Manual Lsp Path Switch - Alcatel-Lucent 7450 Manual

Manual LSP Path Switch

The new path must be first configured in CLI or provided via SNMP. The configure router mpls
path path-name CLI command is used to enter the path.
The command fails if any of the following conditions are satisfied:
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When the command is executed, MPLS performs the following procedures:
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Manual LSP Path Switch
This feature provides a new command to move the path of an LSP from a standby secondary to
another standby secondary.
The base version of the command allows the path of the LSP to move from a standby (or an active
secondary) to another standby of the same priority. If a new standby path with a higher priority or
a primary path comes up after the tools perform command is executed, the path re-evaluation
command runs and the path is moved to the path specified by the outcome of the re-evaluation.
The CLI command for the base version is:
tools perform router mpls switch-path lsp lsp-name path path-name
The sticky version of the command can be used to move from a standby path to any other standby
path regardless of priority. The LSP remains in the specified path until this path goes down or the
user performs the no form of the tools perform command.
The CLI commands for the sticky version are:
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The specified current-path-name of this LSP does not have the adaptive option enabled.
The specified new-path-name value does not correspond to a previously defined path.
The specified new-path-name value exists but is being used by any path of the same LSP,
including this one.
MPLS performs a single MBB attempt to move the LSP path to the new path.
If the MBB is successful, MPLS updates the new path.
→ MPLS writes the corresponding NHLFE in the data path if this path is the current
backup path for the primary.
→ If the current path is the active LSP path, it will update the path, write the new
NHLFE in the data path, which will cause traffic to switch to the new path.
If the MBB is not successful, the path retains it current value.
The update-path MBB has the same priority as the manual re-signal MBB.
7450 ESS MPLS Guide