[nsp] Not using "redist sta sub" in OSPF

[Matt Ryan]

>In general, redistribution is bad. In OSPF, by default, a redistributed
route will be 
>injected into OSPF as a type II external route.  This means it will flow to
all areas, 
>regardless of route summarization on the ABR's, and could destroy the
scalability of the 
>network design. (Not really an issue in a small simple net, unless you end
up growing 
>beyond your plans.)

I don't believe this is the case - the stability of an link state protocol
link OSPF is governed by the number of branches in the SPF tree that the
routers have to recalculate when a topology change occurs - externals are
leaves and therefore do not have a impact on CPU (but do, of course, take up
additional memory). If a significant number of customer specific routes are
redistributed into the IGP it's easy to make them contiguous and then just
redistribute the supernet.


Matt.

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