From: Toh Soon, Lim (tohsoon28@gmail.com)
Date: Sat Aug 11 2007 - 12:26:09 ART
Hi Jim.
I have labbed your scenario. My router R2 is an ABR between Area 0 and 12.
It learns the following OSPF routes in Area 12:
Connected : 172.29.12.0/26
Intra-area : 192.168.1.1/32
External-1 : 172.29.10.0/26
I configured the following "area range" commands on R2:
!
router ospf 1
area 12 range 172.29.10.0 255.255.255.0
area 12 range 172.29.12.0 255.255.255.0
area 12 range 192.168.1.0 255.255.255.0
!
The following is output of "sh ip ospf":
Area 12
Area ranges are
172.29.10.0/24 Passive Advertise
172.29.12.0/24 Active(1) Advertise
192.168.1.0/24 Active(2) Advertise
My understanding is the "area range" command is used only with ABRs to
summarize intra-area routes for an area. Can you confirm your component
routes are not OSPF external routes?
Anyone, any comments?
Thank you.
B.Rgds,
Lim TS
On 8/10/07, James MacDonald <j4m3sm63@yahoo.ca> wrote:
>
> thanks ... i saw the default setting as active before ... but even with
> that
> the routes are passive. Is there a condition for the route to be active?
> For
> instance does one of the subnets for the summary need to be physically on
> the
> router for the summary to be created?
>
>
>
> ------------------------------
> Jim
> MacDonald
> j4m3sm63@yahoo.ca
> ------------------------------
>
> ----- Original
> Message ----
> From: tom sun <tomsun2007@gmail.com>
> To: James MacDonald
> <j4m3sm63@yahoo.ca>
> Cc: ccielab@groupstudy.com
> Sent: Thursday, August 9, 2007
> 11:47:12 PM
> Subject: Re: OSPF Summarization question
>
> hi
> Router(config-router)#area 1 range 10.1.0.0 255.255.0.0 ?
> advertise Advertise this range (default) --------active
> -----suppress
> detail routes that this summarize route
> include,and advertise summarize route
> .
> not-advertise DoNotAdvertise this range
> ---------passive----suppress detal routes that this summarize route
> include
> ,and don't advertise summarize route
>
>
> On 8/9/07, James MacDonald
> <j4m3sm63@yahoo.ca> wrote:
> >
> > Anyone know when you summarize on an ABR using
> the area range commands why
> > some summary routes will show up in the "sh ip
> ospf" output as "Passive
> > Advertise" instead of "Active Advertise"? Also,
> what is the overall impact
> > of
> > the passive advertise? In my scenario i'm
> noticing that routers in one
> > area
> > are seeing all the routes and not the
> summaries from another area ... i
> > think
> > it's as a result of the passive
> status.
> >
> > Is there a way to force them active?
> > what is the criteria for
> them to be active?
> >
> > Searched google and most of my
> > books to no avail.
> >
> >
> Thanks
> >
> > ------------------------------
> > Jim MacDonald
> > j4m3sm63@yahoo.ca
> > ------------------------------
> >
> >
> >
> >
> > Be smarter than
> > spam. See
> how smart SpamGuard is at giving junk email the boot with the
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> Mail at http://mrd.mail.yahoo.com/try_beta?.intl=ca
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> >
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