filter Packet Status

1.3.6.1.2.1.16.7.1.1.7

The status that is to be matched with the input packet. The only bits relevant to this match algorithm are those that have the corresponding filterPktStatusMask bit equal to one. The following two rules are then applied to every packet: (1) For each relevant bit from the packet status with the corresponding filterPktStatusNotMask bit set to zero, if the bit from the packet status is not equal to the corresponding bit from the filterPktStatus, then the packet will fail this status match. (2) If for every relevant bit from the packet status with the corresponding filterPktStatusNotMask bit set to one, the bit from the packet status is equal to the corresponding bit from the filterPktStatus, then the packet will fail this status match. Any packets that have not failed either of the two matches above have passed this status match. In particular, a zero length status filter will match any packet's status. The value of the packet status is a sum. This sum initially takes the value zero. Then, for each error, E, that has been discovered in this packet, 2 raised to a value representing E is added to the sum. The errors and the bits that represent them are dependent on the media type of the interface that this channel is receiving packets from. The errors defined for a packet captured off of an Ethernet interface are as follows: bit # Error 0 Packet is longer than 1518 octets 1 Packet is shorter than 64 octets 2 Packet experienced a CRC or Alignment error For example, an Ethernet fragment would have a value of 6 (2^1 + 2^2). As this MIB is expanded to new media types, this object will have other media-specific errors defined. For the purposes of this status matching algorithm, if the packet status is longer than this filterPktStatus object, this object is conceptually extended with '0' bits until it reaches the size of the packet status. This object may not be modified if the associated filterStatus object is equal to valid(1).