarily to store the running routing configuration and the IOS data structures associated with the router protocol ;

Flash: Storage iOS software image, Flash is erasable memory, can be overwrite with new version of iOS;

NVRAM: The configuration file for the storage system.

from Brother Lian training

The first stage of Linux operation and Maintenance course Summary (iv) CISCO