Hi,
actually it is Eigrp that has a better AD than Igrp, 90 and 100,
respectively, the route u see in ur table has 170 as the AD, therefore
External EIGRP,caused by the implicit redistribution, imposed when using
these routing protocols with the same AS.
so u are having normal behavior of the protocols.
but i can't figure out why u r using IGRP in R3, since obviously he would
know about the routes.
Regards, Amar.

 a icrit dans le message de news:
[EMAIL PROTECTED]
> R1 ---- R2 ---- R3
>
>   router R1 is running igrp process 1
>   router R2 is running igrp process 1 and eigrp process 2
>   router R3 is running igrp process 1 and eigrp process 2
>
>   R1 is running IGRP on network 10.0.0.0.
>
>   I would expect R1 advertise router 10.0.0.0 to R2 via igrp and R2
>   advertise 10.0.0.0 via igrp to R3
>
>   But this is the result of R3 routing table:
>
>   R3#sh ip route
>
>
>   D    192.168.12.0/24 [90/2681856] via 192.168.23.1, 00:04:45, Serial0.32
>        3.0.0.0/24 is subnetted, 1 subnets
>   C       3.3.3.0 is directly connected, Loopback0
>   D EX 10.0.0.0/8 [170/2809856] via 192.168.23.1, 00:04:46, Serial0.32
>   C    192.168.23.0/24 is directly connected, Serial0.32
>
>   Debug igrp transactions shows R3 receiving news about 10.0.0.0 network,
>   but the route is not installed on the routing table via IGRP;  as IGRP
>   has a better administrative cost than redistributed routes via EIGRP, I
>   would expect the IGRP route to be the routing table.
>
>   R3#debu ip igrp transactions
>   IGRP protocol debugging is on
>   IP routing:
>     IGRP protocol debugging is on
>
>   00:24:24: IGRP: sending update to 255.255.255.255 via Serial0.32
>   (192.168.23.2) - suppressing null update
>   00:24:56: IGRP: received update from 192.168.23.1 on Serial0.32
>   00:24:56:       network 192.168.12.0, metric 10476 (neighbor 8476)
>   00:24:56:       network 10.0.0.0, metric 10976 (neighbor 8976)
>
>
>   R1
>
>   interface Loopback1
>    ip address 10.10.10.10 255.255.255.0
>   !
>   interface Serial0.12 point-to-point
>    ip address 192.168.12.1 255.255.255.0
>    frame-relay interface-dlci 112
>   !
>   router igrp 1
>    network 10.0.0.0
>    network 192.168.12.0
>
>   R2
>
>   interface Loopback0
>    ip address 2.2.2.2 255.255.255.0
>   !
>   interface Serial0.21 point-to-point
>    ip address 192.168.12.2 255.255.255.0
>    no ip directed-broadcast
>    frame-relay interface-dlci 121
>   !
>   interface Serial0.23 point-to-point
>    ip address 192.168.23.1 255.255.255.0
>    no ip directed-broadcast
>    frame-relay interface-dlci 123
>   !
>   router eigrp 1
>    network 192.168.23.0
>   !
>   router igrp 1
>    network 192.168.12.0
>    network 192.168.23.0
>
>   R3
>
>   interface Serial0.32 point-to-point
>    ip address 192.168.23.2 255.255.255.0
>     frame-relay interface-dlci 132
>   !
>   router eigrp 1
>    network 192.168.23.0
>    no eigrp log-neighbor-changes
>   !
>   router igrp 1
>    network 192.168.23.0
>
>   Any Thoughts?




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