Hi Robert,
The following patch uses the known_missing flag to make sure that the
transient interfaces that are known to have gone away are not sent in
response to GET* requests. If it is an acceptable solution to the
missing-interfaces-being-displayed-by-snmpwalk, I will post it to
net-snmp.org/patches.
Thanks
- Tushar
Index: net-snmp-5.4/agent/mibgroup/if-mib/ifTable/ifTable_interface.c
===================================================================
--- net-snmp-5.4.orig/agent/mibgroup/if-mib/ifTable/ifTable_interface.c
+++ net-snmp-5.4/agent/mibgroup/if-mib/ifTable/ifTable_interface.c
@@ -997,8 +997,15 @@ _mfd_ifTable_get_values(netsnmp_mib_hand
if (NULL == tri)
continue;
- rc = _ifTable_get_column(rowreq_ctx, requests->requestvb,
- tri->colnum);
+ /* Don't report interfaces for which known_missing flag is set */
+ if (!rowreq_ctx->known_missing)
+ rc = _ifTable_get_column(rowreq_ctx, requests->requestvb,
+ tri->colnum);
+ else {
+ requests->requestvb->type = SNMP_NOSUCHINSTANCE;
+ rc = SNMP_ERR_NOERROR;
+ }
+
if (rc) {
if (MFD_SKIP == rc) {
requests->requestvb->type = SNMP_NOSUCHINSTANCE;
Index: net-snmp-5.4/agent/mibgroup/if-mib/ifXTable/ifXTable_interface.c
===================================================================
--- net-snmp-5.4.orig/agent/mibgroup/if-mib/ifXTable/ifXTable_interface.c
+++ net-snmp-5.4/agent/mibgroup/if-mib/ifXTable/ifXTable_interface.c
@@ -872,8 +872,15 @@ _mfd_ifXTable_get_values(netsnmp_mib_han
if (NULL == tri)
continue;
- rc = _ifXTable_get_column(rowreq_ctx, requests->requestvb,
- tri->colnum);
+ /* Don't report interfaces for which known_missing flag is set */
+ if (!rowreq_ctx->known_missing)
+ rc = _ifXTable_get_column(rowreq_ctx, requests->requestvb,
+ tri->colnum);
+ else {
+ requests->requestvb->type = SNMP_NOSUCHINSTANCE;
+ rc = SNMP_ERR_NOERROR;
+ }
+
if (rc) {
if (MFD_SKIP == rc) {
requests->requestvb->type = SNMP_NOSUCHINSTANCE;
Tushar Gohad wrote:
> Hi Robert,
>
> Looking at the _check_interface_entry_for_updates() function, I realize
> now, how the 'missing' interfaces are handled. Sorry about the
> confusion on the interface status.
>
> For now, I will post a patch that utilizes the known_missing flag so
> that the 'missing' interfaces are not in response to the GET* requests.
>
> Many thanks,
>
> - Tushar
>
>
>
>
> Tushar Gohad wrote:
>> Thanks Robert for the response. I sent a reply few minutes ago when I
>> had not seen this email.
>>
>> I will look closer at the net-snmp ifStatus of the interfaces and see
>> how to use the known_missing flag. IMO, a distinction needs to be
>> made between interfaces that have ifStatus down vs interfaces that are
>> completely removed from the kernel's interface list.
>>
>> Many thanks,
>> - Tushar
>>
>>
>>
>> Robert Story wrote:
>>> On Fri, 13 Mar 2009 12:00:09 -0700 Tushar wrote:
>>> TG> > Is the ifStatus down?
>>> TG> > TG> TG> The interface is not down, but is removed using the
>>> command:
>>>
>>> right.. but I'm asking about the net-snmp ifStatus.
>>>
>>
>>> TG> It is not an issue to keep the entry if the vlan interface is
>>> down. But TG> the entry remains in the cache even after you remove
>>> the vlan TG> interface. How should this situation be handled?
>>>
>>> That's a matter of opinion. Some people, like yourself, might want the
>>> interface and all it's stats to completely disappear. Others might
>>> want it to
>>> remain, so that cumulative stats for a particular interface can be
>>> graphed.
>>>
>>> TG> I see a known_missing flag indicating the interface is not to be
>>> found TG> anymore. That flag seems to be set after I remove the
>>> interface using TG> 'vconfig rem.' It is not set when the vlan
>>> interface is down.
>>>
>>> Right. So, if you would like to come up with a patch that optionally
>>> remove the
>>> interface in that case, it could be considered for a future release.
>>>
>>
>
>
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