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Cumulus Linux

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If you are using the current version of Cumulus Linux, the content on this page may not be up to date. The current version of the documentation is available here. If you are redirected to the main page of the user guide, then this page may have been renamed; please search for it there.

Supported MIBs

Below are the MIBs that Cumulus Linux supports, as well as suggested uses for them. The /usr/share/snmp/mibs/Cumulus-Snmp-MIB.txt file defines the overall Cumulus Linux MIB.

MIB Name
 Suggested Uses
BGP4-MIB
OSPFv2-MIB
OSPFv3-MIB
RIPv2-MIB 		You can enable FRR SNMP support to provide support for OSPF-MIB (RFC-1850), OSPFV3-MIB (RFC-5643), and BGP4-MIB (RFC-1657).
CUMULUS-BGPVRF-MIB Provides monitoring for all BGP peer types (unnumbered, IPv4, and IPv6) in all VRFs. /usr/share/snmp/mibs/CUMULUS-BGPVRF-MIB.txt defines this MIB.
CUMULUS-COUNTERS-MIB Discard counters: Cumulus Linux also includes its own counters MIB, defined in /usr/share/snmp/mibs/Cumulus-Counters-MIB.txt. It has the OID .1.3.6.1.4.1.40310.2.
CUMULUS-RESOURCE-QUERY-MIB Cumulus Linux includes its own resource utilization MIB, which is similar to using cl-resource-query. This MIB monitors layer 3 entries by host, route, nexthops, ECMP groups, and layer 2 MAC/BDPU entries. /usr/share/snmp/mibs/Cumulus-Resource-Query-MIB.txt defines this MIB, which has the OID .1.3.6.1.4.1.40310.1.
CUMULUS-SNMP-MIB SNMP counters. For information on exposing CPU and memory information with SNMP, see this knowledge base article.
DISMAN-EVENT-MIB Trap monitoring.
ENTITY-MIB Cumulus Linux supports the temperature sensors, fan sensors, power sensors, and ports from RFC 4133.

Note: The ENTITY-MIB does not show the chassis information in Cumulus Linux.
ENTITY-SENSOR-MIB Physical sensor information (temperature, fan, and power supply) from RFC 3433.
HOST-RESOURCES-MIB Users, storage, interfaces, process info, run parameters.
BRIDGE-MIB
Q-BRIDGE-MIB 		The dot1dBasePortEntry and dot1dBasePortIfIndex tables in the BRIDGE-MIB and dot1qBase, dot1qFdbEntry, dot1qTpFdbEntry, dot1qTpFdbStatus, and dot1qVlanStaticName tables in the Q-BRIDGE-MIB tables. You must uncomment the bridge_pp.py pass_persist script in /etc/snmp/snmpd.conf.
IEEE8023-LAG-MIB Implementation of the IEEE 8023-LAG-MIB includes the dot3adAggTable and dot3adAggPortListTable tables. To enable this, edit /etc/snmp/snmpd.conf and uncomment or add the following lines:
view systemonly included .1.2.840.10006.300.43
pass_persist .1.2.840.10006.300.43 /usr/share/snmp/ieee8023_lag_pp.py
IF-MIB Interface description, type, MTU, speed, MAC, admin, operation status, counters.

Note: Cumulus Linux disables the IF-MIB cache by default. The non-caching code path in the IF-MIB treats 64-bit counters like 32-bit counters (a 64-bit counter rolls over after the value increments to a value that extends beyond 32 bits). To enable the counter to reflect traffic statistics using 64-bit counters, remove the -y option from the SNMPDOPTS line in the /etc/default/snmpd file. The example below first shows the original line, commented out, then the modified line without the -y option:
cumulus@switch:~$ cat /etc/default/snmpd
# SNMPDOPTS='-y -LS 0-4 d -Lf /dev/null -u snmp -g snmp -I -smux -p /run/snmpd.pid'
SNMPDOPTS='-LS 0-4 d -Lf /dev/null -u snmp -g snmp -I -smux -p /run/snmpd.pid
IP-FORWARD-MIB IP routing table.
IP-MIB (includes ICMP) IPv4, IPv4 addresses counters, netmasks.
IPv6-MIB IPv6 counters.
LLDP-MIB Layer 2 neighbor information from lldpd (you need to enable the SNMP subagent in LLDP). You need to start lldpd with the -x option to enable connectivity to snmpd(AgentX).
LM-SENSORS MIB Fan speed, temperature sensor values, voltages. The ENTITY-SENSOR MIB replaces this MIB.
NET-SNMP-AGENT-MIB Agent timers, user, group config.
NET-SNMP-VACM-MIB Agent timers, user, group config.
NOTIFICATION-LOG-MIB Local logging.
SNMP-FRAMEWORK-MIB Users, access.
SNMP-MPD-MIB Users, access.
SNMP-TARGET-MIB SNMP-TARGET-MIB.
SNMP-USER-BASED-SM-MIBS Users, access.
SNMP-VIEW-BASED-ACM-MIB Users, access.
TCP-MIB TCP-related information.
UCD-SNMP-MIB System memory, load, CPU, disk IO.
UDP-MIB UDP-related information.

List All Installed MIBs

Due to licensing restrictions, Cumulus Linux does not install all MIBs. For the MIBs that Cumulus Linux does not install, you must add the “non-free” archive to /etc/apt/sources.list. To see which MIBs are on your switch, run ls /usr/share/snmp/mibs/.

To install more MIBs, install snmp-mibs-downloader, then either remove or comment out the “non-free” repository in /etc/apt/sources.list. Refer to Enable MIB-to-OID Translation.

▼ Installed MIBs

Considerations

The snmpd service might cache SNMP MIB object values for performance reasons and update the values periodically. When you poll SNMP objects, the values returned might not reflect real time status changes for some period of time.

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