Actually, net-snmp does drop leading zeros. # snmpbulkwalk gw1 ifPhysAddress ... IF-MIB::ifPhysAddress.33 = STRING: 0:0:5e:0:1:1 IF-MIB::ifPhysAddress.34 = STRING: 0:0:0:0:0:0 ...
On Wednesday, 26 March 2025 at 09:28:14 UTC Brian Candler wrote: > I note that the IEEE's official list of assigned OUIs uses capitals (but > not colons). > https://standards-oui.ieee.org/oui/oui.txt > > For SNMP, it boils down to the interpretation of DISPLAY-HINT "1x:" and I > don't see any guidance on rendering hex characters. > > It does say "For all types, when rendering the value, leading zeros are > omitted" which to me suggests that :00: should be rendered as :0: - but > that's a different issue. > > On Wednesday, 26 March 2025 at 09:08:22 UTC Ben Kochie wrote: > >> The only place where I can think of would be in the textual convention >> RFCs. >> >> * https://www.rfc-editor.org/rfc/rfc1213.html >> * https://www.rfc-editor.org/rfc/rfc2579.html >> >> A quick scan doesn't seem to indicate a case preference. >> >> On Wed, Mar 26, 2025 at 9:58 AM 'Brian Candler' via Prometheus Users < >> [email protected]> wrote: >> >>> > Why does SNMP exporter show MAC addresses as uppercase? >>> >>> That's what the code does: >>> >>> https://github.com/prometheus/snmp_exporter/blob/v0.28.0/collector/collector.go#L871-L877 >>> >>> case "PhysAddress48": >>> subOid, indexOids := splitOid(indexOids, 6) >>> parts := make([]string, 6) >>> for i, o := range subOid { >>> * parts[i] = fmt.Sprintf("%02X", o)* >>> } >>> return strings.Join(parts, ":"), subOid, indexOids >>> >>> I don't think there's any standard which says hex MAC addresses should >>> be rendered as uppercase or lowercase, and I've seen both on physical >>> hardware (i.e. switches and routers). >>> >>> On Wednesday, 26 March 2025 at 05:25:28 UTC Elliott Balsley wrote: >>> >>>> I figured out how to change this with relabel_configs so it's just a >>>> curiosity. >>>> >>>> On Tuesday, March 25, 2025 at 6:28:38 PM UTC-7 Elliott Balsley wrote: >>>> >>>> Why does SNMP exporter show MAC addresses as uppercase? For example, >>>> using the default snmp.yml with if_mib module I get this: >>>> >>>> ifPhysAddress{ifAlias="",ifDescr="eth0",ifIndex="2",ifName="eth0",ifPhysAddress="3C:EC:EF:3C:B1:5E"} >>>> >>>> 1 >>>> >>>> Net-snmp tools show these values as lowercase, as does the >>>> snmp-exporter README >>>> <https://github.com/prometheus/snmp_exporter/blob/main/generator/README.md> >>>> : >>>> # PhysAddress48: A 48 bit MAC address, rendered as 00:01:02:03:04:ff. >>>> >>>> If you're wondering why this matters... I'm trying to migrate some SNMP >>>> configs from Telegraf to the Prometheus SNMP Exporter. I have a bunch of >>>> existing data in Prometheus, so I'm hoping to build the configs such that >>>> all my time series continue. Telegraf uses lower-case MACs. >>>> >>>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Prometheus Users" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To view this discussion visit >>> https://groups.google.com/d/msgid/prometheus-users/2b82d181-165c-4c04-b0cf-75acaa4cfa3fn%40googlegroups.com >>> >>> <https://groups.google.com/d/msgid/prometheus-users/2b82d181-165c-4c04-b0cf-75acaa4cfa3fn%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- You received this message because you are subscribed to the Google Groups "Prometheus Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/prometheus-users/7353ce2a-344d-41e1-9a37-30ac0a49ee07n%40googlegroups.com.
