[c-nsp] SR-TE

[dip]

Yeah, there are certainly few ways to configure SR-TE. In your example,
How's R10 learning R20 Prefixes? I am assuming that's BGP between PE-CE's
(Is it L3VPN's ??) and PE's are doing next-hop-self. So the R30 prefix is
learned via BGP at R20 with R22 as the next-hop making. You have a tunnel
from R20--> R22 (inferring based on the loopback IP).

I don't have access to a box to check what cli options are available or not
but you can try few things
1) Static route mapping to the destination. Page 59
2) see if there is an auto-route announce option available under policy for
IGP to use the routes via the tunnel destination.

Take a look at this config guide which seems relatively more comprehensive
https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k-r6-6/segment-routing/configuration/guide/b-segment-routing-cg-asr9000-66x/b-segment-routing-cg-asr9000-66x_chapter_01000.pdf

Page5:
https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k-r6-2/segment-routing/configuration/guide/b-segment-routing-cg-asr9000-62x/b-seg-routing-cg-asr9000-62x_chapter_01000.pdf


Thanks
Dip

On Fri, Sep 18, 2020 at 8:59 AM <aaron1 at gvtc.com> wrote:

> Thanks dip, but a bit confused at this point since I thought SRTE didn’t
> need tunnel interface at the Head End LSR, and that a policy was what
> steered traffic into an SRTE Path.
>
>
>
> But, I do see some web sites that mention it both ways… using tunnel
> interface or using an sr-te policy… So I don’t know why they difference.
> Is it that some version of XR did it with only a tunnel interface and other
> versions of XR did it with policy?  (heck I even see some that show a
> static route calling a explicit path option! IOS-XE website)
>
>
>
> https://www.lacnic.net/innovaportal/file/4016/1/sr_srte_pce-hands-on.pdf
>
>
>
> slide number 28 shows SR-TE policy
>
>
>
>
> https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/segment-routing/configuration/guide/b-seg-routing-cg-asr9k/b-seg-routing-cg-asr9k_chapter_0100.html
>
>
>
> shows sr-te on tunnel interface
>
>
>
> I was trying on XR 6.3.1 XRv using OSPF as IGP
>
>
>
> I have a different virtual lab environment where I have XR 7.0.2 XRv9k and
> I am going to try it there with IS-IS as IGP
>
>
>
> I’ll take any advice from anyone that has info on this.
>
>
>
> -Aaron
>