Avaya Configuring Traffic Filters and Protocol Prioritization Manuel d'utilisateur télécharger pdf (Page 27)

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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Avaya Configuring Traffic Filters and Protocol Prioritization Manuel d'utilisateur Page 27