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My journey to CCIE!

Let’s Review: EIGRP Named Mode

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My next stop on my CCIE: R/S Written review. EIGRP, the big change here is EIGRP Named Mode it’s the same EIGRP with a new shiny cover. So , let’s jump in.

To start the new named mode configuration we need to define the ‘named instance’ compared to defining the autonomous system out of the gate.

EIGRP-Name-Config

Now, we are dropped into router configuration mode, with a new set of configuration options

EIGRP-Config

From this configuration mode, we can turn on/off the EIGRP instance, configure the address family instance and service family instance. However, from this top layer I do not see the option to configure the advertised prefixes or alter metric information. So lets dive a bit deeper and look at the address family configuration. (If you have done anything with MP-BGP, you’ll know where this is going:

EIGRP-Address-Family

Looking through the address family configuration options, we start seeing options that we are familiar with. First off we decide if this will be IPv4 or IPv6, then we can decide on the autonomous system, whether this is a unicast or multicast address-family, and the last cool thing VRF specific details!

Once we define the IP version and AS #, we get dropped if in a new configuration mode, where we get into some more of the nuts and bolts:

EIGRP-AF-Config-Mode

Notice from here, we can define what interfaces participate in this EIGRP Address Family, along with some metric information and we can define specific neighbors (POP QUIZ: How does statically defining neighbors affect the behavior of EIGRP?)

Some of these configurations take us deeper down the configuration-mode rabbit hole, for example configuring the af-interface goes down another level. In this next configuration mode we can define interface specific options such as summary routes, BFD, timer intervals, and much more:

EIGRP-AF-Interface

What about route filtering and redistribution, so far we haven’t seen a way to do that yet. This is where the topology base command comes in:

EIGRP-Base

Now, the picture is becoming complete. From this topology configuration mode we can perform some route-filtering, redistribution, and even apply offset-lists to further manipulate routing metrics.

So the configuration is quite different than the old method but at least now it is all contained in one spot in a more hierarchical model.

EIGRP-Whole

Another, fun fact. You can migrate the old EIGRP syntax to the new named mode configuration with the following command: eigrp upgrade-cli

 

Written by Stephen J. Occhiogrosso

May 27, 2015 at 9:30 AM

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