Recent posts

EIGRP Network Command Tips

August 08, 2011 | 2 minute read

I discussed the EIGRP “network” command in the EIGEP Network Command – The Easy Way Out post, as well as the EIGRP Route Advertising post, and I’m about to discuss it again in this post. Who knew one command would be the source of so many posts! :) If given incomplete information, the EIGRP “network” command will do its best to help you complet...

EIGRP Network Command - The Easy Way Out

August 08, 2011 | 1 minute read

In my EIGRP Route Advertising post I said “in order for two routers to exchange EIGRP routes, they must both be part of the same subnet and have a network command specifying that particular subnet, or, at the very least, their specific IP address on that subnet”. In that entry I then went on to use the routers’ specific IP addresses. In this ent...

The “do” Command

August 08, 2011 | 1 minute read

Don’t you just hate it when your in the middle of implementing a new configuration but then decide you’d like to issue a “show” or “ping” command so you drop down to privileged EXEC mode? For example: R2(config)#router eigrp 10 R2(config-router)# network 192.168.20.2 0.0.0.0 R2(config-router)#exit R2(config)#exit R2# R2#ping 192.168.20.1 Type e...

Dangers of the EIGRP “Neighbor” Command

August 06, 2011 | 5 minute read

I have touched on EIGRP a few times before and here we are again. In my EIGRP Route Advertising post I explained how EIGRP neighbor relationships can be created using the “network” command. In this post I will explain how they can be formed using the “neighbor” command and the dangers of using it as well. To do this, I’ll be using the followin...

EIGRP No Auto Summary Command, Part 1

May 28, 2010 | 6 minute read

In my previous post about EIGRP Route Advertisements I touched on the “no auto-summary” command, but did not delve in to the details of what this command actually does, so today I will. In a nutshell (see Part 2 for a more detailed explanation), when using EIGRP the “auto-summary” command (which is enabled by default), what happens is that the ...