Difference between revisions of "IF-MIB rewrite"
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Starting with net-snmp 5.2 there's a new IF-MIB implementation that covers much more MIB objects (e.g. ifXTable with 64-bit ifHC* counters) than the old instrumentation. This IF-MIB rewrite has initially been provided for Linux only, but has already been ported to others and can easily be ported to more platforms. | Starting with net-snmp 5.2 there's a new IF-MIB implementation that covers much more MIB objects (e.g. ifXTable with 64-bit ifHC* counters) than the old instrumentation. This IF-MIB rewrite has initially been provided for Linux only, but has already been ported to others and can easily be ported to more platforms. | ||
Latest revision as of 15:55, 7 October 2007
Starting with net-snmp 5.2 there's a new IF-MIB implementation that covers much more MIB objects (e.g. ifXTable with 64-bit ifHC* counters) than the old instrumentation. This IF-MIB rewrite has initially been provided for Linux only, but has already been ported to others and can easily be ported to more platforms.
Porting Status
net-snmp 5.2.x (configure --enable-mfd-rewrites) and 5.3.x (by default) support the new IF-MIB implementation for Linux only. net-snmp 5.4 and later also has support for OpenBSD, FreeBSD and Solaris (off by default, need to "./configure --enable-mfd-rewrites", also enables the udp-mib and tcp-mib rewrites for Solaris).
Porting HOWTO
Here's what needs to be done to port the IF-MIB rewrite to a new platform. We're looking for volunteers!
There's really only one pair of files that need to be coded:
agent/mibgroup/if-mib/data_access/interface_XXXX.[ch]
It should contain the following routines:
netsnmp_arch_interface_init netsnmp_arch_interface_index_find netsnmp_arch_interface_container_load
See the routines for Linux for an example.
To see how the old implementation retrieved the relevant data from kernel, refer to
agent/mibgroup/mibII/interfaces.c
and related files.
Discussion
If you're interested, please get in touch with us on the lists and/or IRC.
