PCE(XRV9k) and PCC(XE) configuration

[sachin30720041]

Hello,

I have the following setup.

XRV9k(PCE)----CSR1(PCC)-----CSR2----CSR3

On PCE, I can see CSR1 as a peer.

RP/0/RP0/CPU0:PCE#show pce ipv4 peer
PCE's peer database:
--------------------
Peer address: 2.2.2.2
State: Up
Capabilities: Stateful, Segment-Routing, Update

I have configured a policy(pol1) on PCE. But PCC(XE) does not receive the policy.

PCC#show segment-routing traffic-eng policy all
PCC#

XRV1
-------------
int gi0/0/0/1
ipv4 address 100.10.20.1 255.255.255.0
no sh

int lo0
ip address 1.1.1.1 255.255.255.255

pce
address ipv4 1.1.1.1
segment-routing
traffic-eng
peer ipv4 2.2.2.2
policy pol1
color 100 end-point ipv4 4.4.4.4
candidate-paths
preference 100
dynamic mpls
metric
type igp

int gi0/0/0/1
point-to-point
address-family ipv4 unicast
exit
int lo0
address-family ipv4 unicast
exit

router isis 1
net 49.0001.1111.1111.1111.00
is-type level-1
address-family ipv4 unicast
router-id lo0
metric-style wide
segment-routing mpls
mpls traffic-eng level-1
mpls traffic-eng router-id lo0
exit
int gi0/0/0/1
point-to-point
address-family ipv4 unicast
exit
int lo0
address-family ipv4 unicast
exit
exit

XRV2
-----------------
segment-routing mpls
connected-prefix-sid-map
address-family ipv4
2.2.2.2/32 index 2 range 1
exit-address-family

segment-routing traffic-eng
pcc
pce address 1.1.1.1 source-address 2.2.2.2
exit

int gi1
ip address 100.10.20.2 255.255.255.0
ip router isis 1
no sh

int gi2
ip address 100.20.30.2 255.255.255.0
ip router isis 1
isis network point-to-point
no sh

int lo0
ip address 2.2.2.2 255.255.255.255
ip router isis 1

router isis 1
net 49.0001.2222.2222.2222.00
is-type level-1
metric-style wide
distribute link-state
router-id lo0
segment-routing mpls
mpls traffic-eng level-1
mpls traffic-eng router-id lo0
exit
exit

XRV3
-------------------
segment-routing mpls
connected-prefix-sid-map
address-family ipv4
3.3.3.3/32 index 3 range 1
exit

int gi1
ip address 100.30.40.3 255.255.255.0
no sh
ip router isis 1
isis network point-to-point

int gi2
ip address 100.20.30.3 255.255.255.0
no sh
ip router isis 1
isis network point-to-point

int lo0
ip address 3.3.3.3 255.255.255.255
ip router isis 1

router isis 1
net 49.0001.3333.3333.3333.00
distribute link-state
is-type level-1
router-id lo0
metric-style wide
segment-routing mpls
mpls traffic-eng level-1
mpls traffic-eng router-id lo0
exit

XRV4
-------------
segment-routing mpls
connected-prefix-sid-map
address-family ipv4
4.4.4.4/32 index 4 range 1
exit

int gi1
ip address 100.30.40.4 255.255.255.0
no sh
ip router isis 1
isis network point-to-point

int lo0
ip address 4.4.4.4 255.255.255.255
ip router isis 1
exit

router isis 1
net 49.0001.4444.4444.4444.00
distribute link-state
is-type level-1
router-id lo0
metric-style wide
segment-routing mpls
mpls traffic-eng level-1
mpls traffic-eng router-id lo0
exit

Thanks,

Sachin

[sachin30720041 · Accepted solution]

CSR is different than XR. CSR has to request the PCE for the policy. Following example will work on CSR.

policy polx
color 321 end-point 4.4.4.4
candidate-paths
preference 1001
constraints
segments
dataplane mpls
!
!
dynamic
pcep
metric
type te

[Harold Ritter]

Hi @sachin30720041 ,

This is actually a PCC initiated policy example, where the PCC will request the PCE to calculate the path to the specified end point. The original example you posted is actually for a PCE initiated policy, where the PCE will push a policy to the PCC. 

Regards,

[sachin30720041]

Ok.In case of PCE initiated policy, PCE is not pushing the policy to XE PCC. Am I missing any configuration on PCC or PCE?

Does XE support PCE initiated policy ?

[Harold Ritter · Accepted solution]

Hi @sachin30720041 ,

XE supports PCE initiated policies, but it is not currently supported in the CSR1000v platform.

https://www.cisco.com/c/en/us/td/docs/routers/asr920/configuration/guide/segment-routing/17-1-1/b-segment-routing-17-1-asr920/m-pce-initiated-sr-policy.html

Regards,