This article provides a solution on how to poll information from a SNMPv3 server which is located in a non-default routing-instance.
Topology:
DUT(RI:test1)--------SNMP server
- DUT (router) is connecting to the SNMP server via a routing-instance named test.
- SNMPv3 is configured on the DUT.
- SNMP server is using snmpwalk -v3 command to poll information from the DUT.
In addition to the normal SNMPv3 configuration,, another context-prefix in [snmp v3 access group] hierarchy must be added:
access {
group snmpgroup {
context-prefix test1 { >>> set context-prefix to RI’s name
security-model usm {
security-level authentication {
read-view allmibs;
}
}
}
}
}
Example - SNMP server polling command:
When polling from the SNMPv3 server, the add -n option must be added.with the context of routing-instance's name:
snmpwalk -v3 -u nnmsnmpuser -l AuthNoPriv -a MD5 -A site1 -n test1 15.15.15.1 system
Example - Full Configuration and Output:
SNMPv3 Router configuration:
[edit]
test1@router-re0# show snmp
v3 {
usm {
local-engine {
user nnmsnmpuser {
authentication-md5 {
authentication-key "$ABC123"; ## SECRET-DATA
}
}
}
}
vacm {
security-to-group {
security-model usm {
security-name nnmsnmpuser {
group snmpgroup;
}
}
}
access {
group snmpgroup {
context-prefix test1 {
security-model usm {
security-level authentication {
read-view allmibs;
}
}
}
}
}
}
}
engine-id {
use-default-ip-address;
}
view allmibs {
oid .1.3.6.1 include;
}
routing-instance-access;
Example - SNMP server polling command:
user$ snmpwalk -v3 -u nnmsnmpuser -l AuthNoPriv -a MD5 -A herndon1 -n test1 15.15.15.1 system
SNMPv2-MIB::sysDescr.0 = STRING: Juniper Networks, Inc. mx480 internet router, kernel JUNOS 11.4R2.14 #0: 2012-03-17 16:57:48 UTC user@host1.example.com:/volume/build/junos/11.4/release/11.4R2.14/obj-i386/bsd/kernels/JUNIPER/kernel Build date: 2012-03-17 18:22:46 UTC Copyright
SNMPv2-MIB::sysObjectID.0 = OID: SNMPv2-SMI::enterprises.2636.1.1.1.2.25
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (26109399) 3 days, 0:31:33.99
SNMPv2-MIB::sysContact.0 = STRING:
SNMPv2-MIB::sysName.0 = STRING: test1@router-re0
SNMPv2-MIB::sysLocation.0 = STRING:
SNMPv2-MIB::sysServices.0 = INTEGER: 6
2019-04-13: Fixed formatting.
2020-02-26: minor non-technical edits.