The mpls te cspf preferred-igp command specifies a preferred IGP for the CSPF calculation.
The undo mpls te cspf preferred-igp command restores the default settings.
The TEDB generated by OSPF is preferred by default.
mpls te cspf preferred-igp { isis [ isis-process-id [ level-1 | level-2 ] ] | ospf [ ospf-process-id [ area { area-id-1 | area-id-2 } ] ] }
undo mpls te cspf preferred-igp
| Parameter | Description | Value |
|---|---|---|
| isis | Indicates that the TEDB generated by IS-IS is preferred. | - |
| isis-process-id | Specifies the process ID. | The value is an integer that ranges from 1 to 65535. |
| level-1 | Indicates that the TEDB generated by a Level-1 IS-IS device is preferred. | - |
| level-2 | Indicates that the TEDB generated by a Level-2 IS-IS device is preferred. | - |
| ospf | Indicates that the TEDB generated by OSPF is preferred. | - |
| ospf-process-id | Specifies the ID of an OSPF process. | The value is an integer that ranges from 1 to 65535. |
| area area-id-1 | Specifies a preferred OSPF area configured in number format. | The value is an integer that ranges from 0 to 4294967295. |
| area area-id-2 | Specifies a preferred OSPF area configured in IP address format. | The value is in dotted decimal notation. |
Usage Scenario
When selecting a path, CSPF prefers the TEDB generated by OSPF to calculate a CR-LSP by default. When the OSPF TEDB can be used to calculate a path, the IS-IS TEDB is not used. If the calculation based on the OSPF TEDB fails, recalculation based on the IS-IS TEDB is performed.
You can run the mpls te cspf preferred-igp command to configure CSPF to prefer the TEDB generated by IS-IS when calculating a CR-LSR. In this case, the OSPF TEDB is only used to calculate a path when the path calculation based on the IS-IS TEDB fails.
Prerequisites
CSPF has been enabled using the mpls te cspf command.