Cisco Cisco IOS Software Release 12.0(13)S7

The MPLS Safe Label Reuse feature is enabled by default with Cisco IOS Release 12.0(32)SY and later 
releases. The MPLS Safe Label Reuse feature ensures the safe reuse of MPLS labels after a router restart. 

The following sections describe how to disable and reenable the MPLS Safe Label Reuse feature and 
how to change configurable parameters for the feature:

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Perform the following tasks to disable and reenable the MPLS Safe Label Reuse After Router Restart 
feature. 

Perform the following task to disable safe MPLS label reuse after a router restart. You might want to 
disable the MPLS Safe Label Reuse feature if:

You judge your network is not susceptible to unsafe label reuse (for example, because you know that 
neighbor routers always discard the labels learned from a restarting router more quickly than it takes 
the router to restart).

Most or all MPLS labels must be available immediately following a router restart to meet the label 
allocation needs of your network regardless of the risk of temporarily misforwarding MPLS traffic.

You must be using Cisco IOS Release 12.0(32)SY or a later release that supports the MPLS Safe Label 
Reuse After Router Restart feature. 

configure terminal

unsafe