Tag match and set , redistributing routing loop prevention

From: zillah (forwardtruth@yahoo.com)
Date: Mon Jun 26 2006 - 02:16:24 ART

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I have not see in all redistribution tasks they have used the below configuration format to deny routing loop : ?

Lab 7 V3 Task 4.9
R1:
router ospf 1
redistribute rip subnets route-map RIP_TO_OSPF
!
router rip
redistribute connected metric 1
redistribute ospf 1 metric 1 route-map OSPF_TO_RIP
!
route-map OSPF_TO_RIP deny 10
match tag 120
!
route-map OSPF_TO_RIP permit 20
set tag 110
!
route-map RIP_TO_OSPF deny 10
match tag 110
!
route-map RIP_TO_OSPF permit 20
set tag 120

Is there any guideline for using such configuration ?

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