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
>
>
> **NOTE: New CCNA/CCDA List has been formed. For more information go to
> http://www.groupstudy.com/list/Associates.html
> _________________________________
> UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
> FAQ, list archives, and subscription info: http://www.groupstudy.com
> Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
>
**NOTE: New CCNA/CCDA List has been formed. For more information go to
http://www.groupstudy.com/list/Associates.html
_________________________________
UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
FAQ, list archives, and subscription info: http://www.groupstudy.com
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
