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MTU for 802.1q trunk
this is almost accurate but not
MTU is Maximum Transmission Unit including the Ethernet Encapsulation The data size is determined by MSS or Maximum Segment Size
if you specify MTU 1500 and your application is sending 1500byte chunks of Data then there will be fragmentation.
Today switches support MTU up to 1522 with no configuration required or as we say out of the box.
look into the following to see what support what and how big 
http://www.cisco.com/en/US/products/hw/switches/ps663/products_tech_note09186a00801350c8.shtml
You are correct that TCP/IP Illustrated Vol 1 - By W. Rachard Stevens is a great book
On Wed, Jun 25, 2008 at 6:44 PM, Sadiq Yakasai wrote:
> Hi Bit, > > That MTU of 1500 actually refers to the actual data portion (that is passed > down from the IP to DataLink layer) of the frame and not including the > thernet header. When you add the ethernet header, the frame can reach up to > 1522 Bytes, as this link actually says. > > > http://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a0080094665.shtml#frame2 > > If you have access to Safari, check this book - its an excellent resource > when it comes to these basics: > > TCP/IP Illustrated Vol ! - By W. Rachard Stevens, Chapter 2. > > HTH > Sadiq > > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html > > > > >
— Shiran Guez MCSE CCNP NCE1 CCIE #20572 http://cciep3.blogspot.com http://www.linkedin.com/in/cciep3
