Configuring Basic SR-MPLS TE Functions

This section describes how to configure basic SR-MPLS TE functions.

Context

SR-MPLS TE uses strict and loose explicit paths. Strict explicit paths use adjacency SIDs, and loose explicit paths use adjacency and node SIDs. Before an SR-MPLS TE tunnel is configured, the adjacency and node SIDs must be configured.

Procedure

Configure an SRGB range.
1. Run system-view
  The system view is displayed.
2. Run isis [ process-id ]
  The IS-IS view is displayed.
3. Run network-entity net-addr
  A network entity title (NET) is configured.
4. Run cost-style { wide | compatible | wide-compatible }
  The IS-IS wide metric function is enabled.
5. Run traffic-eng [ level-1 | level-2 | level-1-2 ]
  IS-IS TE is enabled.
6. Run segment-routing mpls
  The IS-IS Segment Routing function is enabled.
7. Run segment-routing global-block begin-value end-value [ ignore-conflict ]
  An SRGB range is configured for the current IS-IS instance.
  
  If a label in the SRGB range to be specified is in use, you can select the ignore-conflict parameter to allow configuration delivery. However, the configuration does not take effect until the device is restarted and the label is released. In normal cases, specifying ignore-conflict is not recommended.
8. Run commit
  The configuration is committed.
9. Run quit
  Return to the system view.
Configure an SR prefix SID.
1. Run interface loopback loopback-number
  A loopback interface is created, and the loopback interface view is displayed.
2. Run isis enable [ process-id ]
  The IS-IS interface is enabled.
3. Run ip address ip-address { mask | mask-length }
  The IP address is configured for the loopback interface.
4. Run isis prefix-sid { absolute sid-value | index index-value } [ node-disable ]
  An SR prefix SID is configured for the IP address of the interface.
5. Run commit
  The configuration is committed.
6. Run quit
  Return to the system view.
(Optional) Configure an adjacency SID.
After IS-IS SR is enabled, an adjacency SID is automatically generated. To disable the automatic generation of adjacency SIDs, run the segment-routing auto-adj-sid disable command. The automatically generated adjacency SID may change after a device restart. If an explicit path uses such an adjacency SID and the associated device is restarted, this adjacency SID must be reconfigured. You can also manually configure an adjacency SID to facilitate the use of an explicit path.
1. Run segment-routing
  The Segment Routing view is displayed.
2. Run ipv4 adjacency local-ip-addr local-ip-address remote-ip-addr remote-ip-address sid sid-value
  An adjacency SID is manually set for SR.
3. Run commit
  The configuration is committed.