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Thread: H2+ avoid Loop between R9,R10,R53,R54

  1. #1

    H2+ avoid Loop between R9,R10,R53,R54

    i want to share how i made loop avoidance in H2+

    create a route-map to distribute tag 172.172.172.172 in eigrp:

    route-map TAG permit 10
    ste tag 172.172.172.172
    exit

    router eigrp AS65006
    add-famil ipv4 as 10
    topology base
    distribute-list route-map TAG out
    end

    on R9 and R10
    do:
    route-map DENY-TAG deny 10
    match tag 172.172.172.172
    exit
    route-map DENY-TAG permit 20
    set metric 10000 100 1 255 1500
    exit
    route-map DENY-TAG permit 30
    exit


    router eigrp AS65006
    add-famil ipv4 as 10
    topology base
    redistribute ospf 1 route-map DENY-TAG
    exit

    router ospf 1
    redistribute eigrp 10 subnets


    It works fine for me
    Try it...

  2. The Following User Says Thank You to olivereng20 For This Useful Post:

    firas81 (08-21-2019)

  3. #2

    Re: H2+ avoid Loop between R9,R10,R53,R54

    Hi,

    it works, but i think this is not a perfect solution to do it, but why do you have three entry in your map??? and why do you use it from ospf into eigrp????

    the idea here to block the exteranl eigrp prefixes in ospf domain, because the transition from higher AD to lower AD makes the routers border ospf R9/10 choose it, and then we get the loop.


    I think the solution by using your map with a littel bitte updating will be on R9/10 as the next:

    route-map DENY-TAG deny 10
    match tag 172.172.172.172
    route-map DENY-TAG permit 20

    router ospf 1
    distribute-list route-map DENY-TAG in

    Only this, it is simple and perfect.

    and with using the Ad in H2+ will be:

    router os 1
    distance ospf external 175 ------> a little bit higher than external eigrp 170

    All the best.

  4. #3

    Re: H2+ avoid Loop between R9,R10,R53,R54

    Quote Originally Posted by firas81 View Post
    Hi,

    it works, but i think this is not a perfect solution to do it, but why do you have three entry in your map??? and why do you use it from ospf into eigrp????

    the idea here to block the exteranl eigrp prefixes in ospf domain, because the transition from higher AD to lower AD makes the routers border ospf R9/10 choose it, and then we get the loop.


    I think the solution by using your map with a littel bitte updating will be on R9/10 as the next:

    route-map DENY-TAG deny 10
    match tag 172.172.172.172
    route-map DENY-TAG permit 20

    router ospf 1
    distribute-list route-map DENY-TAG in

    Only this, it is simple and perfect.

    and with using the Ad in H2+ will be:

    router os 1
    distance ospf external 175 ------> a little bit higher than external eigrp 170

    All the best.
    Hi Thank you for your explanation. Your Solution works fine for me too! Many thanks for share

  5. #4

    Re: H2+ avoid Loop between R9,R10,R53,R54

    Thank you for your sharing!!

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