Juniper JUNOSE SOFTWARE 11.0.X - COMMAND REFERENCE A TO M 1-11-2010 Command Reference Manual page 1127

preserve Preserves existing statistics for any classifier-list that is the same
for both the new and old policy attachments when you attach a new policy
to an interface
disabled Disable collection of policy routing statistics
merge Enables merging of multiple policies to form a single policy
NOTE: The local-input keyword for the ipv6 policy command is deprecated, and
may be completely removed in a future release. The keyword should be removed
from scripts.
You should recreate any local input policies using the ipv6 classifier-list local true
command and attaching the policies using the ipv6 policy secondary-input
command.
Interface Configuration, Profile Configuration
Mode
Setting a Statistics Baseline for Policies
Related Topics
Chapter 10: I Commands
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ipv6 policy