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JUNOSe 7.2.x Policy Management Configuration Guide

50 ! Merging Policies

Policy Attachment Rules

The attributes of a policy attachment are as follows:

! Policy name—Name of policy to be attached.

! Attachment type—Type of attachment.

! Statistics enable/disable—Enable or disable statistics for the attachment.

! Baseline enable/disable—Enable or disable baselining for the attachment.

! Merge or Replace—Allow an attachment to become merge-capable and merge

with any other attachments that are merge-capable. If the merge keyword is

not specified, then it replaces any existing attachments with the new

attachment. Merging always preserves statistics.

! Preserve—Preserve statistics from earlier attachment when replacing an

attachment. This keyword is mutually exclusive with merge keyword.

Various possibilities result from a policy attachment at an interface due to the

presence or absence of these keywords. The same rules apply while attaching

policies based on interface profiles provided by Service Manager except as noted.

Attachments made through Interface Configuration mode follow these rules:

! If an attachment is issued with the merge keyword specified:

! Any existing attachment of the same type at the interface without the

merge keyword is replaced by the new attachment, which then becomes

merge-capable.

! An attachment is merged with any existing attachments of the same type

that have the merge keyword set. If a merged policy already exists for the

set of component policies, then this merged policy is used or a new merged

policy is created dynamically and attached. The statistics for common

classifier groups are preserved when replacing the existing merged

attachment.

! If an attachment is issued when no merge or preserve keyword is set, then it

replaces all other attachments with the same type at the interface. This

attachment is not merge-capable for future use and statistics from previous

attachments are not preserved.

! If an attachment is issued when the merge keyword is not set, but the preserve

keyword is set, it replaces all other attachments with the same type at the

interface. This attachment is not merge-capable for future use. Statistics from

existing attachments are preserved for all the common classifier-groups.

! You cannot have multiple attachments of the same policy on a single

attachment point. Only Service Manager executes multiple attachments of the

same policy at the same attachment point.

Juniper E320 User Manual

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