From: Howard C. Berkowitz (hcb@gettcomm.com)
Date: Wed Sep 24 2003 - 21:26:10 GMT-3
At 4:29 PM -0700 9/24/03, Peng Zheng wrote:
>It's said the default behavior is not redistribute any
>routes. But I tried without match, it does
>redistribute internal (intra-area and inter-area)
>routes?
>
>Which one should be the default behavior?
>
Think of it more generally than these two protocols. There's danger
in re-exporting any routes learned externally, because there is
always a risk that you will export them to the routing domain that
created them. That domain, however, will see them as originated by
your domain, so what effectively is a split horizon rule gets
bypassed.
This sort of loop prevention is also why intra-area routes are always
preferred over inter-area routes in OSPF/ISIS.
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