Avaya Configuring Traffic Filters and Protocol Prioritization Manuel d'utilisateur télécharger pdf (Page 136)

Configuring Traffic Filters and Protocol Prioritization

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Traffic filter templates and traffic filters contain the following components:

• Criteria

The portion of the incoming packet, frame, or datagram header to be

examined

• Ranges

Numeric values (often addresses) to be compared with the contents of

examined packets

• Actions

What happens to packets that match the criteria and ranges specified in the

traffic filter

Filter Precedence

To specify a traffic filter’s relative priority among other traffic filters applied to the

IP interface, you assign the traffic filter a precedence value. If you do not

explicitly assign a precedence when you create the traffic filter on the IP interface,

the software automatically assigns a precedence equal to the highest precedence

value plus 1.

For example, if an IP interface has only two traffic filters, one with a precedence

of 2 and the other with a precedence of 3, and you assign a new filter without

explicitly identifying a precedence, the software assigns a precedence of 4 to the

newly added filter. To avoid the need to explicitly assign precedence numbers,

assign the traffic filters to an IP interface in the same order that you want the

software to compare them to each packet.

You can specify a precedence value from 1 through 127. The lower the precedence

value, the higher its priority. Thus, if a filter has a precedence of 1, the software

always processes that filter first for each incoming packet.

The software displays an error message if you attempt to assign a filter to an

interface that already has a maximum number of filters (127), whether or not you

try to explicitly assign a precedence to the new filter.

If an IP interface has fewer than 127 filters, but has a filter with a precedence of

127, the BCC will not allow you to add another filter unless you explicitly assign a

precedence less than or equal to an available precedence.

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Avaya Configuring Traffic Filters and Protocol Prioritization Manuel d'utilisateur Page 136