CiscoZine. Understand the levels of privilege in the Cisco IOS. Many network administrators who work with the Cisco IOS never bother to think about the level of privilege they're using or what that level means. However, the Cisco IOS actually offers 16 different privilege levels. David Davis discusses these different levels and introduces you to the main commands you'll need to configure these privileges.
Want to learn more about router and switch management? Automatically sign up for our free Cisco Routers and Switches newsletter, delivered each Friday! Did you know that the Cisco IOS offers 16 privilege levels for access to different commands? Many network administrators who work with the Cisco IOS never bother to think about the level of privilege they're using or what that level means. When it comes to the different privilege levels in the Cisco IOS, the higher your privilege level, the more router access you have. User EXEC mode—privilege level 1 Privileged EXEC mode—privilege level 15 Show privilege: This command displays the current privilege.
Over 30 Must-Have Open Source Resources. By Sam Dean - Feb. 09, 2009Comments (8) Periodically, we here at OStatic like to round up our ongoing collections of open source resources, tutorials, reviews and project walkthroughs. These educational tools are a central part of the goal here at the site. We regularly round up the best Firefox extensions, free online books on open source topics, free tools for web developers, resources for online video and audio, Linux tutorials, and much more.
In this post, you'll find more than 30 collections and resources. The iMacros Firefox extension is incredibly powerful--an application unto itself, disguised as a Firefox extension. OStatic's Firefox Superguide has been one of our most popular posts. Keir Thomas, a noted Linux author, has made available a free book online: Ubuntu Pocket Guide and Reference.
It used to be that open source video tools were scarce and often fraught with problems--but no more. Some people love Linux but just can't use it full time. Are you upgrading a Linux box? Use 'configure replace' Instead of 'copy start run' Newbie Cisco networking admins are typically taught the command copy running-config startup-config, or copy run start, to save their configurations to NVRAM (i.e. Flash memory). (This is in contrast to the older yet much much more convenient write memory command, or simply wr.) Students quickly realize that the corollary of copying the running configuration to the startup configuration is that the startup configuration can likewise be copied to the running configuration. However, this operation doesn't work quite like one might expect. copy run start generates a new configuration file and overwrites entirely the previous configuration file. copy start run, however, acts more like a copy & paste operation: the contents of the startup configuration are processed as though they were issued via the CLI.
As an example, consider the following configuration excerpt from a startup configuration: interface FastEthernet0/0 no ip address shutdown duplex auto speed auto ! Firewall Overview. Cisco Router-on-a-stick with Switch | Networks Training. In this post I will explain how to provide routing between two VLANs on a simple Layer 2 switch using a Cisco router with just one interface. This is called also Router-on-a-stick. This configuration is usually asked as a question in CCNA exams, so I hope it will be helpful for people preparing for certification. Lets see the diagram below to get us started: A Cisco Layer 2 switch carries two VLANs (VLAN 10 – RED and VLAN 20 – GREEN) with two hosts connected on them as shown on the diagram above. The first host belongs to Network 10.10.10.0/24 (VLAN10) and the second one to 20.20.20.0/24 (VLAN20). By default, if the switch is just a normal Layer 2 switch the two hosts can not communicate between them because they belong to different VLANs and there is no routing.
The router uses just a single interface connected to a trunk port on the switch. SWITCH CONFIGURATION # conf t (config)# vlan 10 (config-vlan)# exit (config)# vlan 20 (config-vlan)# exit. Back Issues - The Internet Protocol Journal. CCNP Practical Studies: Switching | Scenario 3-3: VTP Pruning. On Switch-A, notice that user VLANs 2-4 are active, which means that the active list of VLANs on Switch-A for the trunk is VLANs 2-5 and VLAN 10.
The VTP Join message sent from Switch-A to Switch-B (Step 1) includes this list of active VLANs. When Switch-B receives the VTP Join (Step 2), it does not prune any VLANs from the trunk, because all VLANs allowed on the trunk are listed in the VTP Join message. On Switch-B, notice that user VLANs 2 and 3 are active, while no users are attached to VLAN 4, which means that the active list of VLANs on Switch-B for the trunk is VLANs 2, 3, 5, and 10. The VTP Join message sent from Switch-B to Switch-A (Step 3), therefore, excludes VLAN 4 from the active list and Switch-A consequently prunes VLAN 4 from the trunk (Step 4). To use VTP pruning, the feature must be enabled on all VTP servers and clients in the network (by default, VTP pruning is disabled).
Configuration Tasks To configure VTP pruning, the following configuration tasks are required: 15 more useful Cisco sites. Connecting to Cisco VPN From Ubuntu Linux 12.04 LTS i386/amd64 - connecting-to-cisco-vpn-from-ubuntu-linux-12-04.pdf. CISCO CCIE R&S, Security, Service Provider, Voice Real Lab Workbook Bootcamp.