[j-nsp] Segment Routing ( SPRING )

[Aaron Gould]

Hi all, any guidance for doing the sr-to-ldp mapping thing would be appreciated…

 

I tried to do the mapping server between spring (sr) and ldp but was unable to get it working.  I configured the mapping server, and the client according to “Day One Segment Routing” doc and the other link below

 

I’m trying to make it work in my OSPF igp

 

Some of the docs only tell you how to do it in ISIS, but then tell you it’s possibly in OSPF, and may or may not tell you how.

 

One of the docs (I think Day One SR) tells you an isis ldp-stitching command is required but I don’t know how to do that in ospf or if it’s even required

 

One of the docs says to set srgb (sr global block) in isis, but again, I’m using ospf and don’t know how to do that or if it’s required or automagic

 

https://www.juniper.net/documentation/en_US/junos/topics/concept/ldp-mapping-server-using-ospf-isis-overview.html

 

https://www.juniper.net/uk/en/training/jnbooks/day-one/configuring-segment-routing-junos/index.page

 

- Aaron

 

 

From: dip [mailto:diptanshu.singh at gmail.com] 
Sent: Friday, March 4, 2016 2:54 PM
To: Aaron
Cc: Clarke Morledge; juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] Segment Routing ( SPRING )

 

SPRING uses IGP to piggyback label information ( things like SRGB, Prefix-SID) which could be IS-IS or OSPF. 

 

IS-IS : https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-06

OSPF: https://tools.ietf.org/html/draft-psenak-ospf-segment-routing-extensions-05

 

And in certain cases(like MSDC) BGP could be used as well ( BGP Prefix-SID Attribute)

 

https://www.ietf.org/archive/id/draft-keyupate-idr-bgp-prefix-sid-05.txt

 

On Fri, Mar 4, 2016 at 2:33 PM, Aaron <aaron1 at gvtc.com> wrote:

I don't have answers for you Clarke, hopefully others out there will...

But, I do have a question...  Does SPRING require an IGP ?  And if so, is
ISIS the only IGP that SPRING will/can use?

Aaron

-----Original Message-----
From: juniper-nsp [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of
Clarke Morledge
Sent: Friday, March 4, 2016 12:49 PM
To: juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] Segment Routing ( SPRING )

I am working my way through _MPLS in the SDN Era_, and I really am intrigued
by what I read about SPRING.

I got burned a few years ago trying to deploy RSVP for traffic engineering
purposes, and I ran into so many serious JUNOS bugs, I had to abandon it and
use LDP to handle labels and stick with IGP metric manipulation to do some
basic traffic enginering.  Since I do not need bandwith reservation, I have
actually appreciated the simplicity of LDP.  But it looks like SPRING does
pretty much the same thing, with less control plane overhead, which is even
more attractive.

I have a few questions for those who might know:

(a) How mature is SPRING, considering that the ISIS IGP it is built on is
well-established?

(b) Are there any noticeable behavioral differences between SPRING and LDP
implementations?

(c) Do we have any idea when P2MP LSPs will come along with SPRING? Will it
need to be coupled somehow with PIM?

Thanks.

Clarke Morledge
College of William and Mary
Information Technology - Network Engineering Jones Hall (Room 18)
Williamsburg VA 23187 _______________________________________________
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