PCEP Segment Routing
This chapter describes segment routing configurations requesting path computation from the PCE server.
Topology
PCEP-SR topology
Configuration
R1
R1#configure terminal | Enter configure mode. |
R1(config)#interface lo | Enter interface mode. |
R1(config-if)#ip address 1.1.1.1/32 secondary | Configure the IP address of the interface. |
R1(config-if)#ip router isis 1 | Make the interface part of the router ISIS 1 instance. |
R1(config-if)# prefix-sid absolute 16001 no php | Configure prefix SID absolute value. |
R1(config-if)#exit | Exit interface mode. |
R1(config)#interface eth1 | Enter interface mode. |
R1(config-if)#ip address 11.1.1.1/24 | Configure the IP address of the interface. |
R1(config-if)#ip router isis 1 | Make the interface part of the router ISIS 1 instance. |
R1(config-if)#isis network point-to-point | ISIS network type as point-to-point |
R1(config-if)#label-switching | Enable label switching. |
R1(config)#interface eth2 | Enter interface mode. |
R1(config-if)#ip address 12.1.1.1/24 | Configure the IP address of the interface. |
R1(config-if)#ip router isis 1 | Make the interface part of the router ISIS 1 instance. |
R1(config-if)#label-switching | Enable label switching. |
R1(config-if)#isis network point-to-point | ISIS network type as point-to-point |
R1(config-if)#exit | Exit interface mode. |
R1(config)#interface eth3 | Enter interface mode. |
R1(config-if)#ip address 20.1.1.1/24 | Configure the IP address of the interface towards PCE |
R1(config-if)#ip router isis 1 | Make the interface part of the router ISIS 1 instance. |
R1(config-if)#label-switching | Enable label switching. |
R1(config-if)#isis network point-to-point | Network type as point-to-point |
R1(config-if)#exit | Exit interface mode. |
R1(config)#router isis 1 | Set the routing process ID . |
R1(config-router)#is-type level-1 | Configure is-type. |
R1(config-router)#distribute bgp-ls | Link State distribution to BGP |
R1(config-router)#metric-style wide level-1 | Configure metric style as wide. |
R1(config-router)# net 49.0001.0000.0000.0011.00 | Configure Network entity title (NET). |
R1(config-router)#mpls traffic-eng router-id 1.1.1.1 | Enable MPLS Traffic Engineering under router process. |
R1(config-router)#mpls traffic-eng level-1 | Enable MPLS Traffic Engineering as level-1. |
R1(config-router)# capability cspf | Enable CSPF capability under ISIS 1 process. |
R1(config-router)# isis segment-routing global block 16000 19999 | SRGB Starting and End Range |
R1(config-router)#segment-routing mpls | Enable segment routing under router process. |
R1(config-router)#exit | Exit router mode. |
R1(config)#segment-routing | Configuring segment-routing |
R1(config-sr)#traffic-engineering | Segment Routing traffic engineering |
R1(config-sr-te)#policy policy-to-R3 | Policy configuration with name 1 |
R1(config-sr-pol)#color 1 end-point 3.3.3.3 | SR-policy color and end-point |
R1(config-sr-pol-cp)#candidate-path 100 | SR policy candidate path |
R1(config-sr-pol-cp)#preference 100 | Candidate Path preference |
R1(config-sr-pol-cp)# dynamic-path pcep | Dynamic path as PCEP |
R1(config-sr-pol-cp)#exit-pol-cp | Exit from SR policy candidate path configuration mode |
R1(config-sr-pol)#pce entity 1 | Assign the PCE entity 1 to the SR policy |
R1(config-sr-pol)#exit-sr-pol | Exit from SR policy configuration mode |
R1(config-sr-te)#exit-te | Exit from traffic engineering configuration mode |
R1(config)# router bgp 100 | Configure router BGP in AS 100 |
R1(config-router)# bgp router-id 1.1.1.1 | router identifier for BGP |
R1(config-router)# neighbor 33.33.33.33 remote-as 100 | Configure neighbor in remote-as 100 |
R1(config-router)# neighbor 33.33.33.33 update-source lo | Configure neighbor with update-source loopback |
R1(config-router)# address-family link-state link-state | Enter link-state Address family mode |
R1(config-router-af)# neighbor 33.33.33.33 activate | Activate PCE neighbor |
R1(config-router-af)# exit-address-family | Exit from Address Family configuration mode |
R1(config-router)#exit | Exit router mode. |
R1(config)# pce configuration 1 | Configure Path Computation Client with entity 1 |
