Hi there,
I have a little OSPF issue.
Topology:
A0-----R3--A11---R4--A13---R5
(Where Ax is OSPF Area X and Rx are Routers)
There is a virtual link over area 11.
R4 and R5 have Lo0 interfaces that we can advertise wherever we want.
Requirements:
*We need to see both R4 and R5 loopbacks on R3.
*On R3, we also need to see a summary route representing the link
between R4 and R5, and their loopbacks (let's say they all start with
octet 45 and we need to see route 45.0.0.0/8)
* R5 must see only a default route (on the top of the connected of course):
O* IA 0.0.0.0/0 [110/11] via 45.45.45.4, 00:21:06, Ethernet0/1
*In Areea 13, only Intra area routes and default routes are allowed.
Solution:
We need area 13 totally stubby. ok.
My problem is to have both specific routes together with the summary
seen on R3. If we use "are 13 range 45.0.0.0 etc" on R4, and advertise
the loopbacks in area 13, we see only the summary route on R3, as it
suppresses the more specific loopbacks.
To solve this, I can advertise Lo in a fancy area (67 let's say). If I
do that, it works for R4 loopback but R5 loopback is seen nowhere
(expected as we are totally stub).
I could remove the area command and use summary instead. Then create an
additional loopback with a fancy 45.x.0.0.0 address to force summary to
advertise a 45.0.0.0 route but it looks dirty.
Or, I can keep the range command, make are 13 nssa no-summ and red conn
on R4/R5, then I see the 2 loopback routes on R3 and the summary. Good,
excpet that I am afraid to brake the requirement "In Area 13, only Intra
area routes and default routes are allowed" (that was the exact wording
used). Does this wording allow a nssa? I don't think so.
Thanks for the help
Michael
