From: Fred Ingham (fningham@xxxxxxxxxxxxxxxx)
Date: Thu Dec 07 2000 - 17:36:07 GMT-3
First, recognize that you will never be able to have the 134.1.32.0/20
network in the r4 routing table when r4 has /24
networks. r4 will only accept classful routes, /24 routes, and host /32
routes. These are the routes visible in the r4 routing table.
The default network is entered as classful so 134.1.32.0 will be
134.1.0.0, the same as 134.1.31.0. So using 134.1.32.0 as the default
network won't work.
The summary address on r3 ospf 1 is counter to the problem directions
and as you see doesn't get the route distributed. This was a hack in
earlier IOS versions that sometimes worked but in current IOS versions
does not produce the desired result.
The statements you want to add to r3 are:
ip default-network 150.100.0.0
and under router igrp 1:
network 150.100.0.0
You should also add a default-metric under igrp 1 so that the ospf
routes will be redistributed. As far as I know there is no default
metric for IGRP so I'm puzzled that 150.100 is in r4's routing table
without a metric.
Try it and you should see that the gateway of last resort is 134.1.31.1
network 150.100.0.0 and the entry in the routing table for 150.100.0.0
will have an I* to indicate a candidate default. Once you see this you
can ping the 134.1.32.x addresses from r4.
You also need to redistribute igrp 1 into ospf on r3 otherwise r2 will
not be able to ping the r4 150.200.2.1 interface.
Let me know how you fare.
Cheers, Fred.
Robert DeVito wrote:
>
> Going back to the following scenerio:
>
> Configure IGRP between R3 and R4. Ensure that all routers in the
> network can access all interfaces on all the routers. Configuring
> ONLY R3, send a default route to R4 without using static routes,
> route maps, or summary addresses.
>
> R2 (E0 - 134.1.32.1/20)
> |e0
> | OSPF Area 0
> |e0
> R3 (E0 - 134.1.32.2/20, S0 - 134.1.31.1/24)
> \s0
> \ IGRP
> \s0
> R4 (s0 - 134.1.31.2/24)
>
> I have having a hard time getting the 134.1.32.X network to be redistributed
> into IGRP. Here are my configs. I am asumming that after I am able to get
> the 134.1.32.X network to redistribute into IGRP, I would add the "ip
> default-netw 134.1.32.0" command to r3, then redistribute IGRP into OSPF in
> R3, and that problem should be solved?????
>
> Thanx in advanced.
>
> R3 Config:
> interface Ethernet0/0
> ip address 134.1.32.2 255.255.240.0
> ip irdp
> ip irdp multicast
> ip irdp preference 600
> !
> interface Serial0/0
> ip address 134.1.31.1 255.255.255.0
> no ip mroute-cache
> clockrate 2000000
> !
> router ospf 1
> summary-address 134.1.32.0 255.255.255.0
> redistribute connected
> network 134.1.32.0 0.0.0.255 area 0
> default-metric 100
> !
> router igrp 1
> redistribute ospf 1
> passive-interface Ethernet0/0
> network 134.1.0.0
> !
> ip classless
> !
> Gateway of last resort is not set
>
> 134.1.0.0/16 is variably subnetted, 4 subnets, 3 masks
> O IA 134.1.3.0/24 [110/74] via 134.1.32.1, 00:00:28, Ethernet0/0
> C 134.1.31.0/24 is directly connected, Serial0/0
> C 134.1.32.0/20 is directly connected, Ethernet0/0
> O IA 134.1.48.0/25 [110/84] via 134.1.32.1, 00:00:28, Ethernet0/0
> 150.100.0.0/24 is subnetted, 1 subnets
> O E2 150.100.1.0 [110/500] via 134.1.32.1, 00:00:28, Ethernet0/0
> I 150.200.0.0/16 [100/8976] via 134.1.31.2, 00:00:11, Serial0/0
>
> Router 4 Config:
> ip subnet-zero
> no ip domain-lookup
> !
