Re: [cisco-ttl] Distance

From: Ilker Temir (itemir_at_cisco.com)
Date: Wed Feb 18 2004 - 04:35:05 GMT

  • Next message: Ilker Temir: "Re: [cisco-ttl] Distance"

    Bu guzel bir soru, yaniti tam vermeden gecmeyelim ;-)

    Asagidaki topoloji icin

                    256kbps____ Router-B ---|
                          / |
                         / | 172.16.1.0/24
    Router-X----Router-A |-----
                         \ |
                   128kbps\____ Router-C ---|

    Router-A'nin 172.16.1.0 agi icin Router-B ve Router-C uzerinden iki
    yolu mevcut.

    Router-B ve Router-C 172.16.1.0 'a dogrudan bagli durumdalar ve ikisi
    de bu aga ulasim icin ayni metric degerine sahipler.

    Router-A uzerinden bakildiginda, Router-B ve Router-C'nin 172.16.1.0 agi
    icin hesaplayip Router-A'ya gonderdigi metric degerleri "Reported
    Distance (RD)", Router-A'nin 172.16.1.0 agina Router-B uzerinden ulasmak
    icin sectigi ise "Feasible Distance (FD)" olur. (Router-A ve Router-B
    arasindaki hat daha hizli oldugu icin bu yol tercih edilir).

    Router-A uzerinde 172.16.1.0 icin "Feasible Successor" ise, "Reported
    Distance" < "Feasible Distance" sartini saglayan Router-C olur.

    "Feasible Successor", "Feasible Distance" ile ulasilan yol (best path)
    ulasilamaz hale gelirse kullanilacak olan alternatif yoldur.

    Son olarak Router-A, Router-X'e "Feasible Distance" olarak sectigi
    metrigi anons edecektir. Bu, Router-X uzerinden bakildiginda,
    Router-A'nin "Reported Distance"i olur.

    Ilker

    Emre BALCI wrote:
    > Merhabalar..
    > Feasible Distance, Reported Distance ve Feasible
    > Successor kavramlarını biraz acıklayabilir misiniz ben
    > karıştırdım biraz ..... :(
    >
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