From: Connary, Julie Ann (jconnary@xxxxxxxxx)
Date: Tue Jan 16 2001 - 16:23:43 GMT-3
Hi Padhu - got it to work.
Somehow under IGRP there was the command no default-information out -
probably left over from playing with
that earlier. I could not get rid of it so I just redid my whole IGRP setup
and it worked with the loopback and with redistributing
the ospf route of 210.0.5.0 and using that in the default-network command.
So to summarize:
1 chose a network outside of your address space -
2. setup default network to it
3, advertise route to downstream neighbors and they will see that as a
default-route - because it will be advertised as an external igrp route.
advertisement can be via redistribution (ospf in my case) or as
you suggested, use a loopback to a ficticous network and
put a network statement under IGRP.
Bottom line is the network has to get to the routing table of the
downstream router as an external route IGRP route. It is advertised as
an external IGRP route when it is a candidate default route. The best
candidate default route is used as gateway-of last resort.
whew ---- I hope I got that right - seems to be what I got to work. 2 days
of studying redistribution - I'm moving on for now - brain dead
on that subject.
Are there ficticous network space that we can use in the lab? Or should you
choose the 10 or 198 networks - the networks that
are considered unroutable in the internet? - Can't remember the exact
numbers right now.
Thanks,
Julie Ann
At 12:57 PM 1/16/2001 -0600, Padhu (LFG) wrote:
>Julie,
>
>Lets do this one step at a time ...Do not redistribute OSPF or anything else
>into IGRP..
>from R5 just send that 30 net down ...also put in default metric on both R5
>and R4 and let me know if you see the 30 net advertised in R5 and seen on R4
>..
>
>Cheers,Padhu
>
>
>-----Original Message-----
>From: Connary, Julie Ann [mailto:jconnary@cisco.com]
>Sent: Tuesday, January 16, 2001 12:35 PM
>To: Desyatnik, Yan
>Cc: ccielab@groupstudy.com
>Subject: RE: propagating default-networks - RIP V2 and IGRP -
>
>
>I redistributed OSPF into IGRP so that the 210.0.5.0 network would be in R4
>- still no default.
>then I turned on debug on R4 and noticed that it was not receiving any
>exterior routes from R5 - and the documentation clearly
>states that default-routes in IGRP are flagged as external routes.
>
>Here is the debug from R4:
>
>
>
>
>02:01:10: IGRP: Update contains 7 interior, 1 system, and 0 exterior
>routes. <--------this is the update from R5
>02:01:10: IGRP: Total routes in update: 8
>02:01:10: IGRP: edition is now 18
>02:01:10: IGRP: sending update to 255.255.255.255 via Serial0 (170.100.1.4)
>02:01:10: subnet 170.100.200.0, metric=1100
>02:01:10: IGRP: Update contains 1 interior, 0 system, and 0 exterior routes.
>02:01:10: IGRP: Total routes in update: 1
>02:01:10: RT: add 205.15.150.0/24 via 170.100.200.7, bgp metric [20/0]
>
>
>and on R5 - it shows it is not sending any exterior routes either:
>
>00:25:35: IGRP: sending update to 255.255.255.255 via Serial0.1
>(170.100.1.5)
>00:25:35: subnet 170.100.233.0, metric=8476
>00:25:35: subnet 170.100.129.0, metric=8476
>00:25:35: subnet 170.100.150.0, metric=8476
>00:25:35: subnet 170.
>02:04:48: IGRP: Total routes in update: 8100.68.0, metric=8476
>00:25:35: subnet 170.100.64.0, metric=8476
>00:25:35: subnet 170.100.65.0, metric=8476
>00:25:35: subnet 170.100.42.0, metric=8476
>00:25:35: network 210.0.5.0, metric=8476
>00:25:36: IGRP: Update contains 7 interior, 1 system, and 0 exterior routes.
>00:25:36: IGRP: Total routes in update: 8
>
>
>hmmmmmmmmmmmmmmmm - the version of IOS on R5 is 12.09 and it is 12.1 on R4.
>
>I'm going to put 11.2 back on R5 and see what happens.
>
>
>Julie Ann
>
>
>At 01:15 PM 1/16/2001 -0500, Desyatnik, Yan wrote:
> >Network that you select as default has to be in your downstream neighbor
> >routing table or it will no install it. You are correct about everything
> >else. Also, if running old code 11.0 and below make sure IP Classless is
>on.
> >Try pointing default network to 205.15.150.0 on R5.
> >
> >Yan
> >
> >
> > -----Original Message-----
> > From: Connary, Julie Ann [mailto:jconnary@cisco.com]
> > Sent: Tuesday, January 16, 2001 1:00 PM
> > To: ccielab@groupstudy.com
> > Subject: propagating default-networks - RIP V2 and
> >IGRP -
> >
> > Hi All,
> >
> > I know there have been many discussions on this - but what
>I
> >don't
> > understand is how to get IGRP to propagate a
> >default-network. I understand
> > the defualt-network has to point to a network that is not
>in
> >the same
> > address space as IGRP and it must be classfull.
