
Using Traffic Filters
1-7
Combine Filters
You can apply as many as 31 inbound and 31 outbound traffic filters on each
router interface.
As you add filters to an interface, the Configuration Manager numbers them
chronologically (rule #1, rule #2, rule #3, and so on). The filter rule number
determines the filter’s precedence. Lower rule numbers have higher precedence;
Filter #1 has the highest precedence. If a packet matches 2 filters, the filter with
the highest precedence (lowest number) applies. You can reorder filters after
creating them to determine the precedence of individual filters.
Components of Traffic Filters
Site Manager creates both inbound and outbound traffic filters from template files
that contain filtering information. These templates consist of three components:
• Criteria
The part of each incoming packet, frame, or datagram header to be examined
• Ranges
Numeric values (usually addresses) to be compared with the contents of
examined packets
• Actions
What happens to packets that match the criteria and ranges specified in a filter
Each filter is associated with a particular router circuit.
Criteria
A filter criterion is the part of a packet, frame, or datagram header to be examined.
You can logically break down any packet into at least three components:
• The Data Link Control (DLC) header. Examples of DLC header types are
— Token Ring (802.5)
— Ethernet V.2 and IEEE 802.3
— FDDI
— PPP and Bay Networks Standard
— Frame Relay
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