Does SR-TE policy have a path protection function?

[Soushi Takata]

Thanks for any insight.

I want to move from RSVP-TE to SR-TE policy.
The RSVP-TE environment uses the path protection function.
I would like to use the path protection feature in the SR-TE policy environment as well.
But I could not find any such feature in the configuration guide or etc.
Is it possible to implement the path protection function in SR-TE policy?

Thanks,

Soushi

[loris.marcellini]

Soushi, 

SR-TE can leverage TI-LFA and Remote TI-LFA. It's easily configurable under ISIS/OSPF. I found the official SR website has most of the info and detailed guide about it. I would also recommend getting the SR I and II books if you want to learn even more.

https://www.segment-routing.net/tutorials/2016-09-27-topology-independent-lfa-ti-lfa/

Cheers, L.

[Soushi Takata]

Ioris,

Thank you for your reply.

I know Segment Routing can use TI-LFA.

And I think TI-LFA is a good feature as Local Repair.

However, what I am looking for is a global repair function.

Because I want to migrate the RSVP-TE configuration directly to SR-TE, if possible.

I remember there was a path-protection command when sr-te was using tunnel interface.

Best Regards,

[loris.marcellini]

interface tunnel-te1
ipv4 unnumbered Loopback0
bfd
fast-detect sbfd
multiplier 3
minimum-interval 50
!
destination 1.1.1.2
path-protection
path-option 10 explicit name PRIMARY segment-routing protected-by 20
path-option 20 explicit name SECONDARY segment-routing protected-by 10

Is this what you are looking for?

[Soushi Takata]

Ioris,

It's this config that I wrote that I remember.

However, this configuration cannot be set in the current IOS-XR.

We can't specify segment-routing in the path-option setting.

Now we need to configure the policy in the segment routing section.

segment-routing
traffic-eng

segment-list LIST1
index 20 mpls label 16004
index 30 mpls label 16002
!

policy 1
color 101 end-point ipv4 1.1.1.2
candidate-paths
preference 50
explicit segment-list LIST1
!

And as far as I know, there's no path-protection setting here.

So I'm looking for a way to configure path-protection.

Best regards,

[loris.marcellini]

Ah.. got it! Yes not sure there's anything like that in SR Auto Steering or
ODN policy.

Let's see if anyone knows more, now I am also curious.

Cheers L