
Configuring Traffic Filters and Protocol Prioritization
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Figure 6-7. Add User-Defined Field Window
Changing Inbound Traffic Filter Precedence
You can assign as many as 31 inbound traffic filters per protocol to each router
interface. You can assign as many as 127 inbound traffic filters for IP.
As you add filters to an interface, the Configuration Manager numbers them
chronologically (#1, #2, #3, and so on, as shown in F
igure 6-8). The number
determines the filter precedence; lower filter numbers have higher precedence.
If a packet matches two filters, the filter with the highest precedence (lowest
number) applies. For example, if the first filter on the interface (#1) accepts a
packet and the second filter (#2) drops the same packet, filter #1 has precedence
and the interface accepts the packet.
F
igure 6-8 shows how the Filters window displays the filters on an interface. The
first filter listed has the highest precedence.
You should create filters on an interface in order of precedence. However, if you
do not, or if your filtering strategy changes, you can use the Filters window to
rearrange the precedence of existing filters.
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