> interface Loopback0
> ip address 150.200.2.1 255.255.255.0
> !
> interface Serial0
> ip address 134.1.31.2 255.255.255.0
> no fair-queue
> !
> interface Serial1
> no ip address
> shutdown
> !
> interface TokenRing0
> no ip address
> shutdown
> !
> router igrp 1
> network 150.200.0.0
> network 134.1.0.0
> !
> ip classless
> !
> Gateway of last resort is not set
>
> 150.200.0.0/24 is subnetted, 1 subnets
> C 150.200.2.0 is directly connected, Loopback0
> 134.1.0.0/24 is subnetted, 2 subnets
> I 134.1.3.0 [100/52100] via 134.1.31.1, 00:00:52, Serial0
> C 134.1.31.0 is directly connected, Serial0
> I 150.100.0.0/16 [100/52100] via 134.1.31.1, 00:00:52, Serial0
>
> **** As you can see, I can see other routes that are being redistributed
> into IGRP from OSPF, I just can not see the 134.1.32.X network.
>
> ----Original Message Follows----
> From: Fred Ingham <fningham@worldnet.att.net>
> Reply-To: fningham@worldnet.att.net
> To: Robert DeVito <robertdevito@hotmail.com>
> Subject: Re: Wording
> Date: Wed, 06 Dec 2000 20:23:22 -0500
>
> Or better yet an OSPF route that is a different subnet. For instance if
> you configured r3-r4 link with 172.16.65.0/24
> you couldn't use 172.16.0.0 as the default network. If the link
> between r3-r2 were 172.17.x.y then you could use 172.17.0.0 as the
> default network.
>
> The network must exist in the routing table (of r3) as a connected,
> static, or learned route. You could configure 10.1.1.3 as a loopback on
> r3 and use 10.0.0.0 as the default network for instance. Remember to
> advertise the default network under IGRP on r3 with a network statement.
>
> Fred.
>
> Robert DeVito wrote:
> >
> > Fred,
> >
> > I am assuming if I can not use the classless address of the link
> > between R3 and R4 as the "default-network", I would have to append the
> > ip default-network command to a OSPF learned network? i.e. the link
> > between R3 and R2??
> >
> > Robert
> >
> > ----Original Message Follows----
> > From: Fred Ingham
> > Reply-To: Fred Ingham
> > To: Robert DeVito , ccielab@groupstudy.com
> > Subject: Re: Wording
> > Date: Wed, 06 Dec 2000 17:05:49 -0500
> > You also would have to redistribute IGRP into OSPF on r3 to ping the
> > R4
> > addresses from r2. Best to use route maps on both OSPF and IGRP
> > redistributions to prevent routing loops. Default network is the way
> > to
> > get a default into IGRP. The default network should be in r3's routing
> > table and not the same classful address configured on r4. r4 should
> > have the ip classless command and check that the r4 interface to r3
> > has
> > split horizon enabled.
> > Fred.
> > Robert DeVito wrote:
> > >
> > > R2
> > > |
> > > | Area 0
> > > |
> > > R3-------------------R4
> > >
> > > OSPF is configured between R2 and R3 (working good). I am trying to
> > > figure out what they mean below and how would you do that? Would you
> > > configure IGRP between R3 and R4 and then redistribute OSPF into
> > IGRP
> > > and use the " ip default-network" in R3?
> > >
> > > Configure IGRP between R3 and R4. Ensure that all routers in the
> > > network can access all interfaces on all the routers. Configuring
> > > ONLY R3, send a default route to R4 without using static routes,
> > route
> > > maps, or summary addresses.
> > >
> > > Thank you,
> > > Robert DeVito
> > >
> > >
> > ----------------------------------------------------------------------
> > > Get more from the Web. FREE MSN Explorer download :
> > > http://explorer.msn.com
> > >
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