<div dir="ltr"><div><div><div><div>Dear Mitul Vai,<br><br></div>Thanks for the details information.<br><br>We couldn't make TE-FRR, as so many tunnels to be made from each node.<br><br></div>Some people told us to use RSVP to each hand of the last mile nodes. Does it help me ?<br>
</div>Or it will create another large problem ?<br><br><br></div><div>We have used BFD. Now running it. But we need more faster convergence. <br></div><div><br>< some times I think SDH is better and more simpler......8-) ><br>
</div><div><br></div>- with regards<br><br>SIMON<br><div><div><br><br><div><br></div></div></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Nov 18, 2013 at 9:51 AM, Mehadi Hasan Mitul <span dir="ltr"><<a href="mailto:mmitul@banglalinkgsm.com" target="_blank">mmitul@banglalinkgsm.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div link="blue" vlink="purple" lang="EN-US">
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<p class="MsoNormal" style="line-height:150%"><span style="line-height:150%;font-size:10.0pt;font-family:"Helvetica Neue","sans-serif"">My opinion is same as of Roman vai.<u></u><u></u></span></p>
<p class="MsoNormal" style="line-height:150%"><span style="line-height:150%;font-size:10.0pt;font-family:"Helvetica Neue","sans-serif"">Moving to the main topic of Simon vai, where the concentration is to fast convergence in large MPLS network.
I think it can be achieved in the following ways: -<u></u><u></u></span></p>
<p class="MsoNormal" style="line-height:150%"><b><span style="line-height:150%;font-size:10.0pt;font-family:"Helvetica Neue","sans-serif"">�Enable the MPLS applications for example: MPLS VPN, TE-FRR & MPLS Based QoS�.<u></u><u></u></span></b></p>
<p style="line-height:150%">
<u></u><span style="line-height:150%;font-size:10.0pt;font-family:"Helvetica Neue","sans-serif""><span>a.<span style="font:7.0pt "Times New Roman"">����
</span></span></span><u></u><span style="line-height:150%;font-size:10.0pt;font-family:"Helvetica Neue","sans-serif"">In MPLS VPN based network; OSPF will only manage the L3 uplinks between PE-P & P-P. Therefore the size of routing table will
remain minimum. Use MP-iBGP to share the VPNv4 prefixes between PEs.<u></u><u></u></span></p>
<p style="line-height:150%">
<u></u><span style="line-height:150%;font-size:10.0pt;font-family:"Helvetica Neue","sans-serif""><span>b.<span style="font:7.0pt "Times New Roman"">���
</span></span></span><u></u><span style="line-height:150%;font-size:10.0pt;font-family:"Helvetica Neue","sans-serif"">Enable TE-FRR between P-P and PE-P; which will ensure the convergence in <50ms.<u></u><u></u></span></p>
<p style="line-height:150%">
<u></u><span style="line-height:150%;font-size:10.0pt;font-family:"Helvetica Neue","sans-serif""><span>c.<span style="font:7.0pt "Times New Roman"">����
</span></span></span><u></u><span style="line-height:150%;font-size:10.0pt;font-family:"Helvetica Neue","sans-serif"">Enable MPLS based QoS and assign traffic priority to required customer VPN only.<u></u><u></u></span></p>
<p><u></u><span style="font-size:10.0pt;font-family:"Helvetica Neue","sans-serif""><span>d.<span style="font:7.0pt "Times New Roman"">���
</span></span></span><u></u><span style="font-size:10.0pt;font-family:"Helvetica Neue","sans-serif"">Also vendor specific VPN-FRR technology can be used with the aid of BFD. This technology offers convergence between PE-PE in <200ms.<u></u><u></u></span></p>
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<p class="MsoNormal" style="line-height:150%"><span style="line-height:150%;font-size:9.0pt;font-family:"Helvetica Neue","sans-serif""><u></u>�<u></u></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Helvetica Neue","sans-serif"">Sincerely,<u></u><u></u></span></p>
