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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