[j-nsp] Segment Routing ( SPRING )

[Aaron]

Hi James, I have the book "MPLS in the SDN Era" and it shows some SPRING/SR
config for Junos and IOS XR on Page 94

One of the key contributors to the book is cc'd here... David might be able
to speak to some of the SPRING existence in Junos

I'm seeing this in my lab ASR9k running XR 5.3.1

RP/0/RSP0/CPU0:eng-lab-9k-1#conf
Thu Apr  7 13:37:18.241 CDT
RP/0/RSP0/CPU0:eng-lab-9k-1(config)#router isis mycore
RP/0/RSP0/CPU0:eng-lab-9k-1(config-isis)#address-family ipv4 unicast
RP/0/RSP0/CPU0:eng-lab-9k-1(config-isis-af)#segment-routing ?
  mpls            Enable Segment Routing Feature using MPLS encapsulation
  prefix-sid-map  Enable prefix-sid-map
RP/0/RSP0/CPU0:eng-lab-9k-1(config-isis-af)#segment-routing mpls ?
  sr-prefer  Prefer segment routing labels over LDP labels
  <cr>
RP/0/RSP0/CPU0:eng-lab-9k-1(config-isis-af)#segment-routing mpls sr-prefer ?
  <cr>
RP/0/RSP0/CPU0:eng-lab-9k-1(config-isis-af)#segment-routing prefix-sid-map ?
  advertise-local  Advertise active local prefix-SID mappings
  receive          Enable prefix-SID mapping client
RP/0/RSP0/CPU0:eng-lab-9k-1(config-isis-af)#segment-routing prefix-sid-map
advertise-local ?
  <cr>
RP/0/RSP0/CPU0:eng-lab-9k-1(config-isis-af)#segment-routing prefix-sid-map
receive ?
  <cr>
RP/0/RSP0/CPU0:eng-lab-9k-1(config-isis-af)#exit
RP/0/RSP0/CPU0:eng-lab-9k-1(config-isis)#exit
RP/0/RSP0/CPU0:eng-lab-9k-1(config)#exit
Uncommitted changes found, commit them before exiting(yes/no/cancel)?
[cancel]:no
RP/0/RSP0/CPU0:eng-lab-9k-1#

Aaron


-----Original Message-----
From: juniper-nsp [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of
James Bensley
Sent: Wednesday, April 6, 2016 2:47 PM
To: juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] Segment Routing ( SPRING )

On 5 March 2016 at 15:17, Jesper Skriver <jesper at skriver.dk> wrote:
>
>> On 05 Mar 2016, at 16:41, Saku Ytti <saku at ytti.fi> wrote:
>>
>> On 5 March 2016 at 15:22, Adam Vitkovsky <Adam.Vitkovsky at gamma.co.uk>
wrote:
>>>> (b) Are there any noticeable behavioral differences between SPRING 
>>>> and LDP implementations?
>>>>
>>> Yes instead of label swap routers do label pop

SR can also use IPv6 and build stacks of IPv6 headers so not just MPLS label
stacks (a-la service chaining).

Also this is working more or less in IOS-XR (ASR9000). I've build a basic
working topology on Cisco VIRL and it worked. Haven't any "proper" testing
though as I've had no time of late.

I don't know any Juniper kit that's running SR at present.

James.
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