[j-nsp] SNMP walk on JunOS from inside a routing instance

[Per Westerlund]

That is default behavior, but you can access other RI's interfaces by explicitly using the RI name. No way to reach all IFs at once via a RI. 

/Per

PS: Excuse my brevity, caused by screen kbd.

> 27 apr. 2016 kl. 17:45 skrev James Bensley <jwbensley at gmail.com>:
> 
> Hi All,
> 
> I am migrating from one Cacti box to another, the new one polls some
> MX boxes inside a routing instance but the old one polls in inet0 in
> no routing instance.
> 
> When I snmpwalk the MX boxes from the new Cacti box I am only returned
> the interfaces which are inside that routing instance the poll comes
> in on. On the old Cacti box SNMP returns all interfaces, including
> those inside all routing instances.
> 
> Does Junos restrict the SNMP output to that which relates to the
> routing instance only, when polling in a routing instance?
> 
> username at mxrouter> show configuration snmp
> community SecretCommunity {
>    authorization read-only;
>    routing-instance SNMP-TEST {
>        clients {
>            10.0.0.0/8;
>        }
>    }
> }
> 
> username at mxrouter> show interfaces terse routing-instance TEST-SNMP
> Interface               Admin Link Proto    Local                 Remote
> vt-0/0/10.1054          up    up   inet
> ge-0/3/7.2012           up    up   inet     172.21.18.53/30
>                                   multiservice
> ge-2/3/7.2013           up    up   inet     172.21.18.57/30
>                                   multiservice
> ae0.2047                up    up   inet     10.254.240.1/24
>                                   multiservice
> lo0.2047                up    up   inet     10.254.242.1        --> 0/0
> 
> 
> [root at cacti ~]#  snmpwalk -v 2c -c TEST-SNMP at SecretCommunity
> 10.254.242.1 .iso | grep ifDesc
> IF-MIB::ifDescr.6 = STRING: lo0
> IF-MIB::ifDescr.556 = STRING: ge-0/3/7
> IF-MIB::ifDescr.571 = STRING: vt-0/0/10
> IF-MIB::ifDescr.581 = STRING: ae0
> IF-MIB::ifDescr.1220 = STRING: lo0.2047
> IF-MIB::ifDescr.1242 = STRING: ae0.2047
> IF-MIB::ifDescr.1342 = STRING: ge-0/3/7.2012
> IF-MIB::ifDescr.1343 = STRING: ge-2/3/7.2013
> IF-MIB::ifDescr.2936 = STRING: ge-2/3/7
> IF-MIB::ifDescr.43020 = STRING: vt-0/0/10.1054
> 
> This example system is on 11.4R6.5, but we have a range of Junos
> versions across MX480s & MX960s and it's the same behaviour for all of
> them.
> 
> Any info and help with getting all interfaces returned when polling
> from within a routing instance would be appreciated.
> 
> Cheers,
> James.
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