From: Wang, Roger (Roger@xxxxxxxxxxxx)
Date: Tue Apr 17 2001 - 20:16:38 GMT-3
Glen,
Disabling split horizon did the trick. Hmm, I wonder why. Thanks for your
help.
Rog
> -----Original Message-----
> From: Glen Lavers [mailto:glavers@cisco.com]
> Sent: Tuesday, April 17, 2001 6:43 PM
> To: Wang, Roger; ccielab@groupstudy.com
> Subject: RE: IGRP route advertisement
>
>
> I have it working without disabling split-horizon, different
> address same
> prefixes and concept. Go figure.
> Glen
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> Glen Lavers
> Sent: Wednesday, April 18, 2001 12:13 AM
> To: Wang, Roger; ccielab@groupstudy.com
> Subject: RE: IGRP route advertisement
>
>
> I just tried it and it works, but you have to disable
> split-horizon on s0.
> Here's an example and debugs:
> -Glen
> R1#sh run
> !
> hostname R1
> !
> !
> ip subnet-zero
> !
> !
> interface Ethernet0/0
> ip address 172.16.77.130 255.255.255.128
> no ip directed-broadcast
> !
> interface Serial0/0
> ip address 172.16.66.5 255.255.255.128 secondary
> ip address 172.16.66.4 255.255.255.0
> no ip directed-broadcast
> no ip split-horizon
> no ip mroute-cache
> no fair-queue
> !
>
> R3#sh run
> Building configuration...
>
> Current configuration:
> !
> version 12.0
> service timestamps debug uptime
> service timestamps log uptime
> no service password-encryption
> !
> hostname R3
> !
> !
> ip subnet-zero
> !
> !
> !
> interface Ethernet0/0
> no ip address
> no ip directed-broadcast
> shutdown
> !
> interface Serial0/0
> ip address 172.16.66.7 255.255.255.128 secondary
> ip address 172.16.66.6 255.255.255.0
> no ip directed-broadcast
> no ip mroute-cache
> clockrate 64000
>
>
>
> Debugs: notice at first it only sends subnet 172.16.66.0 out
> e0/0 the once
> split-horizon is disabled it sends out 172.16.77.128 out s0/0:
>
> 00:47:38: IGRP: sending update to 255.255.255.255 via Serial0/0
> (172.16.66.4)
> 00:47:38: IGRP: Update contains 0 interior, 0 system, and 0
> exterior routes.
> 00:47:38: IGRP: Total routes in update: 0 - suppressing null update
> 00:48:53: IGRP: sending update to 255.255.255.255 via Ethernet0/0
> (172.16.77.130
> )
> 00:48:53: subnet 172.16.66.0, metric=8476
> 00:48:53: IGRP: Update contains 1 interior, 0 system, and 0
> exterior routes.
> 00:48:53: IGRP: Total routes in update: 1
> 00:48:53: IGRP: sending update to 255.255.255.255 via Serial0/0
> (172.16.66.4)
> 00:48:53: IGRP: Update contains 0 interior, 0 system, and 0
> exterior routes.
> 00:48:53: IGRP: Total routes in update: 0 - suppressing null update
> R1#
> R1#conf t
> Enter configuration commands, one per line. End with CNTL/Z.
> R1(config)#int s0/0
> R1(config-if)#no ip spl
> R1(config-if)#^Z
> R1#
> 00:49:27: %SYS-5-CONFIG_I: Configured from console by console
> R1#
> R1#
> 00:50:13: IGRP: sending update to 255.255.255.255 via Ethernet0/0
> (172.16.77.130
> )
> 00:50:13: subnet 172.16.66.0, metric=8476
> 00:50:13: IGRP: Update contains 1 interior, 0 system, and 0
> exterior routes.
> 00:50:13: IGRP: Total routes in update: 1
> 00:50:14: IGRP: sending update to 255.255.255.255 via Serial0/0
> (172.16.66.4)
> 00:50:14: subnet 172.16.66.0, metric=8476
> 00:50:14: IGRP: Update contains 1 interior, 0 system, and 0
> exterior routes.
> 00:50:14: IGRP: Total routes in update: 1
> 00:50:14: IGRP: sending update to 255.255.255.255 via Serial0/0
> (172.16.66.5)
> 00:50:14: subnet 172.16.77.128, metric=1100
> 00:50:14: subnet 172.16.66.0, metric=8476
> 00:50:14: IGRP: Update contains 2 interior, 0 system, and 0
> exterior routes.
> 00:50:14: IGRP: Total routes in update: 2
> R1#
> R1#
>
>
>
> R3#sh ip route
> Codes: C - connected, S - static, I - IGRP, R - RIP, M -
> mobile, B - BGP
> D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
> N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
> E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
> i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * -
> candidate
> default
> U - per-user static route, o - ODR
>
> Gateway of last resort is not set
>
> 172.16.0.0/16 is variably subnetted, 3 subnets, 2 masks
> I 172.16.77.128/25 [100/8576] via 172.16.66.5,
> 00:01:09, Serial0/0
> C 172.16.66.0/25 is directly connected, Serial0/0
> C 172.16.66.0/24 is directly connected, Serial0/0
> R3#
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> Glen Lavers
> Sent: Tuesday, April 17, 2001 11:43 PM
> To: Wang, Roger; ccielab@groupstudy.com
> Subject: RE: IGRP route advertisement
>
>
> RE: IGRP route advertisementWhat I meant is try placing
> 172.16.66.5/25 for
> example on s0 as a sec, as well as placing a /25 sec on the
> other end of the
> serial line. This should carry the e0 /25 route right through
> to the routing
> table of the router hanging off s0.
> Glen
>
>
> -----Original Message-----
> From: Wang, Roger [mailto:Roger@inteqnet.com]
> Sent: Tuesday, April 17, 2001 9:19 PM
> To: 'Glen Lavers'; ccielab@groupstudy.com
> Subject: RE: IGRP route advertisement
>
>
> I've tried that. The network of the secondary IP address
> (using, say,
> 172.16.70.4 /25) gets advertised, but somehow 172.16.77.4/25
> still did not.
>
> Rog
>
> > -----Original Message-----
> > From: Glen Lavers [mailto:glavers@cisco.com]
> > Sent: Tuesday, April 17, 2001 3:14 PM
> > To: Wang, Roger; ccielab@groupstudy.com
> > Subject: RE: IGRP route advertisement
> >
> >
> > You can place a secondary address with a /25 on the serial
> > int, it should
> > then advertise both /24 and /25 addresses. Give it a try, I
> > know I've used
> > this technique the otherway around for making a poorly
> > addressed VLSM to
> > FLSM topo work.
> > Cheers,
> > Glen
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com
[mailto:nobody@groupstudy.com]On Behalf Of
> Wang, Roger
> Sent: Tuesday, April 17, 2001 8:22 PM
> To: 'ccielab@groupstudy.com'
> Subject: IGRP route advertisement
>
>
> Hi, all,
>
> I have searched high and low in the archive and can't seem to
> find anything
> about it...
>
> I have a question about IGRP route advertisement. We all
> know that the
> advertisements from IGRP are only with the mask of the interface:
>
> 172.16.77.4/25--e0(R4)s0--172.16.66.4/24
>
> R4 is running IGRP. Is there way so that the /25 subnet (e0) can be
> advertised out interface s0 (on /24 subnet)? The other end of s0 is a
> router running both IGRP and OSPF where redistribution occurs.
>
> Thanks,
>
> Rog
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