Anthony,
I agree with you but have taken this a step further. If you have 802.1Q tagging
applied to interfaces, Standard ports will not know what to do with it because
it is tagged special (unless we are talking vlan aware / hybrid ports, then they
take on both ends of the world in switching.) Therefore the packet drops at a
standard port if not 802.1q aware. Right? Will you will see this as the
mini-giant? If it is aware of the 802.1q tag at each end will you not see the
frame just pass thru the switch and not register the error? Could you have a
code bug on the switch then if you see the pass thru 802.1q tag as an error? I
understand that switches should adjust to different tags so that you do not see
them as errors or have I been given a smoke screen? Could there be a
configuration error in the setup of the switch, ie a combo of the 802.1q and
hybid?
Understand that this is the sort of thing I am still learning for the BCMSN test
in October, so I maybe in the same boat as you are. So please let me know what
you find out.
regards,
Steve Clevenger
Anthony Awatefe wrote:
> Normal Ethernet frames sizes can not exceed 1518 bytes. When 802.1q tagging
> is used frame sizes can increased to a maximum of 1522 bytes. This is known
> as a mini giant, switches have no problem handling these frame types,
> although it my register on the switch as an error.
>
> With ISL Encapsulation the switch identifiies the frame as an ISL frame type
>
> Regards
> Anthony
>
> ----- Original Message -----
> From: "Dove" <[EMAIL PROTECTED]>
> Newsgroups: groupstudy.cisco
> To: <[EMAIL PROTECTED]>
> Sent: Wednesday, September 27, 2000 7:28 AM
> Subject: Question about ISL and 802.1Q encapsulation
>
> > Hi,
> >
> > I have a question about ISL and 802.1Q encapsulation/tagging. As I know,
> ISL
> > will encapsulate a frame with adding 26 bytes to header and 4 bytes to
> > trailer; and 802.1Q will modify the existing header and add 4 bytes to it.
> > My question is: if the frame is already in its maximum size (i.e. 1,518
> > byte), after ISL or 802.1Q encapsulation/tagging, the frame size will be
> > greater than the ethernet maximum size. Will it cut the frame into 2 parts
> > or ignore the frame size checking?
> >
> > Regards.
> > dovelet
> >
> >
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