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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal">My Name is Keshava who was talking about using IGP to learn VM prefix and advertise to have reachability within the cloud in the last Atlanta summit.<o:p></o:p></p>
<p class="MsoNormal">Instead of running BGP below are the thoughts to use OSPF routing protocol which support hierarchical network design also.<o:p></o:p></p>
<p class="MsoNormal">Here are my thoughts about the same.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>OSPF will be running in each of the Nodes under that TOR/switch for a particular Area.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Tennant VM prefix needs to added as static route <o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Each of the Nodes will form adjacency with each other in that area.
<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style="mso-list:Ignore">a.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>If it is broadcast network then of the OSPF router will become ‘Designated router/DR’ on behalf all others in that area .<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">4.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>L-1 switch/Nodes acting as Area-border router ( ABR) will connect to L2-switch which is Area-0.<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in">This will help for <o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in;text-indent:.5in">Route-aggregation,
<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in;text-indent:.5in">Avoid flooding of routes if any Node is going down.<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in;text-indent:.5in">If any of the Node/Router is of higher/low capacity it is possible to say ‘forwarding option to other router’ for egress traffic.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Let us know peoples opinion about the same.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks & regards,<o:p></o:p></p>
<p class="MsoNormal">Keshava.A<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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