Avaya Configuring Traffic Filters and Protocol Prioritization Manuel d'utilisateur télécharger pdf (Page 80)

Configuring Traffic Filters and Protocol Prioritization

4-6

Reference Points for User-Deﬁned Criteria

To create a ﬁlter with a user-deﬁned criterion, you specify the offset and length to

a supported reference point in the protocol’s header. This section lists the

Data Link and IP reference points for specifying user-deﬁned outbound trafﬁc

ﬁlter criteria.

Data Link Reference Points

Table 4-3 deﬁnes the Data Link reference points. Figures 4-3 and 4-4 show

examples of where those reference points are located in a packet.

Table 4-3. Data Link Reference Points

Reference Point Deﬁnition

MAC Points to the high-order byte of the destination

address

DATA_LINK Points to the ﬁrst byte after the length/type criteria

DL_HEADER_START Points to the beginning of the header (beginning of

the packet) for PPP and Frame Relay

DL_HEADER_END Points to the ﬁrst byte after DLCI in Frame Relay and

the ﬁrst byte after the protocol ID in PPP

DL_FR_MPE Points to NLPID (Frame Relay only)

DL_SR_START Points to the beginning of the source routing packet,

which is the high-order byte of the destination

address

DL_SR_DATA_LINK Points to the ﬁrst byte after the RIF ﬁeld

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Avaya Configuring Traffic Filters and Protocol Prioritization Manuel d'utilisateur Page 80