Hong Chen wrote:
> hi folks
>
> I'm trying to enhance our NMS so that it can monitor a Frame Relay
> interface.
>
> After reading RFC2115, I have some questions :
> If a F.R. interface contains more than one sub-interface, for instance,
> serial0 includes two sub-interfaces : serial0.1 and serial0.2, how are these
> interfaces mapped to ifTable and frCircuitTable ?

It may depend on the product you are talking to.

> Does each one ( Serial0, serial0.1 and serial0.2 , respectively ) is
> associated to an entry in ifTable ? in each entry , ifType = 32 , is this
> correct ?

Ah, Cisco IOS. Yes, each subinterface will have its own entry in
ifTable. Beware that not all variables are available. For instance,
errors and discards are not counted for subinterfaces although octets
in/out are.

> Does each one (( Serial0, serial0.1 and serial0.2 , respectively ) is
> associated to an entry in frCircuitTable ? Or only the sub- interfaces (
> serial0.1 and serial0.2 ) will have an entry ?
>
I think there will be an entry in the frCircuitTable for every PVC. An
interface or subinterface may have one (point-to-point) or more
(point-to-multipoint) PVCs associated with it.

> The best bet is to do a snmpwalk against a router, but currently I don't
> have any one to play with.
>
It is indeed.

> thanks in advance
> hong
>
>
Steve

thanks.

My major concern is Cisco, and different version of IOS will have different
behavior. before IOS 10.x, it does not create an entry for a sub-interface,
but later one will do this.

There is not standard talking about this association thing, and this really
depends on specific implementation, which make our lives much more difficult
..

hong


"Steve Horsley" wrote in message
news:bo3cpf$8r9$1@news.freedom2surf.net...
> Hong Chen wrote:
> > hi folks
> >
> > I'm trying to enhance our NMS so that it can monitor a Frame Relay
> > interface.
> >
> > After reading RFC2115, I have some questions :
> > If a F.R. interface contains more than one sub-interface, for instance,
> > serial0 includes two sub-interfaces : serial0.1 and serial0.2, how are
these
> > interfaces mapped to ifTable and frCircuitTable ?
>
> It may depend on the product you are talking to.
>
> > Does each one ( Serial0, serial0.1 and serial0.2 , respectively ) is
> > associated to an entry in ifTable ? in each entry , ifType = 32 , is
this
> > correct ?
>
> Ah, Cisco IOS. Yes, each subinterface will have its own entry in
> ifTable. Beware that not all variables are available. For instance,
> errors and discards are not counted for subinterfaces although octets
> in/out are.
>
> > Does each one (( Serial0, serial0.1 and serial0.2 , respectively ) is
> > associated to an entry in frCircuitTable ? Or only the sub- interfaces (
> > serial0.1 and serial0.2 ) will have an entry ?
> >
> I think there will be an entry in the frCircuitTable for every PVC. An
> interface or subinterface may have one (point-to-point) or more
> (point-to-multipoint) PVCs associated with it.
>
> > The best bet is to do a snmpwalk against a router, but currently I don't
> > have any one to play with.
> >
> It is indeed.
>
> > thanks in advance
> > hong
> >
> >
> Steve
>