Okay, I have disabled split horizon on the interfaces between r0 and r2. It now works
I need to understand what is going on here. I thought split horizon would stop a router sending an update out the interface it received it on. In this case these are routes originating from different sources, but for the same subnet,.. ? Sent from my iPhone On 9 Mar 2010, at 10:11, Mark Beynon <[email protected]> wrote: > The whole scenario is based around providing resillience. Hence why > the route is redistributed at both r1 and r2. In production r0 > represents a eigrp domain who need to learn the routes. > > The intention is that as soon r1 redistributes the static, r2 should > hear it, and place it in it's route table due to better ad. Removing > the static. > > However, you are correct, if I don't redistribute the static at r2 the > failover an fail back works fine. > > Doesn't solve my problem however. > > Why is the redistribution stopping this? > > > > Sent from my iPhone > > On 9 Mar 2010, at 09:50, Markku Leiniö <[email protected]> wro > te: > >> Hi, on R2 you are redistributing the static route (45.45.45.45/32) to >> EIGRP. Could that be the reason for this issue? >> >> Markku >> >> >> On Tue, Mar 9, 2010 at 11:28 AM, Mark Beynon <[email protected]> >> wrote: >>> >>> I have now reproduced this from scratch, using different router >>> models in >>> GNS3. As mentioned before this works fine in OSPF, but does not >>> work in >>> EIGRP. >>> >>> i have removed all complications, and i am now simply >>> redistributing a >>> static route to null0 on one side of the network. At the other, a >>> floating >>> static route to the same address via null0 with an AD of 210. >>> >>> when the remote route is removed, the floating static enters the >>> routing >>> table. when it is re-added remotely, the floating static is not >>> removed. >>> >>> Heres the weird thing. >>> >>> If i do this on a chain of two routers, it works perfectly. >>> if i extend the chain to three routers, it doesn't. >>> >>> configs pasted. R1 left hand router where routes are added and >>> removed. >>> R0 middle router. >>> R2 left hand router with floating static. >>> >>> >>> just in case any one can reproduce for me.. :) >>> >>> thanks >>> >>> config >>> >>> ! >>> version 12.4 >>> service timestamps debug datetime msec >>> service timestamps log datetime msec >>> no service password-encryption >>> ! >>> hostname R1 >>> ! >>> boot-start-marker >>> boot-end-marker >>> ! >>> ! >>> no aaa new-model >>> memory-size iomem 15 >>> ip cef >>> ! >>> ! >>> ! >>> ! >>> ! >>> ! >>> ! >>> ! >>> ! >>> ! >>> ! >>> interface FastEthernet0/0 >>> ip address 10.10.10.10 255.255.255.0 >>> duplex auto >>> speed auto >>> ! >>> interface FastEthernet0/1 >>> no ip address >>> shutdown >>> duplex auto >>> speed auto >>> ! >>> router eigrp 1 >>> redistribute static >>> network 10.10.10.0 0.0.0.255 >>> no auto-summary >>> ! >>> ip forward-protocol nd >>> ip route 45.45.45.45 255.255.255.255 Null0 >>> ! >>> ip http server >>> no ip http secure-server >>> ! >>> ! >>> control-plane >>> ! >>> ! >>> line con 0 >>> line aux 0 >>> line vty 0 4 >>> login >>> ! >>> ! >>> end >>> >>> >>> >>> >>> ! >>> version 12.4 >>> service timestamps debug datetime msec >>> service timestamps log datetime msec >>> no service password-encryption >>> ! >>> hostname R0 >>> ! >>> boot-start-marker >>> boot-end-marker >>> ! >>> ! >>> no aaa new-model >>> memory-size iomem 15 >>> ip cef >>> ! >>> ! >>> ! >>> ! >>> ! >>> ! >>> ! >>> ! >>> ! >>> ! >>> ! >>> interface FastEthernet0/0 >>> ip address 10.10.10.1 255.255.255.0 >>> duplex auto >>> speed auto >>> ! >>> interface FastEthernet0/1 >>> ip address 20.20.20.2 255.255.255.0 >>> duplex auto >>> speed auto >>> ! >>> router eigrp 1 >>> redistribute static >>> network 10.10.10.0 0.0.0.255 >>> network 20.20.20.0 0.0.0.255 >>> no auto-summary >>> ! >>> ip forward-protocol nd >>> ip route 55.55.55.55 255.255.255.255 Null0 >>> ! >>> ip http server >>> no ip http secure-server >>> ! >>> ! >>> control-plane >>> ! >>> ! >>> line con 0 >>> line aux 0 >>> line vty 0 4 >>> login >>> ! >>> ! >>> end >>> >>> >>> ! >>> version 12.4 >>> service timestamps debug datetime msec >>> service timestamps log datetime msec >>> no service password-encryption >>> ! >>> hostname R2 >>> ! >>> boot-start-marker >>> boot-end-marker >>> ! >>> ! >>> no aaa new-model >>> memory-size iomem 15 >>> ip cef >>> ! >>> ! >>> ! >>> ! >>> ! >>> ! >>> ! >>> ! >>> ! >>> ! >>> ! >>> interface FastEthernet0/0 >>> ip address 20.20.20.20 255.255.255.0 >>> duplex auto >>> speed auto >>> ! >>> interface FastEthernet0/1 >>> no ip address >>> shutdown >>> duplex auto >>> speed auto >>> ! >>> router eigrp 1 >>> redistribute static >>> network 20.20.20.0 0.0.0.255 >>> no auto-summary >>> ! >>> ip forward-protocol nd >>> ip route 45.45.45.45 255.255.255.255 Null0 210 >>> ip route 55.55.55.55 255.255.255.255 Null0 210 >>> ! >>> ip http server >>> no ip http secure-server >>> ! >>> ! >>> control-plane >>> ! >>> ! >>> line con 0 >>> line aux 0 >>> line vty 0 4 >>> login >>> ! >>> ! >>> end >>> >>> _______________________________________________ >>> For more information regarding industry leading CCIE Lab training, >>> please >>> visit www.ipexpert.com >>> >>> >> >> >> >> -- >> Markku > _______________________________________________ > For more information regarding industry leading CCIE Lab training, > please visit www.ipexpert.com _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
