[j-nsp] SNMP polling a logical-system without encoding it as LS/RI at community

[Zenon Mousmoulas]

Hi,

We have a script that attempts to do network discovery, polling every  
system and then its' neighbors through SNMP, so it's practically based  
on the assumption that the community string remains the same on every  
system it comes across.

Now this script should discover a JUNOS logical system, however,  
according to the documentation, it needs to use a different community  
in order to target specifically that logical system:

http://www.juniper.net/techpubs/software/junos/junos93/swconfig-net-mgmt/routing-instance-identifying-junos-nm.html#id-10865737

This is not very convenient because it breaks the previously stated  
assumption. Is it at all possible to configure snmp so that when the  
logical system is polled on a specific address (e.g. the one assigned  
to its' lo0.<someunit>) it will reply as if the specially encoded  
community had been specified? Is it possible i.e. to identify the  
logical system not through the community but rather through the  
destination address?

I've also tried the suggestion in the next paragraph:

http://www.juniper.net/techpubs/software/junos/junos93/swconfig-net-mgmt/routing-instance-in-snmp-community-specifying-junos-nm.html#routing-instance-in-snmp-community

However it did not make a difference and I'm not really sure how it  
correlates to the above.

Thanks in advance for any hints.

Best regards,
Zenon Mousmoulas
GRNET