SR TE Policy in IOS XE

[Mohideen Pitchai]

Hi , I am trying to bring up SR TE Policy on VIRL to create a tunnel between PEs.

Need support to clarify the following. Kindly assist.

1. My PCC to PCE connection doesnt show "Instantiation". Is there anything i am missing here as this is required for SR-PCE initiate LSP if i am not wrong.

R5#show pce client peer
PCC's peer database:
--------------------

Peer address: 12.12.12.12, Precedence: 100
Client POLICY_MGR
State up
Capabilities: Stateful, Update, Segment-Routing

2. My Policy is not coming up which is created locally on the PCC R5.

segment-routing mpls
!
connected-prefix-sid-map
address-family ipv4
5.5.5.5/32 index 5 range 1
exit-address-family
!
segment-routing traffic-eng
policy SR_TE_1
color 10 end-point 3.3.3.3
candidate-paths
preference 100
dynamic
metric
type igp
!

Output shows as follows:

R5#sh segment-routing traffic-eng policy all

Name: SR_TE_1 (Color: 10 End-point: 3.3.3.3)
Owners : CLI
Status:
Admin: up, Operational: down for 00:43:04 (since 06-21 09:20:51.275)
Candidate-paths:
Preference 100 (CLI):
Dynamic (inactive)
Inactive Reason: Source address is not specified
Metric Type: IGP
Attributes:

Note : I am running IOS XE 17.3.1a on VIRL 

Thanks
Mohideen.

[Mohideen Pitchai]

Hi Harold,

Thanks once again.. Below is FYKI. I am running on CML2

Please find the available file name from CML as "xrv9k-fullk9-x-7.2.1.qcow2"

RP/0/RP0/CPU0:PCE#show install committed
Thu Jun 24 18:03:23.926 UTC
Node 0/RP0/CPU0 [RP]
Boot Partition: xr_lv0
Committed Packages: 12
xrv9k-xr-7.2.1 version=7.2.1 [Boot image]
xrv9k-isis-2.1.0.0-r721
xrv9k-li-x-1.1.0.0-r721
xrv9k-m2m-2.0.0.0-r721
xrv9k-eigrp-1.0.0.0-r721
xrv9k-mgbl-3.0.0.0-r721
xrv9k-mcast-2.1.0.0-r721
xrv9k-ospf-2.0.0.0-r721
xrv9k-mpls-te-rsvp-3.1.0.0-r721
xrv9k-mpls-2.1.0.0-r721
xrv9k-bng-1.0.0.0-r721
xrv9k-k9sec-3.1.0.0-r721

Node 0/0/CPU0 [LC]
Boot Partition: xr_lcp_lv0
Committed Packages: 12
xrv9k-xr-7.2.1 version=7.2.1 [Boot image]
xrv9k-isis-2.1.0.0-r721
xrv9k-li-x-1.1.0.0-r721
xrv9k-m2m-2.0.0.0-r721
xrv9k-eigrp-1.0.0.0-r721
xrv9k-mgbl-3.0.0.0-r721
xrv9k-mcast-2.1.0.0-r721
xrv9k-ospf-2.0.0.0-r721
xrv9k-mpls-te-rsvp-3.1.0.0-r721
xrv9k-mpls-2.1.0.0-r721
xrv9k-bng-1.0.0.0-r721
xrv9k-k9sec-3.1.0.0-r721

[Harold Ritter]

Hi Mohideen,

It looks good. The issue is somewhere else. Can you please share the PCE configuration.

Regards,

[Mohideen Pitchai]

Hi Harold,

Attached configuration is FYKI.

Thank you

[Mohideen Pitchai]

Hi @Harold Ritter  I am sharing you the "pce_server" process status looks all sleeping.

