Command Reference Guide

3Com Router 5000 Family and Router 6000 Family gre checksum ● 43
Command Reference
gre checksum
Purpose Use the gre checksum command to configure the two ends of a tunnel to perform
end-to-end check, verifying the correctness of packets and discard those that do not
pass the verification.
Use the undo gre checksum command to cancel the check.
Syntax gre checksum
undo gre checksum
Parameters None
Default By default, end-to-end check of the two ends of tunnel is disabled.
Example Set up a tunnel between the interface serial 3/0/1 of the router 3Com1 and the
interface serial 2/1/1 of the router 3Com2 and enable checksum on both ends of the
tunnel.
[3Com1-Tunnel3] gre checksum
[3Com2-Tunnel2] gre checksum
View This command can be used in the following views:
■ Tunnel Interface view
Description You may enable or disable checksum at each end of a tunnel as needed. If checksum
is enabled at the local end but not at the opposite end, the local end will perform
checksum on the transmitted packets but not on the received packets. If checksum is
disabled at the local end but enabled at the opposite end, the local end will perform
do the opposite.
Related Command: interface tunnel