D-Link DES-3226 Switch Management Module - Page 30

It should be noted that the octet counters in the if Table

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including bit-oriented interfaces. 2. The ifPacketGroup. This group contains those objects applicable to packet-oriented network interfaces. 3. The ifFixedLengthGroup. This group contains the objects applicable not only to character-oriented interfaces, such as RS-232, but also to those subnetwork technologies, such as cell-relay/ATM, which transmit data in fixed length transmission units. As well as the octet counters, there are also a few other counters (e.g., the error counters) which are useful for this type of interface, but are currently defined as being packet-oriented. To accommodate this, the definitions of these counters are generalized to apply to characteroriented interfaces and fixed-length-transmission interfaces. It should be noted that the octet counters in the if Table aggregate octet counts for unicast and non-unicast packets into a single octet counter per direction (received/transmitted). Thus, with the above definition of fixed-length-transmission interfaces, where such interfaces which support non-unicast packets, separate counts of unicast and multicast/broadcast transmissions can only be maintained in a media-specific MIB module. The General Table tells when the IfTable was last changed and when the If Stack was last changed. 26 DES-3226 Management

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26
DES-3226 Management
including bit-oriented interfaces.
2. The ifPacketGroup.
This group contains those objects
applicable to packet-oriented network interfaces.
3. The ifFixedLengthGroup.
This group contains the objects
applicable not only to character-oriented interfaces, such as
RS-232, but also to those subnetwork technologies, such as
cell-relay/ATM, which transmit data in fixed length
transmission units.
As well as the octet counters, there are
also a few other counters (e.g., the error counters) which are
useful for this type of interface, but are currently defined as
being packet-oriented.
To accommodate this, the definitions
of these counters are generalized to apply to character-
oriented interfaces and fixed-length-transmission interfaces.
It should be noted that the octet counters in the if Table
aggregate octet counts for unicast and non-unicast packets
into
a
single
octet
counter
per
direction
(received/transmitted).
Thus, with the above definition of
fixed-length-transmission interfaces, where such interfaces
which support non-unicast packets, separate counts of
unicast and multicast/broadcast transmissions can only be
maintained in a media-specific MIB module.
The General Table tells when the IfTable was last changed and when the If
Stack was last changed.