H3C Technologies H3C S10500 Series Switches - Manual (Page 111)

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Creating an MPLS TE tunnel with a dynamic
signaling protocol
Dynamic signaling protocol can adapt the path of a TE tunnel to network changes and implement
redundancy, FRR, and other advanced features.
The following describes how to create an MPLS TE tunnel with a dynamic signaling protocol:
• Configure MPLS TE properties for links and advertise them through IGP TE extension to form a TEDB.
• Configure tunnel constraints.
• Use the CSPF algorithm to calculate a preferred path based on the TEDB and tunnel constraints.
• Establish the path by using the signaling protocol RSVP-TE.
NOTE:
To form a TEDB, you must configure the IGP TE extension for the nodes on the network to send TE LSAs. If
the IGP TE extension is not configured, the CR-LSP is created based on IGP routing rather than computed
by CSPF.
Configuration prerequisites
Before you perform the configuration, complete the following tasks:
• Configure static routing or an IGP protocol to ensure all LSRs are reachable.
• Configure basic MPLS.
• Configure basic MPLS TE.
Configuration procedure
Complete the following tasks to configure an MPLS TE tunnel using a dynamic signaling protocol:
Task Remarks
Configuring CSPF Optional
Configuring OSPF TE
Configuring IS-IS TE
Required when CSPF is configured
Choose one depending on the IGP protocol used.
Configuring an MPLS TE explicit path Optional
Configuring MPLS TE tunnel constraints Optional
Establishing an MPLS TE tunnel with RSVP-TE
Optional
By default, RSVP-TE is used for establishing an MPLS
TE tunnel.
Configuring CSPF
With CSPF enabled, a node uses CSPF to calculate the shortest path that satisfies TE requirements.
Follow these steps to configure CSPF:
To do… Use the command... Remarks
Enter system view system-view —