3Com 4007, Command Reference Manual

Page: 496 / 574

496 C
HAPTER
17: A
PPLE
T
ALK
Layer 2
Switching
Modules
✓
Multilayer
Switching
Modules
appletalk checksum Enables Data Delivery Protocol (DDP) checksum error detection for the
AppleTalk protocol on a Multilayer Switching Module.
Valid Minimum Abbreviation
ap c
Important Considerations
■
The AppleTalk protocol uses checksums to detect errors in data
transmissions. A
checksum totals all data bytes and adds the sum to
the checksum field of the data packet. The receiving station computes
a verification checksum from the incoming data and compares the
new checksum with the value that is sent with the data. If the values
do not match, the transmission contains an error.
■
Disabled
is the preferred setting. Enabling the checksum generation
or verification significantly impacts the router’s performance.
Options
Prompt Description Possible Values [Default]
Checksum
generation
state Whether to enable or disable
generation of checksums for
AppleTalk packets
■
enabled
■
disabled
disabled
(factory
default), or
current value
Checksum
verification
state Whether to enable or disable
verification of checksums for
AppleTalk packets
■
enabled
■
disabled
disabled
(factory
default), or
current value