From: Victor Cappuccio (cvictor@protokolgroup.com)
Date: Sat Oct 01 2005 - 14:54:00 GMT-3
This is From a eBook I have:
There are two methods of redistributing between IGRP and EIGRP,
depending on whether or not the two routing domains have the same AS
number. The following diagram illustrates automatic redistribution
between IGRP and EIGRP. Note that both routing domains are using the
same AS number of 90:
Redistribution will occur automatically with no additional configuration
commands required. Metrics between the two routing domains are preserved
since IGRP and EIGRP make use of the same composite metric, albeit EIGRP
multiplies the metric by 256. No automatic summarization takes place.
The following output from Router D highlights automatic redistribution.
Please take particular note of the AD of the routes and also the fact
that automatic summarization does not occur.
RouterD>*show 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, IA - IS-IS INTER AREA
* - CANDIDATE DEFAULT, U - PER-USER STATIC ROUTE, O - ODR
P - PERIODIC DOWNLOADED STATIC ROUTE
GATEWAY OF LAST RESORT IS NOT SET
172.16.0.0/16 IS SUBNETTED, 3 SUBNETS
D EX 172.16.0.0 [170/5514496] VIA 10.1.16.1, 00:01:48, SERIAL0/0
D EX 172.16.1.0 [170/6026496] VIA 10.1.16.1, 00:01:20, SERIAL0/0
10.0.0.0/8 IS SUBNETTED, 1 SUBNETS
C 10.1.16.0 IS DIRECTLY CONNECTED, SERIAL0/0
The second method of redistributing between IGRP and EIGRP is used when
the two routing domains have different AS numbers. It is called manual
redistribution, as it requires additional configuration. Note that in
the following diagram the AS number in the IGRP domain is 100 and in the
EIGRP domain it is 90:
*Metrics are preserved when redistributing between IGRP and EIGRP*. The
following configuration is all that is required on Router C to enable
manual redistribution
router eigrp 90
redistribute igrp 100
network 10.0.0.0
!
router igrp 100
redistribute eigrp 90 network 172.16.0.0
HTH
Victor
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