> > But why does it not propagate to downstream neighbors?
> >
> > Here is the scenario - R5 is redistributing from IGRP into
> >OSPF and RIP V2
> > into OSPF. I do not want
> > to redistribute OSPF into IGRP or RIP V2 - but use a
> >default-network instead.
> >
> >
> >
> > R7---Rip V2
> > |
> > |E 0 - 170.100.42.241/28
> > |
> > R5 -------- S0.2 ------------R3 -----s0
> > ------------------r6-------205.0.5.0 AND non 24 bit
>170.100
> >networks off of R6
> > | 170.100.65.0/24 170.100.68.0/24
> > | OSPF
> > |
> > |
> > S0.1 - igrp - 170.100.1.0/24
> > |
> > R4
> >
> >
> > So, I put in R5 the following command:
> >
> > ip default-network 205.0.5.0
> >
> > and I got a gateway of last resort in R5. (I also tried
> >setting the ip
> > default-network to 170.100.65.0, but that just installed a
> >static route and
> > no gateway of last resort). However IGRP is not
>propagating
> >this default to
> > R4. Is this because 205.0.5.0 is an OSPF learned
> > route? R4 has no knowledge of the 210.0.5.0 network -
> >however, I thought
> > that R5 would source down
> > to R4 that it had a default and R4 would have a gateway of
> >last resort to
> > R5. R7, the Rip V2 router does receive the default network
> >and it points it
> > toward R5. Am I missing something here?
> >
> > Here is my routing table:
> >
> > Gateway of last resort is 170.100.65.3 to network
>210.0.5.0
> >
> > 170.100.0.0/16 is variably sub
> > 01netted, 13 subnets, 3 masks
> > I 170.100.200.0/24 [100/8576] via 170.100.1.4,
> >00:00:50, Serial0.1
> > C 170.100.42.240/28 is directly connected, Ethernet0
> > O IA 170.100.233.1/32 [110/75] via 170.100.65.2,
> >00:25:04, Serial0.2
> > O IA 170.100.233.0/24 [110/65] via 170.100.65.3,
> >00:25:04, Serial0.2
> > O E2 170.100.129.0/24 [110/20] via 170.100.65.2,
> >00:25:04, Serial0.2
> > O E2 170.100.150.0/24 [110/20] via 170.100.65.3,
> >00:25:04, Serial0.2
> > O IA 170.100.68.0/24 [110/128] via 170.100.65.3,
> >00:25:04, Serial0.2
> > O IA 170.100.67.6/32 [110/129] via 17:05:06:
> >%SYS-5-CONFIG_I: Configured
> > from
> > console by console0.100.65.3, 00:25:04, Serial0.2
> > C 170.100.66.0/28 is directly connected, BRI0
> > O IA 170.100.64.0/24 [110/74] via 170.100.65.2,
>00:25:04,
> >Serial0.2
> > [110/74] via 170.100.65.3,
> >00:25:04, Serial0.2
> > C 170.100.65.0/24 is directly connected, Serial0.2
> > C 170.100.1.0/24 is directly connected, Serial0.1
> > O 170.100.42.0/24 is a summary, 00:25:01, Null0
> > R 1.0.0.0/8 [120/1] via 170.100.42.242, 00:00:10,
> >Ethernet0
> > R 20.0.0.0/8 [120/1] via 170.100.42.242, 00:00:10,
> >Ethernet0
> > O*E2 210.0.5.0/24 [110/20] via 170.100.65.3, 00:25:07,
> >Serial0.2
> > I 205.15.150.0/24 [100/14000] via 170.100.1.4,
>00:00:54,
> >Serial0.1
> >
> > Here is the routing table on R4
> >
> > Gateway of last resort is not set
> >
> > 170.100.0.0/24 is subnetted, 3 subnets
> > C 170.100.200.0 is directly connected, Ethernet0
> > I 170.100.65.0 [100/10476] via 170.100.1.5,
>00:01:13,
> >Serial0
> > C 170.100.1.0 is directly connected, Serial0
> > 1.0.0.0/24 is subnetted, 1 subnets
> > C 1.1.1.0 is directly connected, Loopback0
> > B 205.15.150.0/24 [20/0] via 170.100.200.7, 00:36:34
> >
> >
> >
> > Also - does anyone understand how to use the
> >defualt-information command
> > under igrp?
> > It says it requires an access-list - but the examples in
>the
> >docs do not
> > use access-lists.
> >
> > Thanks,
> >
> > Julie Ann
> >
> >------------------------------------------------------------------------
> > Julie Ann Connary
> > | | Network
>Consulting
> >Engineer
> > ||| ||| Federal Support
> >Program
> > .|||||. .|||||. 13635 Dulles
> >Technology Drive,
> > Herndon VA 20171
> > .:|||||||||:.:|||||||||:. Pager:
> >1-888-642-0551
> > c i s c o S y s t e m s Email: jconnary@cisco.com
> >
> >
> >------------------------------------------------------------------------
> >
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