R1(config-pcep)#capability | Enter capabilities submode |
R1(config-pcep-cap)#segment-routing pcep | Segment routing capability for PCE |
R1(config-pcep-cap)# pce instantiation | PCE Initiated LSP Instantiation |
R1(config-pcep-cap)# exit-capability | Exit from PCEP Entity Capability mode |
R1(config-pcep)# update-source 1.1.1.1 | Source of routing updates |
R1(config-pcep)# peer-address ipv4 33.33.33.33 | Configure peer address |
R1(config-pcep)# exit | Exit PCEP mode. |
R2
R2#configure terminal | Enter configure mode. |
R2(config)#interface lo | Enter interface mode. |
R2(config-if)#ip address 2.2.2.2/32 secondary | Configure the IP address of the interface. |
R2(config-if)#ip router isis 1 | Make the interface part of the router ISIS 1 instance. |
R2(config-if)# prefix-sid absolute 16002 no php | Configure prefix SID absolute value. |
R2(config-if)#exit | Exit interface mode. |
R2(config)#interface eth1 | Enter interface mode. |
R2(config-if)#ip address 11.1.1.2/24 | Configure the IP address of the interface. |
R2(config-if)#ip router isis 1 | Make the interface part of the router ISIS 1 instance. |
R2(config-if)#isis network point-to-point | ISIS network type as point-to-point |
R2(config-if)#label-switching | Enable label switching. |
R2(config)#interface eth2 | Enter interface mode. |
R2(config-if)#ip address 6.1.1.1/24 | Configure the IP address of the interface. |
R2(config-if)#ip router isis 1 | Make the interface part of the router ISIS 1 instance. |
R2(config-if)#label-switching | Enable label switching. |
R2(config-if)#isis network point-to-point | ISIS network type as point-to-point |
R2(config-if)#exit | Exit interface mode. |
R2(config)#router isis 1 | Set the routing process ID . |
R2(config-router)#is-type level-1 | Configure is-type. |
R2(config-router)#metric-style wide level-1 | Configure metric style as wide. |
R2(config-router)# net 49.0001.0000.0000.0022.00 | Configure Network entity title (NET). |
R2(config-router)#mpls traffic-eng router-id 2.2.2.2 | Enable MPLS Traffic Engineering under router process. |
R2(config-router)#mpls traffic-eng level-1 | Enable MPLS Traffic Engineering as level-1. |
R2(config-router)# capability cspf | Enable CSPF capability under ISIS 1 process. |
R2(config-router)# isis segment-routing global block 16000 19999 | SRGB Starting and End Range |
R2(config-router)#segment-routing mpls | Enable segment routing under router process. |
R2(config-router)#exit | Exit router mode. |
R3
R3#configure terminal | Enter configure mode. |
R3(config)#interface lo | Enter interface mode. |
R3(config-if)#ip address 3.3.3.3/32 secondary | Configure the IP address of the interface. |
R3(config-if)#ip router isis 1 | Make the interface part of the router ISIS 1 instance. |
R3(config-if)# prefix-sid absolute 16003 no php | Configure prefix SID absolute value. |
R3(config-if)#exit | Exit interface mode. |
R3(config)#interface eth1 | Enter interface mode. |
R3(config-if)#ip address 9.1.1.2/24 | Configure the IP address of the interface. |
R3(config-if)#ip router isis 1 | Make the interface part of the router ISIS 1 instance. |
R3(config-if)#isis network point-to-point | ISIS network type as point-to-point |
R3(config-if)#label-switching | Enable label switching. |
R3(config)#interface eth2 | Enter interface mode. |
R3(config-if)#ip address 6.1.1.2/24 | Configure the IP address of the interface. |
R3(config-if)#ip router isis 1 | Make the interface part of the router ISIS 1 instance. |
R3(config-if)#label-switching | Enable label switching. |
R3(config-if)#isis network point-to-point | ISIS network type as point-to-point |
R3(config-if)#exit | Exit interface mode. |
R3(config)#router isis 1 | Set the routing process ID . |
R3(config-router)#is-type level-1 | Configure is-type. |
R3(config-router)#distribute bgp-ls | Link State distribution to BGP |
R3(config-router)#metric-style wide level-1 | Configure metric style as wide. |
R3(config-router)# net 49.0001.0000.0000.0033.00 | Configure Network entity title (NET). |
R3(config-router)#mpls traffic-eng router-id 3.3.3.3 | Enable MPLS Traffic Engineering under router process. |
R3(config-router)#mpls traffic-eng level-1 | Enable MPLS Traffic Engineering as level-1. |
