From: James Keane (jameskeane@yahoo.com)
Date: Tue Aug 09 2005 - 10:47:18 GMT-3
regarding ISIS, remeber your HEX so area 47 is 2F etc
regarding loops ...
the way I understand it, you only need to stop a loop
in one place, so if you tag it on one 'crossroads' you
can enforce it on the other. so your example
R1---------R2-------------R4
| OSPF EIGRP |
|-----------R3-------------|
We shall TAG on R2 in the redistribution so
router eigrp
redistribute ospf metric 1000 .(etc).. route-map O2E
route-map O2E permit 10
set tag 10
router ospf 1
redistribute eigrp subnets route-map E2O
route-map E2O permit 10
set tag 20
on R3 we shall prevent feedback
we need to redistribute from O2E and PREVENT the eigrp
(now ospf externals) coming in, luckily we have taged
them with 20.
so we
route-map O2E deny 10
match tag 20
route-map O2E permit 20
like wise on R3 we need to prevent the feedback the
other way, so the ospf routes (now external EIGRP with
10) need to be filtered
so
route-map E2O deny 10
match tag 10
route-map E2O permit 20
2: Tips, using the protocols admin distances like you
did is bound to lead to to confuse tags with admin
distances, think of tagging like colouring .. it does
nothing by itself, but we can use the colours to help
identifiy the source of a route.
Hope it helps !
James
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