
Using Traffic Filters
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1-3
Cha
pter 3 provides protocol-specific information for designing inbound traffic
filters. Cha
pter 6 explains how to use the Configuration Manager to apply inbound
traffic filters.
Outbound Traffic Filters
Outbound traffic filters act on packets that the router forwards to a local area
network (LAN) or wide area network (WAN) through a particular interface. Most
sites use outbound traffic filters to ensure timely delivery of critical data, or to
restrict traffic leaving the local network.
Outbound traffic filters are not based on a routing protocol, as are inbound traffic
filters. When you configure outbound traffic filters, you specify a set of conditions
that apply to the following packet headers:
• Data link control (DLC) header
• IP header
To use outbound traffic filters, you must select Protocol Priority as one of the
configured protocols on an interface. Protocol Priority is enabled by default on
circuits configured with Frame Relay or PPP. Otherwise, you must enable
Protocol Priority the first time you configure outbound traffic filters on an
interface.
Cha
pter 4 provides information for designing outbound traffic filters. Chapter 7
explains how to use the Configuration Manager to enable Protocol Priority and
apply outbound traffic filters.
What Is Protocol Prioritization?
Protocol prioritization is an outbound traffic filter mechanism.
With Protocol Priority enabled on an interface, the router sorts traffic into
prioritized delivery queues (High, Normal, and Low), called
priority queues
.
Priority queues affect the sequence in which data leaves an interface; they do not
affect traffic as it arrives at the router. You use outbound traffic filters to specify
how traffic is sorted into priority queues. By default, all outbound traffic goes to
the Normal queue.
See Cha
pter 2 to learn more about priority queuing and dequeuing.
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