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>Changes to eCos sources</TITLE
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>eCos Reference Manual</TH
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>eCos Reference Manual</TH
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>Chapter 47. SNMP for <SPAN
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>Chapter 47. SNMP for <SPAN
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>eCos</I
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><A
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NAME="NET-SNMP-ECOS-CHANGES">Changes to eCos sources</H1
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NAME="NET-SNMP-ECOS-CHANGES">Changes to eCos sources</H1
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><P
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><P
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>Small changes have been made in three areas:</P
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>Small changes have been made in three areas:</P
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><P
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><P
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TYPE="1"
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><LI
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><P
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><P
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>Various hardware-specific ethernet drivers.</P
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>Various hardware-specific ethernet drivers.</P
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>The generic ethernet device driver.</P
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>The generic ethernet device driver.</P
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>The OpenBSD TCP/IP networking package.</P
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>The OpenBSD TCP/IP networking package.</P
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><P
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><P
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>These changes were made in order to export information about the driver and
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>These changes were made in order to export information about the driver and
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the network that the SNMP agent must report. The changes were trivial in
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the network that the SNMP agent must report. The changes were trivial in
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the case of the network stack, since it was already SNMP-friendly. The
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the case of the network stack, since it was already SNMP-friendly. The
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generic ethernet device driver was re-organized to have an extensive header
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generic ethernet device driver was re-organized to have an extensive header
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file and to add a couple of APIs to extract statistics that the
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file and to add a couple of APIs to extract statistics that the
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hardware-specific device drivers keep within themselves.</P
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hardware-specific device drivers keep within themselves.</P
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><P
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><P
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>There may be a performance hit for recording that data; disabling
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>There may be a performance hit for recording that data; disabling
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a config option named something like
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a config option named something like
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<TT
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<TT
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CLASS="LITERAL"
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CLASS="LITERAL"
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>CYGDBG_DEVS_ETH_xxxx_xxxx_KEEP_STATISTICS</TT
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>CYGDBG_DEVS_ETH_xxxx_xxxx_KEEP_STATISTICS</TT
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>
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>
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depending on the specific device driver will prevent that.</P
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depending on the specific device driver will prevent that.</P
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><P
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><P
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>Not all platform ethernet device drivers export complete SNMP statistical
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>Not all platform ethernet device drivers export complete SNMP statistical
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information; if the exported information is missing, SNMP will report zero
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information; if the exported information is missing, SNMP will report zero
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values for such data (in the dot3 MIB).</P
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values for such data (in the dot3 MIB).</P
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><P
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><P
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>The interface chipset has an ID which is an OID; not all the latest greatest
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>The interface chipset has an ID which is an OID; not all the latest greatest
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devices are listed in the abailable database, so new chipsets may need to
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devices are listed in the abailable database, so new chipsets may need to
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be added to the client MIB, if not defined in those from UCD.</P
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be added to the client MIB, if not defined in those from UCD.</P
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