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12 >Changes to eCos sources</TITLE
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65 >Chapter 47. SNMP for <SPAN
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91 NAME="NET-SNMP-ECOS-CHANGES">Changes to eCos sources</H1
93 >Small changes have been made in three areas:</P
100 >Various hardware-specific ethernet drivers.</P
104 >The generic ethernet device driver.</P
108 >The OpenBSD TCP/IP networking package.</P
112 >These changes were made in order to export information about the driver and
113 the network that the SNMP agent must report. The changes were trivial in
114 the case of the network stack, since it was already SNMP-friendly. The
115 generic ethernet device driver was re-organized to have an extensive header
116 file and to add a couple of APIs to extract statistics that the
117 hardware-specific device drivers keep within themselves.</P
119 >There may be a performance hit for recording that data; disabling
120 a config option named something like
123 >CYGDBG_DEVS_ETH_xxxx_xxxx_KEEP_STATISTICS</TT
125 depending on the specific device driver will prevent that.</P
127 >Not all platform ethernet device drivers export complete SNMP statistical
128 information; if the exported information is missing, SNMP will report zero
129 values for such data (in the dot3 MIB).</P
131 >The interface chipset has an ID which is an OID; not all the latest greatest
132 devices are listed in the abailable database, so new chipsets may need to
133 be added to the client MIB, if not defined in those from UCD.</P
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193 >Starting the SNMP Agent</TD