Mark, I don't understand the scenario. What's the topology? What are you trying to do?
On Tue, Mar 9, 2010 at 3:41 AM, Mark Beynon <[email protected]> wrote: > "the split horizon rule prohibits a router from advertising a route > through an interface that the router itself uses to reach the > destination." > > So in my scenario router 0 is learning a route via fa0/1 an router 2 > when the same subnet is learnt from router 1 on fa0/0. > > This would exlain it, but I do see a routing update reach router 2 for > this subnet in a debug ip eigrp. > > This must be the problem, but I don't think I can fix it. Don't want > to turn off split horizon in the eigrp domain.. > > Time for a rethink > > Sent from my iPhone > > On 9 Mar 2010, at 10:27, Mark Beynon <[email protected]> wrote: > > > 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 > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > -- Bryan Bartik CCIE #23707 (R&S, SP), CCNP Sr. Support Engineer - IPexpert, Inc. 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