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Cisco IOS/IOS-XE

Persist SNMP Indexes

Depending on the IOS version of your device, the command to globally enable persistence is:

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snmp-server ifindex persist

or

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snmp ifmib ifindex persist

FDB/VLAN with SNMPv3

Cisco IOS store FDB and VLAN information in context based tables vlan-<num>, for correctly polling this context by SNMPv3 auth, need add match prefix keyword in snmp-server config. I.e.:

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snmp-server group STATS v3 priv match prefix read VIEW-RO

Cisco IOS-XR

Persist SNMP Indexes

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snmp-server ifindex persist
snmp-server entityindex persist

VRF

Observium can monitor BGP peers and other modules (like ip addresses) in VRF, but need configure on device.

  • Create snmp context:
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snmp-server context ctxtA
snmp-server context ctxtB
  • Associate VRFs with contexts:
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snmp-server vrf VRFA
   context ctxtA
snmp-server vrf VRFB
   context ctxtB

Power Supply Sensors

In IOS-XR Power Supply information is considered “admin” restricted information which is therefore only accessible via community-strings/usernames configured with the “SystemOwner” keyword.

  • Example for SNMPv2 community (then poll with “adminCommunity” as community-string):
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snmp-server community adminCommunity RO SystemOwner
  • Example for SNMPv3 auth (then poll with “adminUser” as user):
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snmp-server user adminUser RO v3 auth sha encrypted XXXX priv des56 encrypted YYYY SystemOwner

Cisco Nexus

VRF

Minimum version

This feature available since version 20.10.10795

Observium supports discovery of IP addresses for interfaces in VRF. However, this requires configuring SNMP context mapping as described on these pages: Configuring the Context to Network Entity Mapping

Minimal device configuration example, where VRF management mapped to SNMP context test:

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snmp-server context test vrf management

For see all snmp contexts on device:

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show snmp context

After configure VRF to SNMP context mapping on device, wait for next device(s) discovery or run discovery manully:

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./discovery.php -m vrf,ip-addresses -h <device>

You will see in eventlog messages like this: