Agilent Technologies J3972A User's Guide Page 386

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Protocol Analyzer
Working with Captured Packets
5967–9446 385
Error and Information Packets
The packet decodes window shows when any of a packet’s error or infor-
mation bits are set by displaying E or I in the Summary pane. (See item
in figure 80 on page 382.) The decode for an error or information
packet shows the meaning of the bits that are set.
An E in the margin means the packet contains an error—either a media-
specific error or an SNMP error.
For Ethernet, an I means that the packet’s status is “first,” which indi-
cates the first packet after a known drop (packet loss) by the agent. For
token ring, an I means the first packet after a known drop, the Address
Recognized bit is set, or the Frame Copied bit is set. For all other media
types, an I means the first packet after a known drop.
If both error and information bits are set for the same packet, only an E
is shown in the Summary pane.
Decoding of packets identified with status errors (for example, CRC,
oversize, undersize) may yield unpredictable results, depending on the
degree of data corruption within the packet. To suppress the decoding of
error packets, set the NETM_NO_DECODE_AFTER_MEDIA_ERROR environ-
ment variable to any value (prior to starting the Protocol Analyzer). This
variable is boolean; that is, it takes effect if it exists.
You can filter packets by error/information status, as discussed on
page 369.
See Also “To search for a packet” on page 387.
“To filter by packet status” on page 369.
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