atTable (1.3.6.1.2.1.3.1
<https://www.alvestrand.no/objectid/1.3.6.1.2.1.3.1.html>) contains atEntry
rows (1.3.6.1.2.1.3.1.1
<https://www.alvestrand.no/objectid/1.3.6.1.2.1.3.1.1.html>), each of which
has three columns, one of which is atIfIndex (1.3.6.1.2.1.3.1.1.1
<https://www.alvestrand.no/objectid/1.3.6.1.2.1.3.1.1.1.html>). The
description of atIfIndex says:
*"The interface on which this entry's equivalence is effective. The
interface identified by a particular value of this index is the same
interface as identified by the same value of ifIndex." *
Therefore, if you're not seeing this, it's probably a problem with your
snmp generator configuration. Can you show your generator.yml, and give an
example of the metrics you are getting?
Aside: atTable is ancient and deprecated since 1991 (MIB-II). If your
device supports one of the newer MIBs like ipNetToMediaTable
(1.3.6.1.2.1.4.22, RFC 1213) or ipNetToPhysicalTable (1.3.6.1.2.1.4.35, RFC
4293), you should use that instead.
Note that these tables contain the MAC addresses of *other* devices on your
network. If you want the MAC address *of the interface itself*, then there
is ifPhysAddress from the ifTable (which is collected with the
out-of-the-box SNMP generator config).
# HELP ifPhysAddress The interface's address at its protocol sub-layer -
1.3.6.1.2.1.2.2.1.6
# TYPE ifPhysAddress gauge
ifPhysAddress{ifAlias="",ifDescr="ether1",ifIndex="1",ifName="ether1",ifPhysAddress="00:5A:FF:1C:79:FD"}
1
On Wednesday, 1 November 2023 at 20:24:39 UTC Tyler Mace wrote:
> I am using a cisco_wlc switch with snmp-exporter.
>
> The SNMP service knows about the connected MAC addresses for each port
> (through it's ARP table). Every other field for network metrics uses
> ifIndex as an index input. But this index doesn't work for the
> atPhysAddress OID. How can I correlate the ifIndex to the atPhysAddress to
> dynamically get MAC addresses?
>
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