From: Sam Munzani (sam@xxxxxxxxxxx)
Date: Mon Sep 11 2000 - 10:34:16 GMT-3
So far I understand OSPF in a single autonomous system should have topology
map of whole AS. Filtering at ABR will not help. You can only do filtering
at ASBR while importing external routes.
Sam
> Earl,
>
> As you can see that was also my undersatnding, but I tried to filter out
> routes in a ABR on friday and it doesn't work, I can't understand why IOS
> doesn't allow it.
>
> As a reminder in the cco link below:
>
> http://www.cisco.com/warp/public/104/9.html#Q9
>
> "The command distribute-list out works only on the routes being
redistributed
> by the autonomous system boundary routers (ASBRs) into OSPF. It can be
> applied to external type 2 and external type 1 routes, but not to
> intra-area and inter-area routes."
>
> Earl Aboytes wrote:
> >
> > My understanding is that all routers in a single area must have the same
> > database. It makes sense that you cannot filter within an area but you
> > should be able to filter at the ABR to prevent a route from existing in
an
> > area.
> >
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > Earl Aboytes CCIE #6097
> > Senior Technical Consultant
> > GTE Managed Solutions
> > 805-381-8817
> > earl.aboytes@verizon.com
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> > Kenneth Kriel
> > Sent: Sunday, September 10, 2000 5:59 AM
> > To: 'Ccielab; Alejandro Cadarso
> > Subject: RE: OSPF Filtering
> >
> > Hi all,
> >
> > Thank you for your replies, I am sorry I could not attend to it earlier
> > cause I was out of the country.
> >
> > As many have said, distribute lists do not work if it is in the same
OSPF
> > AS. This I found out the hard way, by trying distribute lists incoming
and
> > outgoing on both routers. The route still appears in my OSPF area 0.
> >
> > I would like to assume the following, however, I need confirmation:
> >
> > Distrubute lists do not work within OSPF, due to the link state issue !
> >
> > If you believe differently, and you can prove it please send me your
config.
> > Mine is as follows : (on R2 as per the diagram at the botom !
> >
> > Thank you for your assistance !!!
> >
> > Ken
> >
> > !
> > interface Loopback0
> > ip address 132.1.1.1 255.255.255.255
> >
> > interface Serial0
> > ip address 135.1.2.1 255.255.255.224
> > encapsulation frame-relay
> > ip ospf network point-to-multipoint
> > no ip mroute-cache
> > bandwidth 64
> > no fair-queue
> > clockrate 64000
> > frame-relay map ip 132.1.2.3 104 broadcast
> > frame-relay map ip 132.1.2.4 104 broadcast
> >
> > router ospf 1
> > network 135.1.1.1 0.0.0.0 area 1
> > network 135.1.2.1 0.0.0.0 area 0
> > distribute-list 17 in Serial0
> >
> > access-list 17 deny 192.2.2.0 0.0.0.255
> > access-list 17 permit any
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> > Alejandro Cadarso
> > Sent: Friday, September 08, 2000 6:30 PM
> > To: mark salmon; ccielab
> > Subject: Re: OSPF Filtering
> >
> > For me the distibute-list in works Ok
> >
> > 2503-mad#sh ip ospf dat
> >
> > OSPF Router with ID (190.19.15.225) (Process ID 200)
> >
> > Router Link States (Area 0)
> >
> > Link ID ADV Router Age Seq# Checksum Link
count
> > 190.19.15.193 190.19.15.193 804 0x80000006 0x960E 3
> > 190.19.15.225 190.19.15.225 838 0x800000F5 0x9BE6 2
> > 210.10.10.9 210.10.10.9 7 (DNA) 0x800000EB 0x1FAA 1
> >
> > Summary Net Link States (Area 0)
> >
> > Link ID ADV Router Age Seq# Checksum
> > 190.1.0.0 210.10.10.9 246 (DNA) 0x80000094 0x95D
> > 190.19.15.224 190.19.15.225 766 0x80000095 0xB27
> > 192.19.18.0 210.10.10.9 246 (DNA) 0x80000093 0x47FA
> > 210.10.10.8 190.19.15.193 804 0x80000002 0xACF6
> > 210.10.10.8 210.10.10.9 11 (DNA) 0x8000009D 0x803A
> >
> > 2503-mad#sh ip ro 190.1.0.0
> > % Network not in table
> >
> > Perhaps some misconfigured command or IOS bug.
> >
> > mark salmon wrote:
> > >
> > > II have used the dstributed in with OSPF in the past. At first, the
> > > route was gone from the routing table. After about 1 minute, the
route
> > > was back.
> > >
> > > Geatti wrote:
> > > >
> > > > Remember, OSPF sends LSAs not ROUTES so a distribute-list out on an
> > > > interface is useless.
> > > > You can use a distribute-list in and this should work for blocking
the
> > route
> > > > from the local router.
> > > > If this doesn't work for you post your config.
> > > >
> > > > -----Original Message-----
> > > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf
Of
> > > > Kenneth Kriel
> > > > Sent: Friday, September 08, 2000 9:42 AM
> > > > To: 'Ccielab
> > > > Subject: OSPF Filtering
> > > >
> > > > Gentleman,
> > > >
> > > > How do I filter a route from coming into OSFP ? I know it might be a
> > stupid
> > > > question but I can not get it to work !
> > > >
> > > > Layout
> > > >
> > > > OSPF Area 1 Area 0
> > > > 192.2.2.0/24----|
> > > > |--R1-----R2
> > > > 135.1.x.0/24----|
> > > >
> > > > I do not want to see 192.2.2.0/24 on router R2 !
> > > >
> > > > I tried distribute-list out on R1 and in on R2 but no luck !
> > > >
> > > > Thank you in advance !
> > > >
> > > > Ken
> > > >
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 08:24:55 GMT-3