Ben while I do agree with you that with his two router scenario below the default route won't come in, what happens if we add a third router running RIP on the left hand side?
R3--RIP--R1--EIGRP--R2 Now let's advertise the default route from R3 to R1 VIA RIP and then blindly redistribute RIP into EIGRP on R1. What will happen now? Let's look on R1 first to see if he's getting the default route from R3: R1(config)#do s ip ro | i 0.0.0.0 Gateway of last resort is 13.13.13.3 to network 0.0.0.0 R* 0.0.0.0/0 [120/1] via 13.13.13.3, 00:00:04, FastEthernet0/1 Looks good now let's turn on debugging and then redistribute between RIP and EIGRP on R1 R1(config)#router rip R1(config-router)#redistribute eigrp 12 metric 5 R1(config-router)#router eigrp 12 R1(config-router)#red rip met 1000 1 255 1 1500 And now on R2 we have the RIP created default route *Mar 1 00:22:45.243: RT: NET-RED 0.0.0.0/0 *Mar 1 00:22:45.243: RT: default path is now 0.0.0.0 via 12.12.12.1 *Mar 1 00:22:45.247: RT: new default network 0.0.0.0 *Mar 1 00:22:45.247: RT: NET-RED 0.0.0.0/0 R2(config)#do sh ip route | in 0.0.0.0 Gateway of last resort is 12.12.12.1 to network 0.0.0.0 D*EX 0.0.0.0/0 [170/2585856] via 12.12.12.1, 00:01:33, FastEthernet0/0 So the point is it is possible to grab a default route from another IGP when you are redistributing like that, just watch the scenario to make sure this is something you want to do. If not block the default route from coming in on the redistribute line: R1(config)#ip prefix-list DEFAULT permit 0.0.0.0/0 R1(config)#Route-map NO-DEFAULT deny 10 R1(config-route-map)# Match ip address prefix-list DEFAULT R1(config-route-map)#Route-map NO-DEFAULT permit 90 R1(config)#router eigrp 12 R1(config-router)#red rip met 1000 1 255 1 1500 route-map NO-DEFAULT Now we can see that default route being removed from R2's routing table *Mar 1 00:27:04.171: RT: no routes to 0.0.0.0 *Mar 1 00:27:04.175: RT: NET-RED 0.0.0.0/0 *Mar 1 00:27:04.175: RT: NET-RED 0.0.0.0/0 *Mar 1 00:27:04.175: RT: delete network route to 0.0.0.0 *Mar 1 00:27:04.175: RT: NET-RED 0.0.0.0/0 R2(config)#do sh ip route 0.0.0.0 % Network not in table Here are the configs I used for testing... R3 interface FastEthernet0/1 ip address 13.13.13.3 255.255.255.0 ! router rip version 2 network 13.0.0.0 default-information originate no auto-summary -- R1 interface FastEthernet0/0 ip address 12.12.12.1 255.255.255.0 router eigrp 12 network 12.12.12.1 0.0.0.0 no auto-summary interface FastEthernet0/1 ip address 13.13.13.1 255.255.255.0 router rip version 2 network 1.0.0.0 network 13.0.0.0 no auto-summary -- R2 interface FastEthernet0/0 ip address 12.12.12.2 255.255.255.0 router eigrp 12 network 12.12.12.0 0.0.0.255 no auto-summary -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Ben Hughes Sent: Tuesday, November 29, 2011 9:40 PM To: Hamed Shittu; [email protected] Subject: Re: [OSL | CCIE_RS] default-information-originate how it works between igps, does it? Hi Hamed, Adding the default-information originate command under the RIP process won't create a default route in the routing table of RtrA. Cheers, Ben. From: Hamed Shittu <[email protected]<mailto:[email protected]>> Date: Wed, 30 Nov 2011 15:50:59 +1100 To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Subject: [OSL | CCIE_RS] default-information-originate how it works between igps, does it? All, Please, little help... I wanted to confirm if my assertion is correct. the route (default route) generated by "default-information originate" command from one IGP protocol will not be used by another IGP protocol if the IGP is the only running IGP in the neigbor router. For instance: RtrA = runs rip and eigrp RtrB = runs only eigrp RtrA is performing mutual redistribution between rip and eigrp. Perfect eigrp adjacency is formed between RtrA and RtrB. in RtrA (under router rip) rip has d"efault-information originate" and eigrp did not. Would RtrB has default route that rip will creat in RtrA. Many thanks, Hamed humbleness is a trait of smart student ------------------------------------------------------------------------------ This electronic mail (including any attachments) may contain information that is privileged, confidential, and/or otherwise protected from disclosure to anyone other than its intended recipient(s). Any dissemination or use of this electronic email or its contents (including any attachments) by persons other than the intended recipient(s) is strictly prohibited. If you have received this message in error, please notify us immediately by reply email so that we may correct our internal records. Please then delete the original message (including any attachments) in its entirety. Thank you. _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? 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