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Cell Relay Retreat>List Archive>month:1999-Oct> msg00078



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Re: What's the MTU for ATM network

  • From: kevino@cup.hp.com (Kevin O'Hare)
  • Date: 27 Oct 1999 21:41:40 GMT
  • Organization: SSO-IT, Hewlett-Packard Co.


Paul Koning (pkoning@xedia.com) wrote:
:>Baris Aksoy wrote:
:>> 
:>> First router will terminate FR frames and get the IP packets out. Then,
:>> it'll use segmentation(SAR) functions to put into AAL5 packets(48-bytes)
:>> and then to 53-bytes ATM cell. Then it'll route to ATM network.

:>The standard MTU for ATM is 9180 bytes, i.e., the standard max AAL5
:>packet size when carrying IP traffic is 9188.

The "default" MTU size for CIP (Classical IP) is 9180. Networks will 
support other sizes, as does LANE (LAN Emulation). Check your equipment 
and network vendors, and see what MTU sizes they will support. 
Maintain the same MTU size within your ATM subnetwork. 
--
|Kevin O'Hare                     use:   kevino at cup dot hp dot com |