Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) - Manual (Page 624)

600 Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide
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IS-IS shortcuts
5
Configuration tasks
It is recommended that the user performs the configuration tasks in the order listed in Table 102 .
TABLE 102 Configuration tasks for IS-IS shortcuts
Configuration task Default behavior See...
1 Enable IS-IS shortcuts Disabled “Enabling and disabling IS-IS
shortcuts”
2 Optionally enable announce on the LSP Disabled “Enabling IS-IS shortcut
advertisements”
3 When announce is enabled, optionally
configure the announce metric When announce is enabled, the
system uses either the default
metric value of 10, or the
explicitly-configured announce
metric value. “Configuring the announce
metric”
4 Optionally configure the relative metric The default value is zero (0). “Configuring the relative
metric”
After performing the configuration steps listed in Table 102 , the user can observe the IS-IS routes
that use IGP shortcuts. For more information, refer to “Show command support” on page 606.
Enabling and disabling IS-IS shortcuts
To enable IS-IS shortcuts on an LSP tunnel, enter commands such as the following, starting at the
MPLS level of the CLI.
Brocade(config-mpls)# lsp tomu3
Brocade(config-mpls-lsp-tomu3)# shortcuts isis level2
Brocade(config-mpls-lsp-tomu3)# enable
Connecting signaled LSP tomu3
These commands enable IS-IS shortcuts on the tomu3 LSP tunnel.
Syntax: [no] shortcuts isis level1 | level 2
Enter the [no] form of the command to disable IS-IS shortcuts.
The level1 or level2 keyword is required and indicates the level of IS-IS routing enabled on the
device. The levels are:
• level1 – A level1 router routes traffic only within the area that includes the router. To forward
traffic to another area, a level1 router sends the traffic to the nearest level2 router.
• level2 – A level2 router routes traffic between areas within a domain.
NOTE
The IS-IS traffic engineering level must match the shortcut level configuration.
Enabling IS-IS shortcut advertisements
When announce is enabled, the tunnel information is advertised in an IS neighbor TLV, which is
stored in the IS-IS database.