Configuring Tunnel Re-optimization
Context
Topology and link bandwidth of an IP/MPLS network are changeable. As a result, a path over which an MPLS TE tunnel has been established may not be optimal. Tunnel re-optimization can be configured to allow the MPLS TE tunnel to be reestablished over an optimal path.
Periodic re-optimization: The system attempts to reestablish tunnels over better paths (if there are) at a specified interval configured using the mpls te auto reoptimization command. This implementation prevents manual intervention and reduces configuration workload.
Manual re-optimization: A user configures the system to attempt to reestablish TE tunnels over better paths if there are.
Tunnel re-optimization does not take effect on a tunnel if this tunnel has been established over an explicit path.
Tunnel re-optimization cannot be used on tunnels for which a system selects paths in most-fill tie-breaking mode of CSPF.
Procedure
- Configure periodic re-optimization.
- (Optional) Configure suppression on automatic tunnel re-optimization.
After automatic tunnel re-optimization is enabled, tunnel re-optimization is repeatedly triggered if route flapping occurs, which wastes network resources. To prevent this problem, you can configure suppression on automatic tunnel re-optimization.
Run quit
Return to the system view.
Run mpls
The MPLS view is displayed.
Run mpls te reoptimization link-up disable
Link change-triggered RSVP-TE tunnel re-optimization is disabled.
After this command is configured, tunnels are not automatically re-optimized upon network changes.
This command disables automatic re-optimization for all existing tunnels. If a tunnel is created after you run this command, this command does not take effect on the created tunnel.
If the frequency interval parameter is specified when you configure the mpls te reoptimization (tunnel interface view) command, link change-triggered RSVP-TE tunnel re-optimization does not take effect on the tunnel.
- (Optional) Configure suppression on automatic tunnel re-optimization.
- Configure manual re-optimization. Run the following command in the user view:
mpls te reoptimization [ auto-tunnel name tunnel-interface | tunnel tunnel-number ]
Manual re-optimization is configured.
If the command contains the auto-tunnel name tunnel-interface or tunnel tunnel-number parameter, only the specified tunnel is re-optimized. If this command does not contain any parameter, all the tunnels on the current node are re-optimized.