From: Jason (jgraun@xxxxxxxxx)
Date: Thu Apr 04 2002 - 00:38:42 GMT-3
I have had problems with that in the past, I would be very careful when
using that cause to it may not work in every case. What is the mask
between R2 and R4? Also how do you remove the null 0 route from the
routing table?
Have fun with that
Jason
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
John Neiberger
Sent: Wednesday, April 03, 2002 8:41 PM
To: Lupi, Guy; 'Warren J Dubose '
Cc: ''Mas Kato' '; 'ccielab@groupstudy.com '
Subject: Re: RE: OSPF to IGRP redistribution (I know this has been
killed, th i s is short I promise)
At this point I'm not sure who is saying what! But I'd like to
chime in. I just did a test with three routers:
[R3]-----(IGRP)-----[R2]-----(OSPF)------[R4]
The R2-R4 link is in area 0. R4 has a mixture of prefixes from
10/8 that are various lengths, all longer than /24. R3 to R2
is a /24, also in the 10/8 range.
As a test prefix I also added a /24 on R4. On R2 I turned on
OSPF to IGRP redistribution and, as expected, saw only
the /24. I then added a loopback on R2, also in 10/8, and
placed it into area 1. Then, for each prefix I added an 'area
0 range a.b.c.d 255.255.255.0'.
And now, on R3 I see:
R3#sho ip route
Gateway of last resort is not set
10.0.0.0/24 is subnetted, 6 subnets
I 10.3.1.0 [100/8976] via 10.2.1.1, 00:00:04, Serial0
C 10.2.1.0 is directly connected, Serial0
I 10.1.1.0 [100/9666] via 10.2.1.1, 00:00:04, Serial0
I 10.1.30.0 [100/9666] via 10.2.1.1, 00:00:04, Serial0
I 10.1.20.0 [100/9666] via 10.2.1.1, 00:00:04, Serial0
I 10.1.40.0 [100/9666] via 10.2.1.1, 00:00:04, Serial0
R3#
All of the above except for two were originally not /24
prefixes. So, at least in some cases, an area 0 range command
works just fine. If you redistribute OSPF into IGRP, IGRP will
pick up the summarized routes pointing at Null0.
John
---- On Wed, 3 Apr 2002, Lupi, Guy (Guy.Lupi@eurekaggn.com)
wrote:
> I have a loopback on it that I put in area 1, is that no
good? Anyway,
> here
> is the config and routing table for r1, the summary route to
null 0 is
> there, is that not allowed on the lab? It isn't a static
route, thanks
> for
> your time.
>
> r1#sh ip route
> 141.63.0.0/16 is variably subnetted, 7 subnets, 4 masks
> O 141.63.1.0/24 is a summary, 04:54:06, Null0
> C 141.63.1.0/26 is directly connected, Loopback0
> C 141.63.7.0/24 is directly connected, Serial0
> C 141.63.7.0/25 is directly connected, Serial0
> O IA 141.63.5.0/27 [110/65] via 141.63.7.5, 02:53:23,
Serial0
> C 141.63.10.0/25 is directly connected, Loopback99
> C 141.63.12.0/24 is directly connected, Ethernet0
> r1#
>
> r1#sh run
> Building configuration...
>
> Current configuration : 1532 bytes
> !
> version 12.1
> no service single-slot-reload-enable
> service timestamps debug uptime
> service timestamps log uptime
> no service password-encryption
> !
> hostname r1
> !
> logging rate-limit console 10 except errors
> no logging console
> !
> ip subnet-zero
> no ip finger
> no ip domain-lookup
> !
> cns event-service server
> !
> !
> !
> !
> !
> interface Loopback0
> ip address 141.63.1.1 255.255.255.192
> ip ospf network point-to-point
> !
> interface Loopback99
> ip address 141.63.10.1 255.255.255.128
> ip ospf network point-to-point
> !
> interface Ethernet0
> ip address 141.63.12.1 255.255.255.0
> !
> interface Ethernet1
> no ip address
> shutdown
> !
> interface Serial0
> ip address 141.63.7.11 255.255.255.0 secondary
> ip address 141.63.7.1 255.255.255.128
> encapsulation frame-relay
> ip ospf network broadcast
> no fair-queue
> no arp frame-relay
> frame-relay map ip 141.63.7.5 115 broadcast
> no frame-relay inverse-arp
> !
> interface Serial1
> no ip address
> shutdown
> !
