From: Jason Brown (jasbrown@gmail.com)
Date: Tue May 23 2006 - 23:41:16 ART
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/iprrp
_r/ip2_a1g.htm#wp1037480
Usage Guidelines
With this feature enabled in the "in" direction, all type 3 LSAs originated
by the ABR *to this area*, *based on information from all other areas*, are
filtered by the prefix list. Type 3 LSAs that were originated as a result of
the area range command in another area are treated like any other type 3 LSA
that was originated individually. Any prefix that does not match an entry in
the prefix list is implicitly denied.
With this feature enabled in the "out" direction, all type 3 LSAs advertised
by the ABR, based on information *from this area to all other areas*, are
filtered by the prefix list. If the area range command has been configured
for this area, type 3 LSAs that correspond to the area range are sent to all
other areas, only if at least one prefix in the area range matches an entry
in the prefix list.
If all specific prefixes are denied by the prefix list, type 3 LSAs that
correspond to the area range command will not be sent to any other area.
Prefixes that are not permitted by the prefix list are implicitly denied.
Examples
The following example filters prefixes that are sent from all other areas to
area 1:
area 1 filter-list prefix AREA_1 in
HTH
On 5/23/06, CCIEin2006 <ciscocciein2006@gmail.com> wrote:
>
> Any ideas guys?
>
> On 5/22/06, CCIEin2006 <ciscocciein2006@gmail.com> wrote:
> >
> > Folks,
> >
> > Given the following example:
> >
> > Area0---(R1)---Area1---(R2)
> >
> > If I were to filter routes coming from Area0 to Area1 logic would
> dictate
> > using an outbound area filter-list on R1 for Area1.
> > However when I tried this on my gear it did not work.
> >
> > But when I applied the filter-list inbound on R1 for Area1 it worked.
> >
> > Is the logic here to filter routes from going INBOUND to the OSPF
> > database?
> >
> > Please let me know the proper usage for this command because I find the
> > Cisco documentation examples are not clear.
> >
> > Thanks.
>
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