<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Helvetica Neue","sans-serif"">Mehadi</span></b><span style="font-size:8.0pt;font-family:"Helvetica Neue","sans-serif""> Hasan Mitul<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Helvetica Neue","sans-serif"">PS Core & MPBN Planning Team Leader</span><span style="font-family:"Helvetica Neue","sans-serif""><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Helvetica Neue","sans-serif"">banglalink</span><sup><span style="font-size:7.0pt;font-family:"Helvetica Neue","sans-serif"">TM</span></sup><sup><span style="font-size:8.0pt;font-family:"Helvetica Neue","sans-serif""><u></u><u></u></span></sup></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Helvetica Neue","sans-serif"">Cell: <a href="tel:%2B880%2019161%2000368" value="+8801916100368" target="_blank">+880 19161 00368</a><u></u><u></u></span></p>
</div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica Neue","sans-serif""><u></u>�<u></u></span></p>
<div>
<div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in">
<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""> <a href="mailto:nog-bounces@bdnog.org" target="_blank">nog-bounces@bdnog.org</a> [mailto:<a href="mailto:nog-bounces@bdnog.org" target="_blank">nog-bounces@bdnog.org</a>]
<b>On Behalf Of </b>Nurul Islam<br>
<b>Sent:</b> 18 November, 2013 8:35 AM<br>
<b>To:</b> Md. Faridul Alam | Aamra; 'Simon Sohel Baroi / IIG-ITC / Sr.Manager / <a href="tel:01678618243" value="+8801678618243" target="_blank">01678618243</a> /'; <a href="mailto:nog@bdnog.org" target="_blank">nog@bdnog.org</a></span></p>
<div><div class="h5"><br>
<b>Subject:</b> Re: [bdNOG] ISIS of OSPF<u></u><u></u></div></div><p></p>
</div>
</div><div><div class="h5">
<p class="MsoNormal"><u></u>�<u></u></p>
<div>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif"">With regards to IGP convergence issues I believe there is no big difference between OSPF and IS-IS if I am not wrong. My 1+ for IS-IS if you have multiple routed
protocol I.e. IPv4 and IPv6 etc.�<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif""><u></u>�<u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif"">In SP network convergence issues are mostly handled in design level I.e. de-coupling IGP and EGP. I.e Only loopback and p2p link in OSPF/ISIS. So if there is
any topology change in IGP, packet loss probability is very very less.�<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif""><u></u>�<u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif"">For external prefixes like downstream customer and upstream Internet, people mostly use eBGP. Across the infrastructure iBGP. Convergence time is an issue here
specially if you have full BGP feed from multiple upstream. Try using vendor specific tools like BFD, BGP scanner etc. Or full BGP feed from single upstream and default from other etc. What else? :)<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif""><u></u>�<u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif"">Regards<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif""><u></u>�<u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif"">Roman �<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif"">� �<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif""><u></u>�<u></u></span></p>
</div>
<div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:
</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">"Md. Faridul Alam | Aamra" <<a href="mailto:faridul.alam@aamra.com.bd" target="_blank">faridul.alam@aamra.com.bd</a>><br>
<b>Date: </b>Monday, 18 November 2013 5:49 AM<br>
<b>To: </b>"'Simon Sohel Baroi / IIG-ITC / Sr.Manager / <a href="tel:01678618243" value="+8801678618243" target="_blank">01678618243</a> /'" <<a href="mailto:simon.baroi@fiberathome.net" target="_blank">simon.baroi@fiberathome.net</a>>, "<a href="mailto:nog@bdnog.org" target="_blank">nog@bdnog.org</a>" <<a href="mailto:nog@bdnog.org" target="_blank">nog@bdnog.org</a>><br>
<b>Subject: </b>Re: [bdNOG] ISIS of OSPF<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif""><u></u>�<u></u></span></p>
</div>
<div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">I prefer IS-IS over OSPF for below reasons:</span><span style><u></u><u></u></span></p>
<p><u></u><span style><span>1.<span style="font:7.0pt "Times New Roman"">�����
</span></span></span><u></u><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Security</span><span style><u></u><u></u></span></p>
