SR TE Policy with ISIS not coming up in IOS XR | IOS XE

[Mohideen Pitchai]

Hi , I am trying to validate SR TE policy on 4 nodes where 2 IOS XR and 2 IOS XE based nodes . I am running ISIS across all the nodes ; With SR running, i am unable to bring up the SR-TE Policy with dynamic option. 

Looking forward for further support to move forward.

IOS XE - R2  17.3.1a R2#sh segment-routing traffic-eng policy all Name: SR_TE_R2_TO_R3 (Color: 23 End-point: 3.3.3.3) Owners : CLI Status: Admin: up, Operational: down for 01:17:20 (since 06-28 22:07:33.345) Candidate-paths: Preference 23 (CLI): Dynamic (inactive) Inactive Reason: CSPF no path Metric Type: IGP Attributes: Binding SID: 16 Allocation mode: dynamic State: Programmed

R2#show segment-routing traffic-eng topology ipv4 | b 3.3.3.3 TE router ID: 3.3.3.3 Host name: R3 ISIS system ID: 0000.0000.0003 level-2 domain ID: 62 ASN: 0 Prefix SID: Prefix 3.3.3.3, label 16003 (regular), domain ID 62, flags: N

Thanks

Mohideen.

[Harold Ritter]

Hi Mohideen,

It could be many things.

As this is not a PCE calculated path, did you configure "distribute link-state"?

Can you provide the isis configuration.

Regards,

[Mohideen Pitchai]

Hi @Harold Ritter  

Please find below.. I have similar issue in establishing SR-TE policy on IOS XR as well

R2 IOS XE	XR2 - IOS XR
R2#sh run | s r isis ip router isis SR_NEW ip router isis SR_NEW router isis SR_NEW net 49.0001.0000.0000.0002.00 is-type level-2-only metric-style wide distribute link-state instance-id 62 segment-routing mpls segment-routing prefix-sid-map advertise-local mpls traffic-eng router-id Loopback0 mpls traffic-eng level-2	router isis SR_NEW is-type level-2-only net 49.0001.0000.0000.0012.00 distribute link-state instance-id 212 level 2 throttle 10 address-family ipv4 unicast metric-style wide mpls traffic-eng level-2-only mpls traffic-eng router-id Loopback0 router-id Loopback0 segment-routing mpls ! interface Loopback0 address-family ipv4 unicast prefix-sid index 12

[Harold Ritter]

Hi Mohideen,

Are the ISIS interfaces configured as point-to-point interfaces. You need to configure the ISIS interfaces as such for SRTE to work properly.

For example:

IOS-XE:

interface GigabitEthernet1

isis network point-to-point

XR:

router isis SR_NEW
interface GigabitEthernet0/0/0/0
point-to-point

Regards,