terminology mixup

Abraham Varricatt <[email protected]>
Newsgroups gmane.network.net-snmp.user
Message-ID <[email protected]>
How does the "network interface" as reported by SNMP relate to the
physical ports on a system ? Is there a one-to-one relation or
something of the sort?

I ask because, running snmpd in VirtualBox, I can see all the
'physical' cards that are connected to the system and one additional
loopback port, which has no physical existence. But, the snmp agents
running on my routers do not report back the same number of physical
ports they have. In fact, they even report back "VLAN" and "BRG"
interfaces too.

I'm confused with this terminology. i.e. interface vs physical port.
Why isn't it a one-to-one relationship?

If anyone can help, or at the least, direct me to some reading
material on the subject, it would be most appreciated.

Perplexed,
Abraham Varricatt

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