Subject: [OSPF] a question of the procedure of ospf convergence

From: <[email-masked]>
Date: Wed, 19 Jul 2006 09:18:21 +0800 (CST)

<p>        B------C\<p>      / |      | \<p>    /   |      |   \<p>  A     |      |    \D<p>  \     |      |    /  <p>    \   |      |  /<p>     \ F ------E/<p><p>In the topology ,every edge represent tow links with different weights when link between E-D fails(D-E not fail)<p>the convergence procedure as follows:<p><p>OSPF LISF <p>Time      Events  <p>step 1 0s Failure of link E-D A-F-E-drop <p>step 2 0.05s D,E: failure detected A-F-E-drop <p>step 3 0.15s C,F: failure notified A-F-E-drop <p>step 4 0.25s A,B: failure notified A-F-E-drop <p>step 5 0.35s B: route update A-F-E-drop <p>step 6 0.45s D,E: route update A-F-E-F-...(loop) <p>step 7 0.55s C,F: route update A-F-B-C-D <p>step 8 0.65s A: route update A-B-C-D<p><p>I can not understant step 5->step 8 ,why B first update? A last?<p>Thanks for answering <p>Yours sincerely<p>

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