Troubleshooting guide

C-5

ATM and Layer 3 Switch Router Troubleshooting Guide

OL-1969-01

Appendix

LANE Data Frame

The LAN emulation data frame for Ethernet is based on ISO 8802.3/CSMA-CD (IEEE 802.3) and is used

to provide connectivity between ATM attached end systems and LAN attached stations.

Figure C-5 shows the format of the LANE data frame.

Figure C-5 LANE Data Frame Format for IEEE 802.3/Ethernet

The LANE data frame has the following fields:

• LE header—Contains either the LAN emulation client identifier value, the sending client,

or X'0000'.

• Destination address.

• Source address.

• Type information—Logical link control (LLC) data frames whose total length, including the LLC

field and data, but not including padding required to meet minimum data frame length, is less than

1536 (X”0600”). It must be encoded by placing the length value in the type/length field. LLC data

frames longer than the maximum must be encoded by placing the value 0 in the type/length field.

• Information—Encapsulated Ethernet data.

LE header

Destination address

Destination

address

Source address

Source address Type info

Info

(16 to 64 octets)

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