You can have an IP address on the main interface as well as the
subinterfaces when trunking. You wouldn't want to do this when using
ISL trunking, but it used to be necessary when using 802.1q. In dot1q,
the native VLAN is not tagged. If you were to create a subinterface for
the native VLAN, the router would not recognize it as such and the trunk
would never work.
The solution is to assign the IP address of your native VLAN on the
main interface, and then use subinterfaces for any subsequent VLANs.
Supposedly, with recent IOS releases this is no longer necessary and
subinterfaces can be used for all VLANs.
HTH,
John
>>> "Michael L. Williams" 9/6/01 4:30:11
PM >>>
Dave, how would this work then? (with Frame) you could assign a DLCI
to the
interface as well as an IP, then assign a DLCI and IP to the
subinterfaces?
What would this accomplish?
FYI: I just read in the BCRAN book today that although you *can* have
an IP
on the main interface and one on the subtinterface, that the
subinterfaces
wouldn't receive their traffic. Can't always believe what you read
tho =)
Mike W.
"MADMAN" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Don't know the orgin of this post but you certainly can have an
> address on the physical and subinterfaces when frame or ATM. Keep
in
> mind though that when you address the physical interface you are by
> default a multipoint interface.
>
> Dave
>
> Sean Knox wrote:
> >
> > Yes, this is correct. Now I am curious what the actual reasoning
is
behind
> > this. Anyone know?
> >
> > Sean
> >
> > ""Jeff Smith"" wrote in message
> > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > > If I remember correctly you cannot have an ip address on the
actual
> > > interface if you have sub-int's with ip's. That true?
> --
> David Madland
> Sr. Network Engineer
> CCIE# 2016
> Qwest Communications Int. Inc.
> [EMAIL PROTECTED]
> 612-664-3367
>
> "Emotion should reflect reason not guide it"
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