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Archive for March, 2010
Weekly Open Ended Question #9
Mar 31st
The answer to the eighth question has been added to the post.
Ninth question:
What are the five EIGRP packet types, and what do they do?
Please post answers in the comments (without Googling)!
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Practice Subnetting
Mar 26th
Steve at Networking-Forum has created a tool to practice subnetting. Here’s an example question:
It’s a very cool idea, IMO. Check it out!
Troubleshooting Lab #5
Mar 25th
This one might be easy, but I’m having trouble gauging it after last week. Same topology, users are having trouble communicating from one VLAN to the other. Soon I’ll make a new (bigger) topology with more diverse technologies, I haven’t had the time lately.
You can run the .net on your own Dynamips server or you can use mine. Run the topology and login with username “tshoot” and password “tshoot”. This user only has privilege level 1, so show commands will be available, but show run will not be. You can also login with username: “shrun” and password: “shrun”, this will print the running config and boot you out. I would like to grant full privilege 15 access, but I’m worried about people messing with the configs, this is after all a public post. Obviously you could get around this pretty easily, but that would defeat the purpose. 
Make IOS Like JUNOS
Mar 24th
Thought you guys would like the title. 
Sorry for the lack of content lately, I’ve been very busy.
Today we’re going to explore the “archive” feature in IOS with a small “archive tutorial”. This was sparked by a recent comment on one of my JUNOS posts. The commenter said that the “archive” command in IOS is the same as “rollback” in JUNOS. They are similar, but “rollback” is there by default where you need to do some tinkering with “archive”. I’ve used it in the past, but never with the intention of mimicking JUNOS’s “rollback”.
Here’s the config:
EDGE(config)#archive EDGE(config-archive)#? Archive configuration commands: default Set a command to its defaults exit Exit from archive configuration mode log Logging commands maximum maximum number of backup copies no Negate a command or set its defaults path path for backups rollback Rollback parameters time-period Period of time in minutes to automatically archive the running-config write-memory Enable automatic backup generation during write memory EDGE(config-archive)#path disk0:config-backup EDGE(config-archive)#max 14 EDGE(config-archive)#write-memory |
To enter the config, we simply type “archive” in global config. There are quite a few options, as we can see. First we’ll need to set our path to store the archived configs, this is a 7200, so I’m using disk0 and a simple naming convention. Next we specify how many configs we want to backup, I’m using the maximum on my device, which is 14. Finally we set the “write-memory” command, which tells the router to archive the config anytime we save.
Troubleshooting Lab #4
Mar 18th
Today is probably going to be another easy one, but I threw it together pretty quick. We’re using the same topology as last time. Same issue, users cannot communicate, but different problem.
You can run the .net on your own Dynamips server or you can use mine. Run the topology and login with username “tshoot” and password “tshoot”. This user only has privilege level 1, so show commands will be available, but show run will not be. You can also login with username: “shrun” and password: “shrun”, this will print the running config and boot you out. I would like to grant full privilege 15 access, but I’m worried about people messing with the configs, this is after all a public post. Obviously you could get around this pretty easily, but that would defeat the purpose.
Here’s our topology:
(Click for fullsize)
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