From: Bell, Mark (Houston) (m.bell@xxxxxxxxxx)
Date: Wed Oct 04 2000 - 10:09:02 GMT-3
The layout is as follows:
ASBR----R5----R6
\
\
R3
R5 has an interface in Area 0, as does the ASBR while it's multipoint
interface to R3 and R6, along with R3 and R6 themselves are in Area 10.
The strangest thing happened, though. When I left last night, I left my
terminal session open to the routers. I did not make any further
configuration changes because I was hoping for some responses from my post
last night and figured I would examine it more closely in the morning. When
I came in this morning and looked at the routing table of R3, the external
routes were gone! Nobody touched the routers between the time I left and
when I came in this morning. I attached a copy of the history buffer from
my terminal session.
The most obvious question is if the routes are gone now, why did they every
show up in the first place? If it is a matter of routes being aged out, how
long does it take for this to happen?
-----Original Message-----
From: Price, Jamie [mailto:jprice@isgteam.com]
Sent: Tuesday, October 03, 2000 23:06
To: 'Bell, Mark (Houston)'; CCIE Study Group (E-mail)
Subject: RE: OSPF stub area question
You said that behind the hub router is an ASBR. Forgive me if its too
obvious but is that ASBR in the same area as the hub, or to put it another
way are the hub/spoke routers in a separate area to the ASBR? ASBR's cannot
be internal to stub areas because their very nature is to inject external
routes into an area.
Post the relevant portions of the config for more detail.
Jamie
-----Original Message-----
From: Bell, Mark (Houston) [mailto:m.bell@wilcom.com]
Sent: Tuesday, October 03, 2000 10:33 PM
To: CCIE Study Group (E-mail)
Subject: OSPF stub area question
I have a setup where the WAN interface of a hub router and the two spoke
routers are configured in an OSPF stub area. Behind the hub router, there
is an ASBR redistributing from EIGRP to OSPF. In both of my spoke routers,
I am seeing OSPF external routes showing up in the routing table (designated
"O E1").
It is my understanding that a stub area should not have AS external routes
advertised into it and a totally stubby area should not have anything but a
default route advertised in. If this is the case, why are these AS external
routes showing up?
----------------------------------------------
Kenneth Mark Bell, CCNP, NNCSE
Network Engineer II m.bell@wilcom.com
Williams Communications Solutions
t: (713) 307-7254 p: (713) 912-2276
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