As I understand it:
For any given area, all routers with interfaces in that area will have
identical link state databases; therefore, their routing tables would
contain entries for routes within the area.
Intra-area updates are type 1 and 2 LSAs. Inter-area updates are type
3 and 4. Updates from external AS are LSA type 5. A stubby area will
not accept type 5 LSAs (from ASBRs) but will accept all others; in place
of the type 5 LSAs the ABR will advertise a default route pointing to
the ASBR.
A totally stubby area will not accept types 3, 4, or 5. It will accept
types 1 and 2, so it will have full knowledge of intra-area routes, but
it will have a default for all routes outside of its area.
I hope that makes sense, my explainer isn't working very well at the
moment.
John
>>> "Coleman, Jason" 4/18/01 11:47:43 AM >>>
Consider the following scenario:
Two HQ routers that have 2 sites each connected to them over frame
relay
point-to-point sub-interfaces.
The two HQ routers are on the same LAN. These Ethernet ports are in
Area 0.
The HQ1 WAN links and their sites are in Area 1, and the HQ2 WAN links
and
their sites are in Area 2.
Both Area 1 and Area 2 are setup to be totally stubby areas.
When looking at the routing table for a remote site connected to HQ1,
will
you see only a default route or will you see a default route and the
routes
for the other remote site in Area 1?
I have been taken course and been led to believe that there should only
be a
default route, but I read a white paper the other day, and it indicated
that
you will see all Intra-area routes. To me, that means that I should
see
routes to the other networks within my own area.
I am working on setting this up as well to see it work for myself, but
interested in any input.
Thanks,
Jason Coleman - CCNP, CCDP
Customer Engineer
Network Management Center - Austin
(ph) 512-340-3134
(email) [EMAIL PROTECTED]
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