[bdNOG] ISIS of OSPF

Mon Nov 18 21:53:44 BDT 2013

Dear Mitul Vai,

Thanks for the details information.

We couldn't make TE-FRR, as so many tunnels to be made from each node.

Some people told us to use RSVP to each hand of the last mile nodes. Does
it help me ?
Or it will create another large problem ?

We have used BFD. Now running it. But we need more faster convergence.

< some times I think SDH is better and more simpler......8-) >

- with regards

SIMON

On Mon, Nov 18, 2013 at 9:51 AM, Mehadi Hasan Mitul <
mmitul at banglalinkgsm.com> wrote:

>  My opinion is same as of Roman vai.
>
> 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: -
>
> *‘Enable the MPLS applications for example: MPLS VPN, TE-FRR & MPLS Based
> QoS’.*
>
> a.     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.
>
> b.    Enable TE-FRR between P-P and PE-P; which will ensure the
> convergence in <50ms.
>
> c.     Enable MPLS based QoS and assign traffic priority to required
> customer VPN only.
>
> d.    Also vendor specific VPN-FRR technology can be used with the aid of
> BFD. This technology offers convergence between PE-PE in <200ms.
>
>
>
> Sincerely,
>
> *Mehadi* Hasan Mitul
>
> PS Core & MPBN Planning Team Leader
>
> banglalinkTM
>
> Cell: +880 19161 00368
>
>
>
> *From:* nog-bounces at bdnog.org [mailto:nog-bounces at bdnog.org] *On Behalf
> Of *Nurul Islam
> *Sent:* 18 November, 2013 8:35 AM
> *To:* Md. Faridul Alam | Aamra; 'Simon Sohel Baroi / IIG-ITC / Sr.Manager
> / 01678618243 /'; nog at bdnog.org
>
> *Subject:* Re: [bdNOG] ISIS of OSPF
>
>
>
> 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.
>
>
>
> 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.
>
>
>
> 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? :)
>
>
>
> Regards
>
>
>
> Roman
>
>
>
>
>
> *From: *"Md. Faridul Alam | Aamra" <faridul.alam at aamra.com.bd>
> *Date: *Monday, 18 November 2013 5:49 AM
> *To: *"'Simon Sohel Baroi / IIG-ITC / Sr.Manager / 01678618243 /'" <
> simon.baroi at fiberathome.net>, "nog at bdnog.org" <nog at bdnog.org>
> *Subject: *Re: [bdNOG] ISIS of OSPF
>
>
>
> I prefer IS-IS over OSPF for below reasons:
>
> 1.      Security
>
> 2.      Modularity
>
> 3.      Overload Mechanism
>
> 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.
>
>
>
> 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.
>
>
>
>
>
> Regards, Farid
>
> *Aamra*,* the power of WE*
>
> *From:* nog-bounces at bdnog.org [mailto:nog-bounces at bdnog.org<nog-bounces at bdnog.org>]
> *On Behalf Of *Simon Sohel Baroi / IIG-ITC / Sr.Manager / 01678618243 /
> *Sent:* 18-Nov-2013 12:08 AM
> *To:* nog at bdnog.org
> *Subject:* [bdNOG] ISIS of OSPF
>
>
>
> Dare All the bdNOG friends,
>
> Which one is better ISIS or OSPF.
>
> 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.
>
> Number of router will be around 600.
>
> Need your help guys.
>
> - SIMON
> Fiber at Home.
>
>
> --
> *Simon Sohel Baroi  *|  Sr. Manager, Technology  |  PICO  |   ITC - IIG  |
> Cell : +880-1678-618243, +880-181-7022207  |  Desk : +880-9666776677
> Ext-1031  |
>
> Mail : simon.baroi at pico.net.bd <simon.baroi at fiberathome.net>  |  Skype :
> tx.fttx  |
>
> *Reduce. Reuse. Recycle. Respect. It's the little things that really can
> make a difference.*
>
> _______________________________________________
> nog mailing list
> nog at bdnog.org
> http://mailman.bdnog.org/mailman/listinfo/nog
>
>

-- 
*Simon Sohel Baroi  *|  Sr. Manager, Technology  |  PICO  |   ITC - IIG  |
Cell : +880-1678-618243, +880-181-7022207  |  Desk : +880-9666776677
Ext-1031  |
Mail : simon.baroi at pico.net.bd <simon.baroi at fiberathome.net>  |  Skype :
tx.fttx  |

* Reduce. Reuse. Recycle. Respect. It's the little things that really can
make a difference. *
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