Avaya Configuring Differentiated Services Instrukcja Użytkownika Pobierz pdf (Strona 68)

Configuring Differentiated Services

A-18

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For the filter criteria, the URL string criterion is unique to differentiated services.

For the filter criteria, you can add the following actions:

•Log

•Drop

• Accept

• Set DS Field

• Set DS Police

DS Field

If you add the action Set DS Field, the DS Field window opens (Figure A-9). The

DS field specifies the marking of the DS field in the IP packet header. The range

can be 00000000 to 11111111, which is 0 to 255 expressed in binary form.

Figure A-9. DS Field Window

RFC 2474 defines specific guidelines for configuring the DS field. Six bits of the

DS field are used to select the per-hop behavior of a packet as it travels through

each node. The last two bits of the field are currently unused. The value of these

two bits are ignored by differentiated services-compliant nodes when determining

the per-hop behavior to apply to a packet.

Note:

Log is the only action that you can combine with other actions. For

example, you cannot combine Drop and Set DS Field.

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Avaya Configuring Differentiated Services Instrukcja Użytkownika Strona 68