Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) - Manual (Page 55)

Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide 31
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RSVP soft preemption
1
Configuring RSVP soft preemption
Soft preemption capability on unprotected adaptive LSPs (which is disabled by default) can be
configured irrespective of its state (enable or disable).
Non-adaptive and/or FRR enabled LSPs cannot be configured with soft preemption capability. In
this scenario, the LSP must be disabled first to configure soft preemption based on the policies,
other changes also may be required, such as removing FRR.
All secondary paths configured on the LSP would be allowed to have soft preemption configured
independently.
The following steps must be followed to configure soft preemption.
1. Configure LSP.
2. Configure LSP as adaptive.
3. Configure primary path, when intended.
4. When FRR is configured, remove the FRR configuration.
5. Configure soft preemption.
6. Configure secondary paths.
7. For each secondary path, where soft preemption is intended to be configured, mark them
adaptive, when already not adaptive, configure SOFT preemption.
8. Enable LSP.
RSVP soft preemption configuration example
Brocade(config-mpls-path-sec)# lsp test
Brocade(config-mpls-lsp-test)# to 10.1.1.100
Brocade(config-mpls-lsp-test)# traffic-eng mean-rate 100
Brocade(config-mpls-lsp-test)# adaptive
Brocade(config-mpls-lsp-test)# soft-preemption
Brocade(config-mpls-lsp-test)# secondary
Brocade(config-mpls-lsp-test)# secondary-path sec
Brocade(config-mpls-lsp-test)# traffic-eng mean-rate 100
Brocade(config-mpls-lsp-test-secpath-sec)# adaptive
Brocade(config-mpls-lsp-test-secpath-sec)# soft-preemption
Brocade(config-mpls-lsp-test-secpath-sec)# enab
Connecting signaled LSP test
Brocade(config-mpls)#
Detailed command information
Soft-preemption
The soft-preemption command enables soft preemption functionality. This command must be used
on both, the primary and secondary paths.
Primary path example
Brocade(config-mpls-lsp-test)# soft-preemption