Stub area is an area that does not accept information about routes external to the autonomous system.
Does the “external routes” must be from non-OSPF (RIP, IGRP, EIGRP) always with different AS, or it can be from another OSPF but with different AS ?
{ 4 comments… read them below or add one }
OSPF routes redistributed from one process to another will also be seen as external routes and will therefore not be flooded to stubby areas.
Why cisco book says about external route as :”non-ospf”——-> that means cisco book specifys external route with non-ospf only!!!
And as you mentioned that external route can be form another ospf process
Any route redistributed into OSPF will be seen as an external route no matter if it is from OSPF or any other source. Redistribution of OSPF routes from one process to another is kind of a corner case and this is probably why is was omitted in the book.
One more think you said : “from OSPF or any other source”.
I want you to comment this also please :
http://www.riverstonenet.com/support/ospf/ospf-areas.htm
“A router that redistributes prefixes from other sources into OSPF is an ASBR. Routes from non-OSPF sources are referred to as External routes—etc”.
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