Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) - Manual (Page 351)

Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide 327
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Label withdrawal delay
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Upgrade to R05.5.00
If a system is upgraded to R05.5.00 from a release which does not support the label withdrawal
delay feature, then the newly upgraded system will exhibit new behavior as label withdrawal delay
is enabled by default in R05.5.00.
If a system is upgraded from a release which supports label withdrawal delay, then the newly
upgraded system may exhibit new behavior; as follows:
• If there is no label withdrawal delay configuration, the system will exhibit the default behavior
after the upgrade. This means that the system will change to having label withdrawal delay
enabled.
• If a label withdrawal configuration exists, the label withdrawal delay feature will be enabled.
However, if the value for the timer matches the default (i.e. 60 seconds) then the configuration
line will be removed from the running config.
Downgrade from R05.5.00
If a system running R05.5.00 is downgraded to a release which does not support this feature, the
feature will not be available.
If the system is downgraded to a release which does support this featureless example the 5.4.00c
patch), the behavior is as follows:
• If the configuration has a line for disabling label withdrawal delay (example, the value is set to
0) then the feature will be disabled after the downgrade.
• If there is no label withdrawal delay configuration then the feature will be disabled after the
downgrade.
• If the configuration has a line for enabling label withdrawal delay because, for example, it is set
to a non-default value then the feature will be enabled after the downgrade.
Configuring the label withdrawal delay timer
The label withdrawal delay timer delays sending a label withdrawal message for a FEC to a
neighbor. This feature is enabled by default.
Examples
To set the label withdrawal delay timer to 30 seconds, enter the following command:
Brocade(config-mpls-ldp)# label-withdrawal-delay 30
To restore the label withdrawal delay timer default behavior, when the delay period is already
configured as 30 seconds, enter the following command:
Brocade(config-mpls-ldp)# no label-withdrawal-delay 30
To disable the label withdrawal delay timer, enter the following command:
Brocade(config-mpls-ldp)# label-withdrawal-delay 0
[no] label-withdrawal-delay secs
The secs variable specifies the delay period (in seconds) for the label withdrawal delay timer. The
range is 0 - 300. The default value is 60.
Setting the secs variable to a value in the range 1 - 300, updates the configured value.