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redistribution approach in case of OSPF and EIGRP externals
I have been using IE labs and most of the times I have seen similar approach for dealing with redistribution problems arising due to redistributing EIGRP external routes in OSPF at two points.
Their solution on most of the ocassions follow changing ospf external distance to 171 so that eigrp external is preferred and then changing ospf external prefixes AD(which is 171 now) to revert back to 110 using access lists.
According to me a more simpler approach could be to just change the ospf distance directly for EIGRP external routes to 171 so that routers where we are doing redistribution prefers EIGRP external (170) over ospf.
Why would we do this an introduce an extra configuration step?
1: Change ospf external to 171 so that say R1 and R2 prefer EIGRP for eigrp externals. 2: Change original ospf external AD back to 110.
Instead of this
Just change ospf distance original EIGRP external prefixes to 171. distance ospf 171 0.0.0.0 255.255.255.255 ACL so that R1 and R2 prefer EIGRP for EIGRP external routes ans ospf for original ospf external routes.
I know there could be multiple solutions to such problem but I just want to make sure that I am not missing any possible problem arising because of using second solution.
Any suggestions ?
Thanks, Mac