R3(config-router)# capability cspf | Enable CSPF capability under ISIS 1 process. |
R3(config-router)# isis segment-routing global block 16000 19999 | SRGB Starting and End Range |
R3(config-router)#segment-routing mpls | Enable segment routing under router process. |
R3(config-router)#exit | Exit router mode. |
R3(config)# pce configuration 1 | Configure Path Computation Client |
R3(config-pcep)#capability | Specify capabilities of entity |
R3(config-pcep-cap)#segment-routing pcep | Segment routing for PCE |
R3(config-pcep-cap)# pce instantiation | PCE Initiated LSP Instantiation |
R3(config-pcep-cap)# exit-capability | Exit from PCEP Entity Capability mode |
R3(config-pcep)# update-source 3.3.3.3 | Source of routing updates |
R3(config-pcep)# peer-address ipv4 33.33.33.33 | Configure peer address |
R3(config-pcep)# exit | Exit PCEP mode. |
R4
R4#configure terminal | Enter configure mode. |
R4(config)#interface lo | Enter interface mode. |
R4(config-if)#ip address 4.4.4.4/32 secondary | Configure the IP address of the interface. |
R4(config-if)#ip router isis 1 | Make the interface part of the router ISIS 1 instance. |
R4(config-if)# prefix-sid absolute 16004 no php | Configure prefix sid absolute value. |
R4(config-if)#exit | Exit interface mode. |
R4(config)#interface eth1 | Enter interface mode. |
R4(config-if)#ip address 9.1.1.1/24 | Configure the IP address of the interface. |
R4(config-if)#ip router isis 1 | Make the interface part of the router ISIS 1 instance. |
R4(config-if)#isis network point-to-point | ISIS network type as point-to-point |
R4(config-if)#label-switching | Enable label switching. |
R4(config)#interface eth2 | Enter interface mode. |
R4(config-if)#ip address 12.1.1.2/24 | Configure the IP address of the interface. |
R4(config-if)#ip router isis 1 | Make the interface part of the router ISIS 1 instance. |
R4(config-if)#label-switching | Enable label switching. |
R4(config-if)#isis network point-to-point | ISIS network type as point-to-point |
R4(config-if)#exit | Exit interface mode. |
R4(config)#router isis 1 | Set the routing process ID . |
R4(config-router)#is-type level-1 | Configure is-type. |
R4(config-router)#metric-style wide level-1 | Configure metric style as wide. |
R4(config-router)# net 49.0001.0000.0000.0044.00 | Configure Network entity title (NET). |
R4(config-router)#mpls traffic-eng router-id 4.4.4.4 | Enable MPLS Traffic Engineering under router process. |
R4(config-router)#mpls traffic-eng level-1 | Enable MPLS Traffic Engineering as level-1. |
R4(config-router)# capability cspf | Enable CSPF capability under ISIS 1 process. |
R4(config-router)# isis segment-routing global block 16000 19999 | SRGB Starting and End Range |
R4(config-router)#segment-routing mpls | Enable segment routing under router process. |
R4(config-router)#exit | Exit router mode. |
Validation
R1#show segment-routing policy
Policy-Name Color End-point State Forwarding-Info
policy-to-R3 1 3.3.3.3 UP 16003/eth2
R1#show segment-routing policy detail
Policy-Name: policy-to-R3 Color 1 End-point 3.3.3.3 Tunnel-ID: 1
Admin-Status: UP Oper-Status: UP for 00:07:04
State Transition Count: 1
CSPF Retry Limit: 10 CSPF Retry Interval: 10
PCE Entity ID: 1
Binding SID :
BSID: 25600
Alloc mode: Dynamic
Oper State: Programmed
CP ID: 100, Active
Preference: 100 Path Type: Dynamic(pcep) CP Origin: Local
Segment List:
Total no. of segments: 1
Segment0[LABEL]: Label :16003
Out-if: eth2 Out-label-stack: 16003
Attributes:
Configured:
Affinity:
Metric-type: TE
IP Constraints:
R1# show mpls forwarding-table
Codes: > - installed FTN, * - selected FTN, p - stale FTN,
B - BGP FTN, K - CLI FTN, t - tunnel, P - SR Policy FTN,
L - LDP FTN, R - RSVP-TE FTN, S - SNMP FTN, I - IGP-Shortcut,
U - unknown FTN, O - SR-OSPF FTN, i - SR-ISIS FTN, k - SR-CLI FTN
Code FEC FTN-ID Tunnel-id Pri LSP-Type Out-Label Out-Intf ELC Nexthop
i> 2.2.2.2/32 2 0 Yes LSP_DEFAULT 16002 eth1 No 11.1.1.2
P> 3.3.3.3/32 5 1 Yes LSP_DEFAULT 16003 eth2 No 12.1.1.2
i 3.3.3.3/32 4 0 Yes LSP_DEFAULT 16003 eth2 No 12.1.1.2
i> 4.4.4.4/32 3 0 Yes LSP_DEFAULT 16004 eth2 No 12.1.1.2
i> 33.33.33.33/32 1 0 Yes LSP_DEFAULT 3 eth3 No 20.1.1.2