Acrobatic Swan Lake

Posted on August 6th, 2008 in China, News by

Dancers of the Guangdong Acrobatic Troupe perform during a press preview of the Chinese Acrobatic Swan Lake at the Royal Opera House in central London August 5, 2008. The ballet runs at the Royal Opera House until August 10. [CFP]

A performer of the Guangdong Acrobatic Troupe performs during a press preview of the Chinese Acrobatic Swan Lake at the Royal Opera House in central London August 5, 2008. The ballet runs at the Royal Opera House until August 10. [Agencies]

Cisco Command Summary

Posted on August 6th, 2008 in Cisco by

Cisco Command Summary

  • Cisco Router Configuration Commands - Lists how to enable and disable interfaces, add IP addresses to interfaces, enable RIP or IGRP and set passwords.
  • Cisco Router Show Commands - Handy show commands to check on the status of interfaces.
  • Cisco Router Basic Operations - Covers getting into and out of different modes. Also, some handy shortcut keys are included.
  • Cisco Router Copy Commands - How to save and backup your router configuration and IOS file.
  • Cisco Router Debug Commands - Some useful debug commands.

Cisco Router Configuration Commands

Requirement Cisco Command
Set a console password to cisco Router(config)#line con 0
Router(config-line)#login
Router(config-line)#password cisco
Set a telnet password Router(config)#line vty 0 4
Router(config-line)#login
Router(config-line)#password cisco
Stop console timing out Router(config)#line con 0
Router(config-line)#exec-timeout 0 0
Set the enable password to cisco Router(config)#enable password cisco
Set the enable secret password to peter.This password overrides the enable password and is encypted within the config file Router(config)#enable secret peter
Enable an interface Router(config-if)#no shutdown
To disable an interface Router(config-if)#shutdown
Set the clock rate for a router with a DCE cable to 64K Router(config-if)clock rate 64000
Set a logical bandwidth assignment of 64K to the serial interface Router(config-if)bandwidth 64
Note that the zeroes are not missing
To add an IP address to a interface Router(config-if)#ip addr 10.1.1.1 255.255.255.0
To enable RIP on all 172.16.x.y interfaces Router(config)#router rip
Router(config-router)#network 172.16.0.0
Disable RIP Router(config)#no router rip
To enable IRGP with a AS of 200, to all interfaces Router(config)#router igrp 200
Router(config-router)#network 172.16.0.0
Disable IGRP Router(config)#no router igrp 200
Static route the remote network is 172.16.1.0, with a mask of 255.255.255.0, the next hop is 172.16.2.1, at a cost of 5 hops Router(config)#ip route 172.16.1.0 255.255.255.0 172.16.2.1 5
Disable CDP for the whole router Router(config)#no cdp run
Enable CDP for he whole router Router(config)#cdp run
Disable CDP on an interface Router(config-if)#no cdp enable

Cisco Router Show Commands

Requirement Cisco Command
View version information show version
View current configuration (DRAM) show running-config
View startup configuration (NVRAM) show startup-config
Show IOS file and flash space show flash
Shows all logs that the router has in its memory show log
View the interface status of interface e0 show interface e0
Overview all interfaces on the router show ip interfaces brief
View type of serial cable on s0 show controllers 0 (note the space between the ’s’ and the ‘0′)
Display a summary of connected cdp devices show cdp neighbor
Display detailed information on all devices show cdp entry *
Display current routing protocols show ip protocols
Display IP routing table show ip route
Display access lists, this includes the number of displayed matches show access-lists
Check the router can see the ISDN switch show isdn status
Check a Frame Relay PVC connections show frame-relay pvc
show lmi traffic stats show frame-relay lmi
Display the frame inverse ARP table show frame-relay map

Cisco Router Basic Operations

Requirement Cisco Command
Enable Enter privileged mode
Return to user mode from privileged disable
Exit Router Logout or exit or quit
Recall last command up arrow or <Ctrl-P>
Recall next command down arrow or <Ctrl-N>
Suspend or abort <Shift> and  <Ctrl> and 6 then x
Refresh screen output <Ctrl-R>
Compleat Command TAB

Cisco Router Copy Commands

Requirement Cisco Command
Save the current configuration from DRAM to NVRAM copy running-config startup-config
Merge NVRAM configuration to DRAM copy startup-config running-config
Copy DRAM configuration to a TFTP server copy runing-config tftp
Merge TFTP configuration with current router configuration held in DRAM copy tftp runing-config
Backup the IOS onto a TFTP server copy flash tftp
Upgrade the router IOS from a TFTP server copy tftp flash

Cisco Router Debug Commands

Requirement Cisco Command
Enable debug for RIP debug ip rip
Enable summary IGRP debug information debug ip igrp events
Enable detailed IGRP debug information debug ip igrp transactions
Debug IPX RIP debug ipx routing activity
Debug IPX SAP debug IPX SAP
Enable debug for CHAP or PAP debug ppp authentication
Switch all debugging off no debug allundebug all

Dynamic Failover with IP SLA

Posted on August 6th, 2008 in Cisco by

This post describes how to set up IP SLA to allow a static route to failover if pings to a specified internet host should fail. This is really useful if you have two ISPs (and thus, two default routes) where the router cannot detect a link failure. This is really common if you have a cable/DSL modem or some type of wireless connectivity. Here’s the basic config, taken directly from Shawn’s Blog:

ip sla 1 < The number 1 here is arbitrary, used only to identify this sla. It is otherwise knows as the operation number>

icmp-echo 4.2.2.2 < 4.2.2.2 is a DNS server that responds to pings out on the internet>

timeout 500 < This is how long to wait for a response from the ping>

frequency 3 < This is the repeat rate for the SLA>

ip sla schedule 1 start-time now life forever < This command says “start SLA 1 now and keep it running forever>

GNS3 Dream Fulfilled

Posted on August 6th, 2008 in CCNA, Cisco, PASS4SIDE by

Lo and behold - my GNS3 Lab Dream has been mostly fulfilled! As I was blogging on Network World, one of the readers posted this link:

www.pass4side.com

It’s a massive GNS3 support/lab forum where many people have created lab topologies for existing books/scenarios out on the market! Much less work than creating labs manually (my initial idea). I’ve redirected GNS3Labs.com to this site - great stuff!

Okay…I have to admit…I’m a little bummed this is already out there. It feels a little like I jumped out of my chair saying, “wouldn’t it be great if there was a device that could excite water molecules to cause friction and heat up food?!?!” Ehhh… I’m sure I’ll get over it - I’m really excited to see this site in play!

UPDATE: In surfing through the site, they even have a .NET file for the CCIE topology I created for CBTNuggets! Awesome!

CCNA Study Guide Chapter 14

Posted on August 6th, 2008 in CCNA, Cisco by

Implement and verify WAN links.

l  Describe different methods for connecting to a WAN

l  Configure and verify a basic WAN serial connection

l  Configure and verify Frame Relay on Cisco routers

l  Troubleshoot WAN implementation issues

l  Describe VPN technology (including: importance, benefits, role, impact, components)

l  Configure and verify a PPP connection between Cisco routers

 

Describe how a network works.

l  Differentiate between LAN/WAN operation and features

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