Net Optics Director Switch User Manual


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Director
36
Understand pending and active lters
To understand the actions of lter commands such as ltercommit,lterdiscard,andlterdelete, it is helpful to
visualize the pending lter list and the CAM that holds the active lters.
The previous section explained how the active lters are stored in a CAM, which can be thought of as list of active
lters. These lters, which are actively running in the device, may be referred to as active, running, or committed.
Pending lters, that is, lters that have been dened using lteraddand lterins commands but not yet committed,
are kept in a pending lter list that shadows the CAM. These lters may be referred to as pending or uncommitted. The
following table shows which lter commands affect the pending lter list and which affect the CAM.
Commands apply to
Pending lter list CAM
lter add
lter del
lter discard
lter ins
lter list
lter sync
commit
lter clear
lter commit
lter running
As can be seen from the table, most of the time you work with the contents of the pending lter list. When you have the
lters set up the way you want them in the pending lter list, a commit or ltercommit command transfers the con-
tents of the pending lter list to the CAM, activating that lter set-up. (Remeber that commit also changes Director's
default conguration, but ltercommit does not.)
A common workow for changing the Director lter conguration might be as follows.
TochangetheDirectorlterconguration:
Pending lter list
Address Filter
CAM
Address Filter
1 n1.1 ip_proto=UDP action=drop
2 n1.1 m.1
Starting stateFigure 39:
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