On Tuesday, December 10, 2013 11:41:10 AM Patrick M. Hausen wrote: > Most ISPs I know who run OSPF configure it the way I > described with very narrow „network“ statements and > explicit redistribution. Essentially my subscriber lines > are from the IGP’s point of view not part of my AS and > every router running subscriber lines is an ASBR. The > prefixes are consecutively injected as AS external LSAs.
I find all these knobs relatively complicated for an IGP. But, I can see how enterprise network would need them, although such networks have also started migrating to the service provider way of doing things. > BTW: this is the only way (as far as I know) how you > *can* filter what goes in your link state database and > what doesn’t. Despite the „traditional“ literature > claiming that you cannot do that with OSPF at all. Which > is of course correct but for AS external LSAs ;-) BGP just gives you more control, and as your network grows, BGP scales better than an IGP. Look at the state of the Internet routing table :-). Mark.
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