From: Wang, Ting \(Taylor\) (wangting@avaya.com)
Date: Thu May 04 2006 - 04:14:52 ART
Hi Group,
I found some interesting stuff during practicing the dual point
redistribution between eigrp and OSPF.
The solution for the dual redistribution between eigrp and OSPF Lab 3
is as following, but I find it can't solve all the problem of route
loop.
R1 & R2
router ospf 1
redistribute eigrp 100 subnets route-map EIGRP2OSPF
distance ospf external 171
In case there is external route redistributed from other routing
protocol for both OSPF and EIGRP domain, the problem will appear. To
change the distance of OSPF external higher than EIGRP EX will prevent
the EIGRP EX route redistribute back to
EIGRP domain, but two result will happen for the external Route in OSPF
domain.
1) One of the R1 and R2 will select the sub-optimal route, via EIGRP
instead of OSPF to these OSPF external route.
2) These route will be redistributed back to OSPF domain, even it is
only in the OSPF database.
The solution in Lab 15 only do filter for OSPF to EIGRP and EIGRP to
OSPF to prevent route loop, but I 'm thinking the solution also have
some limitation. The EIGRP EX routes will be override by OSPF in one of
the OSPF ASBR, because OSPF external distance win. That may also cause
the sub-optimal route.
The summary:
1) The solution in Lab3 solve the route loop of the EIGRP external
route, but the route loop may happen on ospf type 5 route. The
sub-optimal route may happen.
2) The solution in Lab 15 will cause the sub-optimal route for EIGRP EX
route. Route loop may still happen if the filter on apply on one ASBR.
My idea is to combine the solution of Lab 3 and Lab 15.
Anyone have some idea on that?
Thanks,
Taylor
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