Description

This article discusses how the polling functionality is available if the interface is part of a routing-instance.

Solution

According to Juniper's document on ​ Enabling SNMP Access over Routing Instances ​: 

"To enable SNMP managers in routing instances other than the default routing instance to access SNMP information, include the routing-instance-access statement at the [edit snmp] hierarchy level."
 
Example:

root@device# show snmp                                        
community comm1 {
    routing-instance VR1;
}
routing-instance-access;​

  • All SNMP queries will only receive responses pertaining to that instance only. 

  • All SNMP queries to a particular routing-instance must have the routing-instance name prefixed to the query. 

  • The routing-instance name must be specified under the community configuration. 

 

To poll from on routing-instance:

  snmpwalk -v2c -c VR1@test 10.10.10.1 .
 
or
 
To poll from all routing-instances:

  snmpwalk -v2c -c @test 10.10.10.1 .

 

For example:

{master:0}[edit snmp]
root@device# show
community test {
   routing-instance vrf;
}
routing-instance-access;
 
{master:0}[edit]
root@device# show routing-instances
VR1 {
   instance-type virtual-router;
   interface irb.10;
}
 
 

{master:0}[edit]
root@device# run show route table VR1
 
VR1.inet.0: 2 destinations, 2 routes (2 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
 
10.10.10.0/24     *[Direct/0] 00:20:22
                   > via irb.10
10.10.10.1/32     *[Local/0] 00:20:22
                      Local via irb.10
 
{master:0}[edit]
root@device#
 
{master:0}[edit]
root@device# run show arp vpn VR1 no-resolve
Aug 13 12:52:16
MAC Address      Address        Interface               Flags
AA:BB:CC:DD:EE:FF 10.10.10.2     irb.10 [xe-0/0/0.0]     none
 
{master:0}[edit]
root@device#
 
 
From server:
 
juniper@TCPREPLAY:~$ snmpwalk -v2c -c VR1@test 10.10.10.1 .
iso.0.8802.1.1.1.1.1.1.0 = INTEGER: 0
iso.0.8802.1.1.2.1.1.1.0 = INTEGER: 30
iso.0.8802.1.1.2.1.1.2.0 = INTEGER: 4
iso.0.8802.1.1.2.1.1.3.0 = INTEGER: 2
iso.0.8802.1.1.2.1.1.4.0 = INTEGER: 0
iso.0.8802.1.1.2.1.1.5.0 = INTEGER: 5
iso.0.8802.1.1.2.1.2.1.0 = Timeticks: (0) 0:00:00.00
iso.0.8802.1.1.2.1.2.2.0 = Gauge32: 0
iso.0.8802.1.1.2.1.2.3.0 = Gauge32: 0
iso.0.8802.1.1.2.1.2.4.0 = Gauge32: 0
iso.0.8802.1.1.2.1.2.5.0 = Gauge32: 0
iso.0.8802.1.1.2.1.3.1.0 = INTEGER: 4
iso.3.6.1.2.1.1.1.0 = STRING: "Juniper Networks, Inc. qfx5120-48y-8c Ethernet Switch, kernel JUNOS 23.4R2-S3.9, Build date: 2024-11-19 07:11:46 UTC Copyright (c) 1996-2024 Juniper Networks, Inc."
^C
juniper@TCPREPLAY:~$
 
 
juniper@TCPREPLAY:~$ snmpwalk -v2c -c VR1@test 10.10.10.1 .
iso.0.8802.1.1.1.1.1.1.0 = INTEGER: 0
iso.0.8802.1.1.2.1.1.1.0 = INTEGER: 30
iso.0.8802.1.1.2.1.1.2.0 = INTEGER: 4
iso.0.8802.1.1.2.1.1.3.0 = INTEGER: 2
iso.0.8802.1.1.2.1.1.4.0 = INTEGER: 0
iso.0.8802.1.1.2.1.1.5.0 = INTEGER: 5
iso.0.8802.1.1.2.1.2.1.0 = Timeticks: (0) 0:00:00.00
iso.0.8802.1.1.2.1.2.2.0 = Gauge32: 0
iso.0.8802.1.1.2.1.2.3.0 = Gauge32: 0
iso.0.8802.1.1.2.1.2.4.0 = Gauge32: 0
iso.0.8802.1.1.2.1.2.5.0 = Gauge32: 0
iso.0.8802.1.1.2.1.3.1.0 = INTEGER: 4
iso.0.8802.1.1.2.1.3.4.0 = STRING: "Juniper Networks, Inc. qfx5120-48y-8c Ethernet Switch, kernel JUNOS 23.4R2-S5.8, Build date: 2025-07-18 00:17:19 UTC Copyright (c) 1996-2025 Juniper Networks, Inc."
iso.0.8802.1.1.2.1.3.5.0 = STRING: "("
iso.0.8802.1.1.2.1.3.6.0 = STRING: "("
iso.2.840.10006.300.43.1.3.0 = Timeticks: (8879) 0:01:28.79
iso.3.6.1.2.1.1.1.0 = STRING: "Juniper Networks, Inc. qfx5120-48y-8c Ethernet Switch, kernel JUNOS 23.4R2-S5.8, Build date: 2025-07-18 00:22:06 UTC Copyright (c) 1996-2025 Juniper Networks, Inc."

Modification History

08-19-2025 - Added examples and correcting formatting

Related Information

https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/enabling-snmp-access-over-ri-junos-nm.html

https://www.juniper.net/documentation/us/en/software/junos/network-mgmt/topics/topic-map/configuring-snmp-for-routing-instances.html#id-identifying-a-routing-instance