Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) - Manual (Page 629)

Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide 605
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IS-IS shortcuts
5
• clear isis shortcut lsp lsp-name – This command clears IS-IS shortcuts for the specified LSP.
Syntax: clear isis shortcut [lsp lsp-name]
Ignore LSP metric
The Ignore LSP Metric feature, when enabled, forces IGP protocols not to use configured LSP metric
values for IS-IS and OSPF shortcuts when performing SFP calculations. Enabling this feature
causes the shortcut’s effective metric to be derived by summing up all the path’s cost spanned
over by the shortcut. By ignoring the LSP metric, IGP such as IS-IS, can just run Incremental
Shortcut SPF instead of full SPF calculation when an LSP goes up or down since the network
topology is not changed.
This feature can only be enabled on routers when the IGP shortcut is configured. The feature is
disabled by default.
NOTE
The LSP must be disabled before enabling or disabling this feature.
To enable the Ignore LSP metric feature, disable the LSP and enter a command such as the
following at the MPLS LSP level of the CLI.
For IS-IS:
Brocade(config-mpls-lsp-tomu3)# shortcut isis level2 ignore-lsp-metric
Syntax: [no] shortcut isis level1 | level2 [ignore-lsp-metric] [announce [announce-metric value]]
[relative-metric +|- value]
The “+” or “–” sign is required. “+” denotes a positive number. “–” denotes a negative number.
For num, enter a value from 1 – 16777215. The default is zero (0).
Enter the [no] form of the command to return to using the configured LSP metric as the shortcut’s
cost when performing IS-IS SFP calculation.
For OSPF:
Brocade(config-mpls-lsp-tomu3)# shortcut ospf ignore-lsp-metric
Syntax: [no] shortcut ospf [ignore-lsp-metric]
Enter the [no] form of the command to return to using the configured LSP metric as the shortcut’s
cost when performing OSPF SFP calculation.