<p><u></u><span style><span>2.<span style="font:7.0pt "Times New Roman"">�����
</span></span></span><u></u><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Modularity</span><span style><u></u><u></u></span></p>
<p><u></u><span style><span>3.<span style="font:7.0pt "Times New Roman"">�����
</span></span></span><u></u><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Overload Mechanism</span><span style><u></u><u></u></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.</span><span style><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">�</span><span style><u></u><u></u></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.</span><span style><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#002060">�</span><span style><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#002060">�</span><span style><u></u><u></u></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><u></u><u></u></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><u></u><u></u></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"">
<a href="mailto:nog-bounces@bdnog.org" target="_blank">nog-bounces@bdnog.org</a> [<a href="mailto:nog-bounces@bdnog.org" target="_blank">mailto:nog-bounces@bdnog.org</a>]
<b>On Behalf Of </b>Simon Sohel Baroi / IIG-ITC / Sr.Manager / <a href="tel:01678618243" value="+8801678618243" target="_blank">01678618243</a> /<br>
<b>Sent:</b> 18-Nov-2013 12:08 AM<br>
<b>To:</b> <a href="mailto:nog@bdnog.org" target="_blank">nog@bdnog.org</a><br>
<b>Subject:</b> [bdNOG] ISIS of OSPF</span><span style><u></u><u></u></span></p>
<p class="MsoNormal"><span style>�<u></u><u></u></span></p>
<div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style>Dare All the bdNOG friends,<br>
<br>
Which one is better ISIS or OSPF.<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style>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.<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style>Number of router will be around 600.<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style>Need your help guys.<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style>- SIMON<br>
Fiber@Home.<u></u><u></u></span></p>
</div>
<div>
<div>
<p class="MsoNormal"><span style><br>
-- <br>
</span><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 : <a href="tel:%2B880-1678-618243" value="+8801678618243" target="_blank">+880-1678-618243</a>, <a href="tel:%2B880-181-7022207" value="+8801817022207" target="_blank">+880-181-7022207</a> �|� Desk : <a href="tel:%2B880-9666776677%20Ext-1031" value="+8809666776677" target="_blank">+880-9666776677 Ext-1031</a>� |��</span><span style><u></u><u></u></span></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><span style><u></u><u></u></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><u></u><u></u></span></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div></div></div>
</div>
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<br></blockquote></div><br><br clear="all"><br>-- <br><font style="font-family:tahoma,sans-serif" size="1"><b>Simon Sohel Baroi� </b>| �Sr. Manager, Technology� |� </font><font style="font-family:tahoma,sans-serif" size="1">PICO� |�� ITC - </font><span style="font-family:tahoma,sans-serif;font-size:x-small">IIG �|</span><font style="font-family:tahoma,sans-serif" size="1"><br>
</font><font style="font-family:tahoma,sans-serif" size="1">Cell : +880-1678-618243, +880-181-7022207 �|� Desk : +880-9666776677 Ext-1031� |��</font><div><font style="font-family:tahoma,sans-serif" size="1">Mail : <a href="mailto:simon.baroi@fiberathome.net" target="_blank">simon.baroi@pico.net.bd</a>� |� Skype : tx.fttx� |<br>
<br></font><font style="color:rgb(0,102,0)" size="1"><i><b><font face="Helvetica"><span style="font-family:Tahoma;font-style:normal;font-weight:normal"><div>
<div style="margin-top:0px;margin-bottom:0px"><b><i>R</i></b><b><i>educe. Reuse. Recycle. Respect. It's the little things that really can make a difference.<br></i></b></div>
</div></span></font></b></i></font></div>
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