[Harold Ritter · Accepted solution]

Hi Mohideen,

The issue is due to the fact that you are missing the following configuration under the ospf process on the PCE.

router ospf SR

 distribute link-state

This is why the PCE is not listening on TCP port 4189

Regards,

[Mohideen Pitchai · Accepted solution]

Hi Harold,

Its working now. Thanks for your support to reach towards conclusion.. Much appreciated.

Thanks

Mohideen.

[Harold Ritter]

Hi @Mohideen Pitchai ,

It looks like you might be missing some configuration between the source and destination.

Can you run the following command to verify that:

sh segment-routing traffic-eng cspf ipv4 source <lo0 source for the LSP> destination 1.1.1.1 metric-type igp

Regards,

[Mohideen Pitchai]

Hi Harold,

Please find below output. i have attached my running configuration along with some more output for your kind reference.

R5#show segment-routing traffic-eng cspf ipv4 source 5.5.5.5 destination 1.1.1.1 metric-type igp
No Path Found

CSPF result: Not set (rc=0)

Thanks

Mohideen

[Harold Ritter · Accepted solution]

The issue seems to be due to the fact that your OSPF network type is not point-to-point.

This causes weird information in the segment routing topology database as can be seen here:

Node 1:
TE router ID: 5.5.5.5
OSPF router ID: 5.5.5.5 area ID: 0 domain ID: 115 ASN: 0
Prefix SID:
Prefix 5.5.5.5, label 16005 (regular), domain ID 115, flags: N
Link[0]: local address 10.1.5.5, remote address 10.1.5.1
Local node:
OSPF router ID: 5.5.5.5 area ID: 0 domain ID: 115 ASN: 0
Remote node:
TE router ID: 1.1.1.1
OSPF router ID: 1.1.1.1 area ID: 0 domain ID: 115 ASN: 0
Metric: IGP 0, TE 0, Delay 0
Bandwidth: Total 0, Reservable 0
Admin-groups: 0x00000000
Link[1]: local address 10.1.5.5, remote address 10.1.5.5
Local node:
OSPF router ID: 5.5.5.5 area ID: 0 domain ID: 115 ASN: 0
Remote node:
TE router ID: 5.5.5.5
OSPF router ID: 5.5.5.5 area ID: 0 domain ID: 115 ASN: 0
Metric: IGP 1, TE 1, Delay 1
Bandwidth: Total 125000000, Reservable 0
Admin-groups: 0x00000000
Adj SID: 18 (unprotected)

Although you only have one link between Node 1 and Node 2, the topology database sees 2. 

Can you please set all the transit interface as point-to-point ("ip ospf network point-to-point").

Regards,

[Mohideen Pitchai]

 Hi Harold,

Thats great.. After modifying P2P , the policy came up. Thanks a lot. I am still looking forward your support to overcome on PCEP issue which is keep flapping.

R5#sh segment-routing traffic-eng policy all

Name: SR_TE (Color: 5 End-point: 1.1.1.1)
Owners : CLI
Status:
Admin: up, Operational: up for 01:00:38 (since 06-23 06:28:41.119)
Candidate-paths:
Preference 5 (CLI):
Dynamic (active)
Metric Type: IGP, Path Accumulated Metric: 1
18 [Adjacency-SID, 10.1.5.5 - 10.1.5.1]
Attributes:
Binding SID: 17
Allocation mode: dynamic
State: Programmed

PCEP is keep flapping.

R5#show pce client peer
PCC's peer database:
--------------------

Peer address: 12.12.12.12, Precedence: 10
Client POLICY_MGR
State keep wait
Capabilities: Stateful, Update, Segment-Routing

R5#show pce client peer
PCC's peer database:
--------------------

Peer address: 12.12.12.12, Precedence: 10
Client POLICY_MGR
State idle
Capabilities: Stateful, Update, Segment-Routing

R5#show pce client peer
PCC's peer database:
--------------------

Peer address: 12.12.12.12, Precedence: 10
Client POLICY_MGR
State up
Capabilities: Stateful, Update, Segment-Routing

Thanks

Mohideen.