Adding Host Computers to Your GNS3 Labs

Having host PC workstations and servers available in your lab is very beneficial, it allows the user to check connectivity using commands such as ping and traceroute. It also allows the user to view the ARP tables for looking up connected MAC address.  Continue reading “Adding Host Computers to Your GNS3 Labs” »

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CCNP Trouble Tickets GNS3 Labs

So far most of the labs provided on this site have been geared to preparing you for the CCNP routing and switching exams. These exams certify you have a complete understanding of routing and switching technologies, although to be certified as a CCNP you still need to pass the Troubleshooting and Maintaining Cisco IP Networks exam. The exam will certify that the candidate has the knowledge and skills necessary to (1) plan and perform regular maintenance on complex enterprise routed and switched networks and (2) use technology-based practices and a systematic approach to perform network troubleshooting. Continue reading “CCNP Trouble Tickets GNS3 Labs” »

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Free CCNP GNS3 Lab BGP Route Reflector

One important point to remember about iBGP relationships is that iBGP assumes that all of the routers within a single AS are fully meshed. That is, each router is peered to every other router within the same AS. The purpose of this is namely to fix any issues around loop prevention. You’ll recall the BGP uses the AS-Path attribute to prevent against loops. A BGP speaker will drop any update it receives that has its own AS listed in the AS-Path attribute. Since iBGP updates are sent within a single AS, the AS-path attribute isn’t updated and if iBGP speakers continued to forward updates, we would have routing loops. Bottom line is that iBGP speakers will not forward iBGP learned routes to other iBGP peers. Continue reading “Free CCNP GNS3 Lab BGP Route Reflector” »

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Free CCNP GNS3 Lab BGP AS-Path Prepend

The BGP Best Path Algorithm determines how the best path to an autonomous system is selected. The most common value that is used to determine the best path is the AS Path length. When two or more routes exist to reach a particular prefix the default in BGP is to prefer the route with the shortest AS Path length.

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