Filter Policy Advanced Topics; Match-List For Filter Policies; Filter Policies; Figure 14: Iom/Cpm Filter Policy Using Individual Address Prefixes - Alcatel-Lucent 7450 Configuration Manual

destination policy is modified, then the new destinations policy is copied back the source policy
with overwrite specified).
Entry renumbering allows operator to change relative order of a filter policy entry by changing the
entry Id. Entry renumbering can also be used to move 2 entries closer together or further apart,
thus creating additional entry space for new entries.

Filter Policy Advanced Topics

Match-list for Filter Policies

Figure 14
address prefixes in this example) in one or more filter policies prior to introduction of match list.

Figure 14: IOM/CPM Filter Policy using Individual Address Prefixes

An operator has to create one entry for each address prefix to execute a common action. Each entry
defines a match on a unique address prefix from the list plus any other additional match criteria
and the common action. If the same set of address prefixes needs to be used in another IOM or
CPM filter policy, an operator again needs to create one entry for each address prefix of the list in
those filter policies. Same procedure applies (not shown above) if another action needs to be
performed on the list of the addresses within the same filter policy (when for example specifying
different additional match criteria). This process can introduce large operational overhead,
especially when a list contains many elements or/and needs to be reused multiple times across one
or more filter policies.
Match list for CPM and IOM filter policies are introduced to eliminate above operational
complexity by simplifying the IOM and CPM filter policy management on a list of a match
criterion. Instead of defining multiple filter entries in any given filter, an operator can now group
same type of the matching criteria into a single filter match list, and then use that list as a match
criterion value, thus requiring only single filter policy entry per each unique action. The same
match list can be used in one or more IOM filter policies as well as CPM filter policies.
7450 ESS Router Configuration Guide
depicts an approach to implement logical OR on a list of matching criterion (IPv4
IPv4 Prefix 1
IPv4 Prefix 2
IPv4 Prefix N
Entry K+1
+1: match IPv4 Prefix 1
Entry K+2
: match IPv4 Prefix 2
Entry K+N
match IPv4 Prefix N
CPM Filter

Filter Policies

Entry M+1
match IPv4 Prefix 1
Entry M+2
match IPv4 Prefix 2
Entry M+N
match IPv4 Prefix N
IOM Filters
OSSG729
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