Command Reference Guide

256 ● ppp lcp mru consistent 3Com Router 5000 Family and Router 6000 Family
Command Reference
ppp lcp mru consistent
Purpose Use the ppp lcp mru consistent command to enable PPP LCP to negotiation
maximum receive unit (MRU).
Use the undo ppp lcp mru consistent command to restore the default.
Syntax ppp lcp mru consistent
undo ppp lcp mru consistent
Parameters None
Default By default, PPP LCP does not negotiate MRU; the local end modifies MTU depending
on the remote MRU.
Example Enable PPP LCP to negotiate MRU.
[Router-Serial0/0/0] ppp lcp mru consistent
View This command can be used in the following views:
■ Interface view
Description After PPP LCP is enabled to negotiate MRU, the MRU value carried in the LCP
CONREQ message received from the remote end cannot be less than the MTU value
configured on the local interface. If a smaller MRU value is received, the local end
sends a CONNAK message to the remote end. If the received MRU value is still smaller
after the local end makes a specified number of CONNAK message sending attempts,
the local end sends a CONREJ message to disable MRU negotiation. The MRU
negotiation attempts made by the remote end after that will always fail.
Normally, after PPP LCP negotiation succeeds, the MTU at the local end does not
change as the remote MRU changes.