Re: Ports vs. Interfaces

Fred Baker <fbaker@acc.com> Wed, 04 August 1993 21:18 UTC

Date: Wed, 4 Aug 93 13:47:25 PDT
Sender: ietf-archive-request@IETF.CNRI.Reston.VA.US
From: Fred Baker <fbaker@acc.com>
Message-Id: <9308042047.AA13949@saffron.acc.com>
To: snmp@psi.com, sommer@conware.de
Subject: Re: Ports vs. Interfaces
Cc: bridge-mib@pa.dec.com

>> looking at a regular bridge, e.g. with two COAX interfaces, you will 
>> have a 'ifNumber' value of 2, a 'dot1dBaseNumPorts' value of 2 and
>> and dot1dBasePortIfIndex pointing at the appropriate interface. Ok.
>> 
>> Looking at a bridge with a X.25 interface you can have several
>> 'logical' connections, each of them assigned to a port. 
>> All 'dot1dBasePortIfIndex' will point to the 'ifIndex' of the X.25
>> interface. That's ok.
>> 
>> When trying to put three serial lines together to build a data highway
>> for WAN communication, there are three interfaces but only one 
>> port. Which interface 'dot1dBasePortIfIndex' should point at?
>> 
>> Any suggestions?

you would use the X.25 interface's ifIndex value, and point the various
dot1dBasePortCircuit OIDs to { x25OperIndex vc-index } (RFC 1382).

Re: Ports vs. Interfaces Fred Baker