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EIGRP - hierarchical?
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| Bolero 2002-04-04, 1:33 pm |
| It doesn't use areas like OSPF, ISIS/NLSP. As such, my impression is that the AS is flat. At most the only form of hierarchy in EIGRP, if it's considered so, is using VLSM and the auto-summary to aggregate contiguous subnets in routing advertisements.
My understanding of a hierarchical routing protocols is that they use areas which can have different routing information policies like stub areas in OSPF.
But in the DCN book, it always refers to EIGRP as a "hierarchical" routing protocol.
Can anyone tell me why?
Thanks much!! | |
| chodan 2002-04-05, 3:49 pm |
| Although it doesn`t use area`s I think what it is saying is that EIGRP supports hierarchical network designs.
Using Autonomous Systems, Core distribution and access tiered design, and address summerization you will have a hierachical network.
Area`s facilitate hierarchical design in other protocols but they aren`t the only aspect that dictates a hierarchical design.
Anyone feel free to correct me if I am wrong | |
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| Bolero 2002-04-06, 10:27 pm |
| Thanks for the link! I have a question for all routing experts though:
From
quote:
http://www.cisco.com/univercd/cc/td...03.htm#xtocid11
"Enhanced IGRP uses a nonhierarchical (or flat) topology by default."
How do I make EIGRP use a non-default hierarchical topology? | |
| chodan 2002-04-06, 10:39 pm |
| the no auto-summary command
I think that will allow you to summerize you network addressing in a hierarchical manor. |
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