IS-IS vs OSPF with MPLS

[j.vanrooyen]

Can anybody supply me with links to good info as to the reason for running IS-IS as opposed to OSPF with MPLS ?

We are going to design an ISP type network with MPLS and being a large network I would like to design it to be very scalable thus the question.

Thank You

[DALE FRANCIS]

If its scalability then head for IS-IS, also IS-IS has had all the later TLV's added in by Cisco before OSPF did.

This might give you a hint..

http://www.cisco.com/en/US/tech/tk365/tk381/technologies_tech_note09186a0080093f39.shtml

Cheers China..:)

[DALE FRANCIS · Accepted solution]

Hi,

I came across this conversation in this forum which i am sure will help you and swing you towards ISIS for technical reasons

http://forum.cisco.com/eforum/servlet/NetProf?page=netprof&CommCmd=MB%3Fcmd%3Ddisplay_location%26location%3D.ee93ff9

Adios

[j.vanrooyen]

Thx , I subscribed to the conversation and it has already given me answers to a lot of my questions. As well as your post with the link to the route leaking stuff :)

[andreszurita8]

Hi all,

It seems that link above is not woking anymore, could anyone please share a valid response again. Thanks!

AZ-

[Elvin Arias Soto]

Hi,

Many resources appear regarding this topic, IS-IS vs. OSPF. Providers in general choose IS-IS, among many reasons, due flexibility on running flat large-scale topologies traditionally. Another reason is security, launching an attack from a remote location directed to IS-IS is rather difficult (not impossible, though), since it is directly encapsulated into L2 versus OSPF which is encapsulated in the IP header.

If you have any further questions, do not hesitate to ask further.

Elvin

[andreszurita8]

Thanks for your reply Elvin! I am trying to reunite arguments to present a network project, to implement IS-IS instead of OSPF as IGP in our ISP network, so any document or blog post can ve very helpful.

Andrés

[Elvin Arias Soto]

1. Deployment simplicity.
2. Simpler IPv6 transition.
3. Security.

Some links I found:

https://nsrc.org/workshops/2016/nsrc-geant-asren-bgp/raw-attachment/wiki/Agenda/08-ISIS-vs-OSPF.pdf
https://routingfreak.wordpress.com/2011/03/05/why-providers-still-prefer-is-is-over-ospf-when-designing-large-flat-topologies/
https://view.officeapps.live.com/op/view.aspx?src=http://www.ws.afnog.org/afnog2013/sie/231-isis/is-is-ospf.ppt

Hope that helps,

Elvin

[BannerMOTD]

Great response!