Archived; click post to view.
Excerpt: Link state routing protocols maintain topology tables to determine the best candidate to place in the routing table. EIGRP is no different – it uses this topology table to build a vision of the network from the perspective of each participating router. This topology table is reviewed by the routing algorithm (in the case of EIGRP, it is DUAL) and decisions are made regarding what gets placed into the routing table. Since EIGRP uses bandwidth and delay as metrics in this decision making process, they are used to decide which link out of several redundant connections to use to get…
EIGRP Feasible Successors
July 31, 2011 by 3 Comments
The Anatomy of “Show IP Route”
July 18, 2011 by 9 Comments
Archived; click post to view.
Excerpt: One of the most important skills to have when it comes to basic networking is the ability to look at a routing table and determine exactly where a packet will be routed when it comes to a router. Sometimes a routing table is relatively simple, and this process is easy. However, many times this is not the case. In large networks, especially networks that implement a hub and spoke design where core routers are often required to know hundreds of routes or more, this can be tedious. I’d like to discuss the routing table on a Cisco router, and identify…