> router ospf 100
> log-adjacency-changes
> area 0 range 141.63.5.0 255.255.255.0
> summary-address 141.63.1.0 255.255.255.0
> redistribute connected subnets
> network 141.63.7.0 0.0.0.127 area 0
> network 141.63.10.0 0.0.0.127 area 1
> !
> router igrp 100
> redistribute ospf 100
> passive-interface default
> no passive-interface Ethernet0
> network 141.63.0.0
> default-metric 1500 128 128 128 128
> !
> ip kerberos source-interface any
> ip classless
> no ip http server
> !
> !
> !
> line con 0
> transport input none
> line aux 0
> line vty 0 4
> login
> !
> end
>
> r1#
>
> -----Original Message-----
> From: Warren J Dubose
> To: Lupi, Guy
> Cc: 'Mas Kato'; ccielab@groupstudy.com
> Sent: 4/3/2002 5:13 PM
> Subject: RE: OSPF to IGRP redistribution (I know this has
been killed,
> thi
> s is short I promise)
>
> Guy,
>
> MAS is correct.
>
> How can r1 belong to 2 areas when it is connected to r1
talking IGRP?
>
> There are two types of summarization in ospf:
>
> Intra-area route summarization
> ---- summarization can occur at two points in an OSPF network
at
> "AREA BORDERS", where ABRs can be configured to announce a
single
> Summary
> LSA for the range of networks residing within a "specific
area"
>
> Inter-routing Domain Route Summarization
> --- on ASBRs at "route redistribution points" where ospf
routes are
> being
> exported to another routing protocol, or non-ospf routes are
being
> imported into opsf.
>
> Check out Doyle's or Caslow's book pertaining to
summarization of OSPF.
> This should help ;)
>
> Regards,
> Warren
>
>
>
> On Wed, 3 Apr 2002, Lupi, Guy wrote:
>
> > Right, that is what I did, R1 is a member of 2 areas, area
1 and area
> 0.
> > Here is a partial output of "show ip ospf". This is why I
don't
> understand
> > why it isn't working. I thought that as long as the router
was an
> ABR, you
> > could use area range to summarize and inject into IGRP.
> >
> > r1#sh ip os
> > Routing Process "ospf 100" with ID 141.63.10.1 and Domain
ID
> 0.0.0.100
> > Supports only single TOS(TOS0) routes
> > Supports opaque LSA
> > It is an area border and autonomous system boundary router
> >
> > -----Original Message-----
> > From: Mas Kato [mailto:loomis_towcar@speedracer.com]
> > Sent: Wednesday, April 03, 2002 4:30 PM
> > To: Lupi, Guy
> > Cc: ccielab@groupstudy.com
> > Subject: RE: OSPF to IGRP redistribution (I know this has
been killed,
> > this is short I promise)
> >
> >
> > Guy,
> >
> > Although router1 is certainly an ASBR, it really doesn't
become an ABR
> until
> > it becomes a member of two or more OSPF areas. If you hung
another
> > OSPF-speaking router off of router1 and placed it in an
area different
> from
> > router5, you would then see the results of your 'area
range' command
> on that
> > new router, because that new router would know how to read
the type 3
> > summary LSAs being originated by router1.
> >
> > Regards,
> >
> > Mas Kato
> > https://ecardfile.com/id/mkato
> >
> > > "Lupi, Guy"
<Guy.Lupi@eurekaggn.com> "'ccielab@groupstudy.com'"
> > <ccielab@groupstudy.com>Date: Wed, 3 Apr 2002 14:44:12 -0500
> > >Reply-To: "Lupi, Guy" <Guy.Lupi@eurekaggn.com>
> > >
> > >I know this has been covered in detail before, I just want
to verify
> > >something. I have the following:
> > >
> > >router2---------router1--------router5
> > >
> > >Router 5 and router 1 are OSPF, router 2 and router 1 is
igrp only.
> I know
> > >how to use the secondary address, tunnel, and route-map
methods. I
> know
> > how
> > >to use summary address on router 1 to get connected routes
that are
> not in
> > >OSPF onto router 2. I cannot get routes from router 5 to
router 2
> using
> > >area range on router 1. Router 1 is an ASBR, and an ABR.
I cannot
> use the
> > >area range command to get the route from r5 to r2, and
summary
> address
> > would
> > >never work, but tunnels, route-maps, and secondary
addresses work. I
> > >thought that if the router was an ABR, you could do "area-
range [area
> route
> > >is from] x.x.x.x x.x.x.x". Thanks.
> >
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:57:53 GMT-3