Folks,
Does the ifTable cache have the DONT_FREE_BEFORE_LOAD and
DONT_FREE_EXPIRED flags set on purpose? (Reference:
agent/mibgroup/if-mib/ifTable/ifTable_data_access.c:149).
These flags are causing stale VLAN interface entries being reported.
# snmpwalk localhost ifName
IF-MIB::ifName.1 = STRING: eth0
IF-MIB::ifName.2 = STRING: eth1
IF-MIB::ifName.3 = STRING: eth2
IF-MIB::ifName.4 = STRING: eth3
IF-MIB::ifName.5 = STRING: lo
IF-MIB::ifName.6 = STRING: eth4
IF-MIB::ifName.7 = STRING: tunl0
IF-MIB::ifName.8 = STRING: gre0
IF-MIB::ifName.9 = STRING: sit0
IF-MIB::ifName.10 = STRING: ip6tnl0
IF-MIB::ifName.36 = STRING: eth0.100
# vconfig rem eth0.100
Removed VLAN -:eth0.100:-
# sleep 30
# snmpwalk localhost ifName
IF-MIB::ifName.1 = STRING: eth0
IF-MIB::ifName.2 = STRING: eth1
IF-MIB::ifName.3 = STRING: eth2
IF-MIB::ifName.4 = STRING: eth3
IF-MIB::ifName.5 = STRING: lo
IF-MIB::ifName.6 = STRING: eth4
IF-MIB::ifName.7 = STRING: tunl0
IF-MIB::ifName.8 = STRING: gre0
IF-MIB::ifName.9 = STRING: sit0
IF-MIB::ifName.10 = STRING: ip6tnl0
IF-MIB::ifName.36 = STRING: eth0.100 <======= stale entry
Every IFTABLE_CACHE_TIMEOUT seconds, the _cache_load() function is
called and it re-enumerates the interface list (/proc/net/dev on
Linux). However, the _cache_free() function of the ifTable cache does
not ever seem to get called and the stale interface entries seem to
remain. Is there a reason the cache is not invalidated before calling
_cache_load()? Performance comes to mind, but _cache_load() is called
every so often to enumerate the interfaces, so a _cache_free() before is
logical?
If I do not set the NETSNMP_CACHE_DONT_FREE_BEFORE_LOAD flag in
ifTable_container_init(), it works fine.
Many thanks
- Tushar
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