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Maniphest T5702

Add ability to set include_ifmib_iface_prefix and ifmib_max_num_ifaces for SNMP
Closed, ResolvedPublicFEATURE REQUEST
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Description

  1. Add the ability to set include_ifmib_iface_prefix for SNMP.
.IP "include_ifmib_iface_prefix PREFIX1 PREFIX2 ..."
Sets the interface name prefixes to include in the IF-MIB data collection.
For servers with a large number of interfaces (ppp, dummy, bridge, etc)
the IF-MIB processing will take a large chunk of CPU for ioctl calls
(on Linux). A set of space separated interface name prefixes will
reduce the CPU load for IF-MIB processing.  For example, configuring
"include_ifmib_iface_prefix eth dummy lo" will include only interfaces
with these prefixes and ignore all others for IF-MIB processing.

https://github.com/net-snmp/net-snmp/blob/0175f031c1bd902bf9fbd5c698298f645f449606/man/snmpd.conf.5.def#L105C1-L112C65

Proposed CLI

set service snmp interface-mib-prefix eth
set service snmp interface-mib-prefix dummy

Or

set service snmp interface-mib prefix eth
set service snmp interface-mib prefix dummy
  1. Another useful option ifmib_max_num_ifaces NUM
.IP "ifmib_max_num_ifaces NUM"
Sets the maximum number of interfaces included in IF-MIB data collection.
For servers with a large number of interfaces (ppp, dummy, bridge, etc)
the IF-MIB processing will take a large chunk of CPU for ioctl calls
(on Linux). Setting a reasonable maximum for the CPU used will
reduce the CPU load for IF-MIB processing.  For example, configuring
"ifmib_max_num_ifaces 500" will include only the first 500 interfaces
based on ifindex and ignore all others for IF-MIB processing.

Proposed CLI:

set service snmp interface-mib max xx

Details

Difficulty level
Unknown (require assessment)
Version
-
Why the issue appeared?
Will be filled on close
Is it a breaking change?
Unspecified (possibly destroys the router)
Issue type
Feature (new functionality)

Event Timeline

Viacheslav created this task.Oct 31 2023, 4:00 PM
Viacheslav added a project: VyOS 1.4 Sagitta.
Viacheslav renamed this task from Add ability to set include_ifmib_iface_prefix for SNMP to Add ability to set include_ifmib_iface_prefix and ifmib_max_num_ifaces for SNMP.Oct 31 2023, 4:15 PM
Viacheslav updated the task description. (Show Details)
Viacheslav changed the task status from Open to In progress.Nov 4 2023, 9:26 AM
Viacheslav claimed this task.
Viacheslav updated the task description. (Show Details)
pasik added a subscriber: pasik.Nov 4 2023, 9:58 AM
Viacheslav added a comment.EditedNov 4 2023, 11:19 AM

PR https://github.com/vyos/vyos-1x/pull/2434

set service snmp community public client '127.0.0.1'
set service snmp mib interface-max '25'
set service snmp mib interface 'eth'
set service snmp mib interface 'bond'
Viacheslav closed this task as Resolved.Nov 8 2023, 8:29 AM
Viacheslav moved this task from Need Triage to Finished on the VyOS 1.5 Circinus board.
Viacheslav moved this task from Need Triage to Finished on the VyOS 1.4 Sagitta board.