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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>I prefer IS-IS over OSPF for below reasons:<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Security<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Modularity<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><span style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Overload Mechanism<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Also, I prefer IS-IS over OSPF because we can design a large networks by building a single large Level 1 (L1) area without any hierarchies in IS-IS and still be able to manage, something that would be difficult with OSPF. There are issues with inter-area traffic engineering and such and most people would like to keep their network as a single area if the routing protocol can manage it.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>There are some restrictions for applications like MPLS TE that require flat area 0 for OSPF or flat level 2 for IS-IS. This also simplifies the design so heirarchy isn't an issue. But maintaining large number of LSA’s in a single area is very difficult for OSPF. So IS-IS is better for MPLS.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#002060'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#002060'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#0000CC'>Regards, </span><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:#0070C0'>Farid</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#002060'><o:p></o:p></span></p><p class=MsoNormal><b><span style='font-size:9.0pt;font-family:"Tahoma","sans-serif";color:red'>Aamra</span></b><span style='font-size:9.0pt;font-family:"Tahoma","sans-serif";color:red'>,</span><i><span style='font-size:8.0pt;font-family:"Tahoma","sans-serif";color:#262626'> the power of WE</span></i><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> nog-bounces@bdnog.org [mailto:nog-bounces@bdnog.org] <b>On Behalf Of </b>Simon Sohel Baroi / IIG-ITC / Sr.Manager / 01678618243 /<br><b>Sent:</b> 18-Nov-2013 12:08 AM<br><b>To:</b> nog@bdnog.org<br><b>Subject:</b> [bdNOG] ISIS of OSPF<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal style='margin-bottom:12.0pt'>Dare All the bdNOG friends,<br><br>Which one is better ISIS or OSPF.<o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>I'm mainly focusing of fast convergence time. My clients can not give me any ping loss in that convergence moment, if one fiber goes down in my MPLS link.<o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>Number of router will be around 600.<o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>Need your help guys.<o:p></o:p></p></div><div><p class=MsoNormal>- SIMON<br>Fiber@Home.<o:p></o:p></p></div><div><div><p class=MsoNormal><br>-- <br><b><span style='font-size:7.5pt;font-family:"Tahoma","sans-serif"'>Simon Sohel Baroi </span></b><span style='font-size:7.5pt;font-family:"Tahoma","sans-serif"'>| Sr. Manager, Technology | PICO | ITC - </span><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>IIG |</span><span style='font-size:7.5pt;font-family:"Tahoma","sans-serif"'><br>Cell : +880-1678-618243, +880-181-7022207 | Desk : +880-9666776677 Ext-1031 | </span><o:p></o:p></p><div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:7.5pt;font-family:"Tahoma","sans-serif"'>Mail : <a href="mailto:simon.baroi@fiberathome.net" target="_blank">simon.baroi@pico.net.bd</a> | Skype : tx.fttx |<span style='color:#006600'><o:p></o:p></span></span></p><div><div><p class=MsoNormal><b><i><span style='font-size:7.5pt;font-family:"Tahoma","sans-serif";color:#006600'>Reduce. Reuse. Recycle. Respect. It's the little things that really can make a difference.</span></i></b><span style='font-size:7.5pt;font-family:"Tahoma","sans-serif";color:#006600'><o:p></o:p></span></p></div></div></div></div></div></div></div></body></html>