Avaya Configuring Traffic Filters and Protocol Prioritization Manual do Utilizador descarregar pdf (Página 31)

Using Traffic Filters

1-11

User-Deﬁned Criteria

To apply customized criteria that use ﬁelds that are not represented in a protocol’s

predeﬁned criteria, you can deﬁne a user-deﬁned criterion. You specify its location

within the packet header in terms of three parameters:

• Reference point

Speciﬁes a predeﬁned, known bit position within the packet header

• Offset

Speciﬁes the beginning position of the ﬁltered bit pattern in relation to the

reference point (measured in bits)

• Length

Speciﬁes the total bit length of the ﬁltered pattern

Ranges

For each trafﬁc ﬁlter criterion, you also specify the valid range, a series of target

values appropriate to the criterion. For most criteria, you specify an address range.

There must be at least one target value per criterion. The range can be just one

value, or it can be a set of values.

You enter a minimum and a maximum value to specify the range. (For a range of

only one value, you enter only the minimum value; the Conﬁguration Manager

automatically uses that value for both the minimum and maximum.)

For example, if the ﬁlter criteria is MAC Source Address, you must specify which

addresses you want the ﬁlter to examine. If you specify 0x0000A2000001 as the

minimum range value and 0x0000A2000003 as the maximum range value, the

router checks for packets with a MAC source address between 0x0000A2000001

and 0x0000A2000003, inclusive.

Note: Chapter 5 lists valid range values for common trafﬁc ﬁlter criteria and

explains how to specify some common address ranges.

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Avaya Configuring Traffic Filters and Protocol Prioritization Manual do Utilizador Página 31